Chapter 16: Evaluation and Management II: Hospital, Observation, Consultations, Critical Care, and the Emergency Department

"The office visit is one bill. Everything in this chapter is two." — constructed

Overview

Chapter 15 built the machinery: medical decision making across three elements, two of three, time as an alternative, and the definitions that make the scoring reproducible.

This chapter reuses all of it. Since January 1, 2023, hospital, observation, consultation, emergency department, nursing facility, and home services are leveled by the same MDM grid you learned in Chapter 15 — same elements, same definitions of "addressed" and "stable" and "unique test," same two-of-three rule. That is why this chapter can cover six code families in the space Chapter 15 gave to one.

What is genuinely new here is not the scoring. It is the setting.

Five things change the moment a patient crosses into a facility, and each of them generates errors that have no equivalent in the office:

1. A single encounter produces two claims — one from the professional and one from the facility — on different forms, to different departments, with different rules, generating two separate patient balances. Chapter 1's opening question was why did I get two bills, and this is the chapter that answers it structurally.
2. The patient has a status — inpatient or outpatient — that is a formal determination, that changes which part of Medicare pays, and that patients almost never know about even though it can cost them thousands.
3. More than one professional bills for the same day, and the rules about who reports what are specific.
4. One code family — consultations — is recognized by some payers and not by others, which means the correct code depends on who is paying.
5. The emergency department has no new-versus-established distinction and no time-based option, and its facility level is determined by criteria that have nothing to do with the physician's.

In this chapter, you will learn to:

• Say why the hospital is a different coding problem
• Choose initial versus subsequent care
• Tell observation from inpatient status and apply the two-midnight benchmark
• Report discharge day management
• Apply the three requirements of a consultation, and know who still pays for them
• Level an emergency department visit
• Report critical care time and name what is bundled into it
• Select nursing facility and home services
• Explain the two-claim structure to a patient without making it worse

And you will run the Encounter's counterfactual. §16.10 puts Account 10-4471's patient, and the same knee, in the emergency department on a Sunday, and follows the money.

16.1 Why the hospital is a different coding problem

In the office, one encounter produces one claim. The practice owns the building, employs the staff, owns the equipment, and pays the physician. Everything is inside one entity and one bill.

In a facility, the same encounter is two economic events, because two entities did two things.

The professional claim reports what the physician or other qualified health care professional did — the cognitive work, the procedure, the interpretation. It goes out on a CMS-1500 as an 837P.

The facility claim reports what the institution provided — the room, the nursing, the supplies, the equipment, the technicians, the overhead. It goes out on a UB-04 as an 837I.

Chapter 3 §3.2 introduced the two forms and Chapter 24 covers them in detail. What matters here is the consequence.

Consequence one: two claims, two adjudications, two remittances, two patient balances. They arrive at different times, from different billing offices, with different reference numbers, and neither one mentions the other. A patient who received one service receives two bills and has no way to tell that they are related.

Consequence two: they can disagree. The professional claim and the facility claim are coded by different people, under different rules, from the same medical record. An emergency department visit can be a 99283 professionally and a 99284 institutionally, and both can be correct — §16.9.

Consequence three: the money is not where people think it is. In the ED anchor from Chapter 1 (Accounts 22-7788 and 10-7789), the total allowed amount was \$1,515.00, of which the emergency physician's share was \$318.60. The facility received about four and a half times what the physician did, for the same visit.

That is not a scandal; it reflects that the institution supplied a staffed emergency department twenty-four hours a day and the physician supplied ninety minutes. But it explains something patients find incomprehensible, and it explains why a billing office that only understands the professional side understands about a fifth of the transaction.

📞 On the Phone

"I only saw one doctor. Why do I have two bills?"

This is the most common patient billing question in American health care and it deserves a good answer rather than a defensive one.

What works: "You received one visit, but two different organizations provided part of it. The physician bill covers the doctor's own work. The hospital bill covers the room, the nursing staff, the supplies, and the equipment. They're billed separately because they're separate businesses, even though you saw them in the same building. Both went to your insurance, and your plan applied your benefits to each one separately."

What does not work: "That's just how it works." It is true, it is useless, and it confirms the caller's suspicion that nobody understands the bill they were sent.

Two things to check before the call ends. Whether both claims actually went to the plan — one of the two failing to file is common and the patient will be the first to notice, though they will describe it as "you billed me twice." And whether the amounts on the statement match the plan's remittance, because a statement issued before the remittance posts will show a number the patient does not owe. Chapter 32 §32.6 covers statement timing, and this is the failure it exists to prevent.

16.2 Initial and subsequent inpatient or observation care

The 2023 change first, because it removed an entire code family.

Before 2023, observation care had its own codes, separate from inpatient care. They were merged. There is now one set of codes for hospital inpatient or observation care, and you select from it without regard to which status the patient is in.

All are leveled by MDM or by total time, using Chapter 15's framework.

What makes a service "initial"

Initial means the first face-to-face service of the stay by that professional — or by another professional of the same specialty in the same group.

Same test as Chapter 15's new-versus-established, applied to a stay instead of to three years. Two cardiologists in the same group: the first bills initial care, the second bills subsequent care. A cardiologist and a nephrologist: each bills an initial service, because they are different specialties.

And "initial" is not the same as "the admission." A consultant who first sees the patient on hospital day four reports an initial service — their first — even though the admission was days earlier.

⚠️ Where Claims Die

Two professionals in the same group and specialty both reporting initial care for the same stay.

It happens on every weekend handoff in the country: the admitting hospitalist bills initial care on Saturday, the partner covering Sunday bills initial care again because their system shows no prior service by them.

The second claim denies as a duplicate or as an unbundled service, and the denial is correct.

The fix is not a coder's. It is a workflow question — does the covering professional know the patient was already seen by the group? — and it is the sort of thing that generates a small, steady stream of denials that nobody ever traces to a cause, because each one individually looks like an ordinary duplicate. Chapter 29 §29.4's denial-classification discipline is what turns twelve unrelated-looking denials into one fixable process.

Selecting the level

By MDM or by time, exactly as in Chapter 15 — and unlike the emergency department, the hospital families do have a time option.

These are stated as single thresholds rather than ranges — the time that must be met or exceeded on the date. That is a structural difference from the office families in Chapter 15 §15.8, where each level occupies a range, and it trips coders who move between settings.

The prolonged services code that attaches to these families is a different code from the office one, and — as in Chapter 15 §15.9 — Medicare's threshold and Medicare's code differ from CPT's. Verify by payer.

And the definition of countable time is unchanged: the reporting professional's own time on that calendar date, excluding staff time and excluding separately reported procedures. The hospital setting does not relax it. Time spent by a resident, by a nurse, or by anyone other than the reporting professional is not the reporting professional's time.

The same-date rule that catches everyone

When the same professional provides an office visit, an emergency department visit, or another outpatient service on the same date as the admission, all of that work rolls into the initial hospital inpatient or observation care code.

One code for the date, not two. The office visit that led to the admission is not separately reported by the admitting physician; the work is folded into the initial care service, and it may raise the level of that service.

The rule is about the same professional. A different physician — the emergency physician who saw the patient before the hospitalist admitted them — reports their own service normally, because they are not the one reporting the initial hospital care.

⚠️ Where Claims Die

An office visit and an initial hospital care service, same physician, same date, both billed.

It is one of the most common professional-side denials in hospital medicine, and it happens because the two services were entered in two different systems — the practice's, and the hospital rounding application — with nothing joining them.

The denial is correct. The office visit is not separately payable and the work belongs in the admission code.

The organizational fix is a charge-reconciliation step, not a coder catching it, because a coder looking at one claim in one system has no way to see the other. Chapter 6 §6.6's charge capture discussion covers this and it is the chapter's least glamorous and most valuable point.

Admission and discharge on the same date

99234–99236 exist for the case where a patient is admitted and discharged on the same calendar date. They replace what would otherwise be an initial service plus a discharge service, and they may not be reported alongside either.

Payers frequently impose a minimum stay duration — commonly stated in hours — before these codes may be used, and require documentation of both the admission and the discharge. Check the payer's policy; this is one of the more variable rules in the E/M set.

Where the stay crosses midnight, it is not a same-date service at all — it is an initial care service on the first date and a discharge on the second, which is a different and generally larger total. The calendar date is what governs, not the number of hours.

16.3 Observation, inpatient status, and the two-midnight benchmark

This section is not really about coding. It is about a determination that happens before coding, that almost nobody explains to the patient, and that can cost that patient more than the hospital stay.

Inpatient and observation are not descriptions of how sick a patient is or where they sleep. They are billing statuses, formally determined, and a patient in an observation bed on a regular hospital floor receiving identical nursing care may be either one.

Observation is an OUTPATIENT service. That single sentence is the source of nearly all the downstream consequences, and it surprises everyone who hears it for the first time — including many patients who spent three nights in a hospital bed.

The two-midnight benchmark

CMS's benchmark, in substance:

If the admitting physician expects the patient to require hospital care spanning at least two midnights, inpatient admission is generally appropriate. If not, the services are generally outpatient — observation.

It is a benchmark based on expectation at the time of the decision, not a rule applied in hindsight. A patient who was reasonably expected to need three days and unexpectedly improved overnight was still appropriately admitted, provided the expectation and its basis were documented.

Which means the documentation of the expectation is the whole thing. A physician who writes "admit" has documented a decision. A physician who writes "admit; anticipate at least two midnights for intravenous antibiotics and monitoring of renal function" has documented a decision and the reasoning that makes it defensible.

Why anyone should care

Which part of Medicare pays. Inpatient care is generally Part A. Outpatient care, including observation, is generally Part B. Chapter 3 §3.4 established the difference, and the patient's cost-sharing is different under each.

Self-administered drugs. Under outpatient status, medications the patient takes themselves are frequently not covered, and the patient is billed for them — sometimes for their own home medications, at hospital pricing. Patients find this outrageous and they are not wrong to.

And the one that does the most damage: the skilled nursing facility three-day rule. Medicare's coverage of a subsequent skilled nursing facility stay has generally required a qualifying inpatient stay of at least three consecutive days.

Observation days do not count toward it.

A patient can spend four nights in a hospital bed, be discharged to a skilled nursing facility, and discover that Medicare will not pay for it — because all four nights were observation, and observation is outpatient, and outpatient days do not qualify.

Hospitals are required to give Medicare patients a written and oral notice explaining that they are receiving observation services as an outpatient and what that may mean for them. That notice exists because of exactly the scenario above, and a coder or patient financial counselor who understands it can prevent a genuinely catastrophic surprise.

Changing status

Condition Code 44 is the mechanism for changing an inpatient admission to outpatient status before the patient is discharged, when a utilization review determination finds inpatient status was not appropriate. It has specific requirements — the determination must be made before discharge, with physician concurrence, and documented.

After discharge, Condition Code 44 is unavailable and a different self-audit process applies. This matters because the deadline is a real one and the window closes quietly.

⚖️ Compliance Check

Status determination is a documented enforcement priority, and it runs in both directions.

Billing an inpatient stay that should have been observation is an overpayment, because inpatient generally pays more. That is the direction enforcement attention has historically focused on.

The reverse is also a real harm, and it falls on the patient rather than the payer: a stay that should have been inpatient, billed as observation, exposes the patient to self-administered drug charges and forfeits their skilled nursing facility qualification. The organization loses money and the patient loses more.

A coder does not make this determination. Utilization review does, with physician involvement. What a coder can do is notice when the documentation does not support the status on the account and route it — which is a real contribution and is frequently the last chance anyone has to catch it before the claim goes out.

16.4 Discharge day management

99238 — hospital inpatient or observation discharge day management, 30 minutes or less 99239 — more than 30 minutes

Straightforward codes with four rules that generate almost all the errors.

It is time-based, and the time is the total for the day. Not continuous time, not face-to-face time only. Final examination, discussion of the stay, instructions to the patient and caregivers, preparation of discharge records, prescriptions, and referral forms — all of it, aggregated.

99239 requires documentation of the time. "More than 30 minutes" is a claim about duration, and a note that does not state the time does not support it. This is the most common discharge day denial, and it is fixed by one sentence.

Only one discharge day management service is reported per stay, by the professional who performed the discharge — the attending. A consultant seeing the patient on the same day reports a subsequent care service, not a discharge.

It is reported for the date of the actual discharge, even when the physician's discharge work occurred on an earlier date.

And it may not be reported with 99234–99236, which already include both the admission and the discharge.

📋 Read the Chart

Source: discharge summary, closing paragraph Encounter: hospital discharge, day 4 What it says:

"Patient examined this morning, afebrile, ambulating. Discharge instructions reviewed with the patient and her daughter, including medication changes and warning signs. Prescriptions sent. Follow-up arranged with primary care in five days and with pulmonology in three weeks. Discharge summary dictated. Total discharge day time: 45 minutes."

What it means: 99239. The final sentence is what makes it 99239 rather than 99238, and it is the sentence most discharge summaries do not have.

What to do about it: report 99239. And notice what would happen without that one sentence — everything else in the paragraph describes work consistent with more than thirty minutes, and none of it states more than thirty minutes. A reviewer does not estimate. Absent the statement, the service is a 99238.

Where it appears: on every discharge, every day, in every hospital. The difference between the practices that report 99239 correctly and the ones that do not is a template field, and Chapter 38 §38.1 is about installing it.

16.4a Concurrent care: several professionals, one patient, one day

The office almost never raises this question. The hospital raises it daily.

A hospitalized patient is frequently seen by several professionals on the same date — an attending hospitalist, a cardiologist, a nephrologist, a surgeon. Each of them may report a service, and each of their claims lands at the same payer, for the same patient, on the same date, in the same code range.

Concurrent care is the provision of similar services to the same patient by more than one professional on the same day. It is permissible. What it requires is that each professional's service be reasonable and necessary and that the record show what each of them was managing.

The payer's question is not "why were there four claims." It is "what was each of them for."

Two things make concurrent care claims survive:

Different specialties, visibly different problems. The cardiologist's note addresses the heart failure; the nephrologist's addresses the kidney; the hospitalist's coordinates. Each note stands on its own problems, its own data, and its own decisions. Where three notes address the same problem in similar language, two of them will be denied and the denial will be defensible.

Diagnosis pointers that reflect the difference. Chapter 25 §25.5 covers diagnosis pointers on the CMS-1500. In concurrent care they do real work: the cardiologist pointing to the cardiac diagnosis and the nephrologist to the renal one is the fastest signal a payer's system has that these are distinct services.

And one thing that reliably kills them: copied notes. When a consultant's daily note reproduces the hospitalist's assessment — which happens constantly in shared electronic records — the two claims become indistinguishable, and a reviewer reading both will conclude, correctly, that they cannot tell what the second professional contributed. Chapter 15 §15.12's sixth characteristic is not a stylistic preference. In the hospital it is the difference between two paid claims and one.

⚖️ Compliance Check

The specialty enrollment question sits underneath all of this and coders rarely see it.

Whether two professionals are "the same specialty" for the initial-versus-subsequent test, and for concurrent care, is determined by how they are enrolled with the payer — not by what they actually practice and not by what the group calls them.

A physician who practices as a hospitalist but is enrolled under internal medicine, working alongside an internist, will be treated as the same specialty by the payer's system whatever the group's internal structure says.

A steady trickle of unexplained duplicate denials in a hospital-based group is very often an enrollment problem wearing a coding costume. Chapter 25 §25.7 covers the identifiers it surfaces through, and this is the specific symptom that should send a coder there rather than into the coding guidelines.

16.5 Consultations: who still pays for them and what makes one

Consultations are the one E/M family where the correct code depends on who is paying, and that makes them worth understanding precisely even though many coders never report them.

The codes

Both families lost their lowest level in the 2023 revision, for the same reason 99201 was deleted in 2021 — with history and examination out of level selection, the bottom level had nothing to distinguish it.

The payer problem

Medicare has not recognized consultation codes since 2010.

For Medicare, the professional reports the appropriate E/M code for the setting and the service level instead — an office visit code in the office, an initial or subsequent hospital care code in the hospital. Several other payers have followed, and others have not.

So the same clinical service is reported one way for one payer and another way for another, which is not a loophole and not a trick. It is two different payers with two different policies, and the coder's job is to know which is which.

What actually makes a consultation

Three requirements, universally taught as the three Rs:

REQUEST. Another physician or appropriate source requested the opinion or advice, and the request is documented in the medical record.

RENDER. The consultant performed the service and rendered an opinion.

REPORT. The consultant communicated the findings back in writing to the requesting professional.

All three, documented. The request and the written report are the two that fail. A patient who self-refers is not a consultation. A specialist who sees a patient, treats them, and never writes back has not performed a consultation regardless of how the visit was scheduled.

Consultation versus transfer of care

The distinction that decides most audits:

A consultation is a request for an opinion. The requesting professional retains responsibility.

A transfer of care hands over responsibility for management of the problem. It is not a consultation, and the receiving professional reports an ordinary E/M service.

A consultant may initiate treatment and it is still a consultation — that is explicitly permitted. What ends it is the transfer of responsibility, not the act of prescribing.

🎓 Exam Watch

The three Rs are on every certification exam, usually as a scenario missing exactly one of them. Read for the missing one:

• No documented request → not a consultation
• No written report back → not a consultation
• Patient self-referred → not a consultation
• Requesting physician transferred management of the problem → transfer of care, not a consultation
• Consultant initiated treatment → still a consultation, if the three Rs are met

And the payer question: Medicare, report the setting-appropriate E/M instead. Exams ask this directly.

16.6 Emergency department levels and why there is no new/established distinction

99281–99285. Five levels. And two structural facts that make this family unlike every other one in this chapter.

There is no new-versus-established distinction, and there is no time-based selection option.

No new/established, because an emergency department is available to anyone at any hour and does not have patients in the ongoing sense. Whether this person was here last month does not change what the department is doing for them tonight.

No time option, because emergency department work is interleaved by design. A physician manages several patients at once, is interrupted continuously, and returns. Total time on the date of the encounter is not a meaningful measure of a single ED patient's care, so the family is leveled on medical decision making only — Chapter 15's grid, all three elements, two of three.

99281 is the outlier within the family, describing a level that may not require the presence of a physician or other qualified health care professional — the ED family's analogue to 99211.

Two things ED coding is famous for

The problems element does the work. A large share of ED patients arrive with an undiagnosed problem of uncertain prognosis or an acute illness with systemic symptoms, both of which are moderate on Chapter 15's grid without any chronic conditions. ED MDM is frequently moderate or high on the problems element alone, and the data and risk elements decide the level from there.

The presenting problem is not the diagnosis, and the diagnosis is not the level. A patient with chest pain who turns out to have indigestion generated a high-risk workup. The MDM reflects the work the presentation required, not what it turned out to be. This is one of the few places where the final diagnosis genuinely understates the service — and it is why ED documentation should state what was being ruled out.

📋 Read the Chart

Source: emergency department note, medical decision making section Encounter: ED visit, chest pain What it says:

"Differential included acute coronary syndrome, pulmonary embolism, and gastroesophageal reflux. Serial troponins and ECG obtained; PE considered and Wells score low, D-dimer not indicated. Discussed admission for observation; patient's presentation, negative serial markers, and reassuring ECG support discharge with next-day follow-up. Return precautions given and understood."

What it means: the final diagnosis will be reflux. The service was not a reflux service. That paragraph documents an undiagnosed problem with uncertain prognosis, a workup, a considered and rejected higher-risk option, and a decision regarding hospitalization — which is high risk under Chapter 15 §15.7 whether or not the admission happened.

What to do about it: code the MDM from this paragraph, not from the discharge diagnosis. And code R07.9 — Chapter 12 §12.3's rule holds: in the outpatient setting, code the condition to the highest degree of certainty established, and a symptom code is correct when no definitive diagnosis was reached.

Where it appears: every ED chart worth its documentation. The ones that lack this paragraph are the ones that get downcoded, and the physician who wrote three lines documented the same work.

16.7 Critical care: time, bundling, and the services included

99291 — critical care, evaluation and management of the critically ill or critically injured patient, first 30–74 minutes +99292 — each additional 30 minutes

What makes care critical

A critical illness or injury acutely impairs one or more vital organ systems such that there is a high probability of imminent or life-threatening deterioration.

Critical care involves high-complexity decision making to assess, manipulate, and support vital system function to treat single or multiple vital organ system failure, and/or to prevent further life-threatening deterioration.

Location does not make care critical. A stable patient in an intensive care unit is not receiving critical care. A critically ill patient in an emergency department is. The definition is about the patient's condition and the nature of the work, not the sign on the door — and this is the single most common misunderstanding about the family.

The time rules

Under 30 minutes is not critical care. Report the appropriate E/M service for the setting instead. There is no partial 99291.

Time is aggregated for the date and need not be continuous.

It includes time spent on the unit devoted to that patient — reviewing data, discussing the patient's care with staff, documenting, and meeting with family when that discussion is necessary to determine treatment decisions and the patient is unable to participate. Time spent with family for other purposes does not count.

It excludes time spent performing separately reportable procedures, exactly as in Chapter 15 §15.8.

What is bundled

Critical care includes, and does not permit separate reporting of, a specific list of services — which is why the family generates unbundling denials at a rate out of proportion to its volume.

   BUNDLED INTO CRITICAL CARE  (not separately reportable)

     interpretation of cardiac output measurements
     chest radiograph interpretation
     PULSE OXIMETRY                 ◄ the one everybody bills anyway
     blood gas interpretation
     information data stored in computers (ECGs, BP, hematologic data)
     gastric intubation
     temporary transcutaneous pacing
     ventilator management
     vascular access procedures

Pulse oximetry is the famous one. It is bundled into critical care, it is performed on essentially every critical care patient, and it is reported separately often enough that it is a standing edit at most payers. Chapter 21 covers the edits; this is the list they enforce.

Procedures NOT on this list are separately reportable — and when they are, their time comes out of the critical care total.

🧮 Run the Numbers

A physician documents 95 minutes of critical care time on one date, including 20 minutes performing a separately reportable central line placement.

Step 1 — remove the separately reportable procedure. 95 − 20 = 75 minutes of critical care time.

Step 2 — apply 99291. The first 30–74 minutes. 99291 = 1.

Step 3 — the remainder. 75 − 74 = 1 minute beyond the 99291 range. +99292 is reported for each additional 30 minutes, and one minute is not thirty.

Report 99291 alone, plus the central line.

Now change one thing: no central line. 95 minutes of critical care. 99291 covers through 74; 95 − 74 = 21 minutes remaining, which is still not a full additional 30.

Still 99291 alone.

The lesson: the range 30–74 is wide, and coders reflexively add 99292 as soon as the total exceeds 74. (Note that some payers, Medicare among them, publish their own time-to-units tables for this family. Where a payer publishes one, it governs. Verify before you rely on the arithmetic above.)

Critical care and another E/M on the same date

A rule that appears on every certification exam and in a surprising number of real charts:

A separate E/M service may be reported on the same date as critical care when it was furnished at a time when the patient did not require critical care — typically an earlier encounter, before the patient deteriorated.

Modifier 25 — Chapter 14 §14.4 — identifies it, and the documentation has to make the sequence visible: an evaluation at one time, a deterioration, and critical care after. Two notes describing one continuous episode do not qualify, and this is the distinction that gets tested.

The other critical care families

Pediatric and neonatal critical care have their own code families, structured entirely differently from 99291/99292: they are reported per day rather than per unit of time, with separate initial and subsequent codes and separate families by age and by weight for the smallest patients.

Do not apply 99291's time arithmetic to them. A coder who reaches for the time rules in a neonatal intensive care unit is in the wrong section of the book, and the error is easy to make because the words "critical care" are the same.

16.8 Nursing facility and home visits

Two families, both restructured in 2023, both leveled by Chapter 15's framework.

Nursing facility

The annual nursing facility assessment code was deleted in 2023 and its work folded into the subsequent care codes.

Regulatory visits are a real constraint here. Nursing facilities operate under required visit schedules, and the interaction between a required visit and a medically necessary one is a genuine compliance question. Chapter 22 §22.4's medical necessity discussion applies with unusual force: a visit performed because a regulation requires it, in a patient who needed nothing, is not the same service as a visit performed because the patient's condition changed.

Home or residence services

The 2023 revision merged domiciliary, rest home, and custodial care services into this family. A separate set of codes for assisted living and similar settings no longer exists. If a reference lists domiciliary care codes, it predates the change — the same currency warning Chapter 15's further reading gave, applied here.

Home services use the new/established distinction — Chapter 15 §15.2's three-year rule, unchanged.

16.9 The professional claim and the facility claim from the same visit

Back to §16.1's structural fact, now in detail, because this is where facility coding actually differs from professional coding rather than merely accompanying it.

Both claims may carry the same code from the same range. In the ED anchor, 99284 appears on the facility claim and on the professional claim.

They were determined by completely different criteria.

There is no national leveling system for facility emergency department visits.

Each facility develops and applies its own written criteria, based on the resources it consumed — nursing interventions, monitoring, medications administered, time in the department — and must apply them consistently.

That surprises people, and it is why the two claims can differ. The physician's decision making and the department's resource consumption are different quantities. A patient requiring three hours of nursing observation and repeated interventions consumed substantial facility resources with modest physician decision making. A patient requiring a difficult diagnostic judgment and nothing else is the reverse.

A facility level that mirrors the physician level on every claim is itself a finding, because it suggests the facility is not applying its own criteria at all — it is copying.

What the facility criteria have to be

The absence of a national system is not an absence of requirements. Facility leveling criteria are expected to:

• Be written down, and applied consistently to all patients
• Relate to the resources the facility actually consumed — nursing interventions, monitoring, medications administered, procedures supported, time in the department — rather than to the patient's diagnosis or the physician's judgment
• Produce a distribution across the five levels that reflects the department's actual case mix
• Be reproducible: two people applying them to the same encounter should land in the same place
• Be auditable, meaning someone outside the department can follow the criteria from the record to the level

That last one is the practical test, and it is the one that fails. A facility whose criteria live in someone's head, or in a document last revised nine years ago, cannot demonstrate any of the others.

What a facility claim carries that a professional claim does not

Chapter 24 covers the UB-04 in full. Two elements matter here because they shape how facility coding works at all:

Revenue codes. Every line on a facility claim carries a four-digit revenue code identifying the department or cost center that provided it — 0450 for the emergency room, 0320 for diagnostic radiology, 0250 for pharmacy, 0300 for laboratory. The ED anchor's facility claim in §16.1 shows them. A revenue code says where; a CPT or HCPCS code says what, and outpatient facility lines generally need both.

Type of bill. A three- or four-digit code identifying the facility type, the classification of the bill, and its frequency — original, replacement, or void. The ED anchor's 131 identifies a hospital outpatient original claim. The frequency digit is how a corrected facility claim is distinguished from a duplicate, and getting it wrong is why some corrections deny as duplicates and some replace claims that should have been left alone.

Packaging. Notice in both the ED anchor and §16.10's counterfactual that supply and pharmacy lines show charges and zero allowed. They are packaged — paid as part of the payment for the primary service rather than separately. A zero-allowed line on a facility remittance is usually correct, and a billing office that works them as denials will waste an enormous amount of time. Chapter 28 §28.5 distinguishes the two, and it is one of the highest-value distinctions in facility billing.

Provider-based billing

One more structure worth naming, because it produces a specific and very unpopular patient experience.

A clinic owned by a hospital and designated as a provider-based department bills like a hospital outpatient department, not like a physician office: a professional claim and a facility claim, even though the patient visited what looks and feels like a doctor's office.

The patient's cost-sharing is generally higher as a result, sometimes substantially, for the same service in the same building with the same physician as before the practice was acquired.

Notice requirements apply in various circumstances, and this is one of the most reliably misunderstood items in patient financial services. Chapter 32 §32.2 covers the patient-facing side. The coder's part is smaller but real: know whether the site you are coding for is provider-based, because it determines whether there is a facility claim at all.

16.10 🗂️ The Encounter — same patient, same knee, in the emergency department

A counterfactual, run against Account 10-4471.

Suppose the knee pain worsened on a Sunday, three days before the March 14 appointment, and the patient went to the emergency department instead of waiting.

(Constructed. Every figure below is constructed and internally consistent; none of it happened on Account 10-4471, which was an office encounter. This is a comparison, not a record.)

What the emergency department actually does

Not the same clinical service. That is the first thing, and it matters more than the money.

An emergency department evaluates a knee to exclude the things that are dangerous — septic arthritis, fracture, a large effusion, a vascular or neurologic problem. It obtains imaging. It manages pain. It discharges the patient with a prescription and a referral.

It does not inject the knee. An intra-articular corticosteroid injection for a suspected degenerative process is not emergency care; it is the treatment the patient will receive later, in an office, once the dangerous things have been excluded.

So the ED visit does not replace the March 14 encounter. It precedes it.

The professional claim

The emergency physician, on the ED family, leveled on MDM only:

Two of three at moderate → 99284.

Note what disappeared. The three chronic conditions are not addressed by the emergency physician. Diabetes, hypertension, and hyperlipidemia are on the patient's record; the ED does not assess them, does not manage them, and does not plan for them. Chapter 15 §15.5's rule applies exactly: not addressed.

And note the fork. If the physician had advised an over-the-counter analgesic instead of writing a prescription, risk falls to low, only one element reaches moderate, and the visit is a 99283. One prescription, one level.

Time is not an option here at all — §16.6.

The two claims

Professional (CMS-1500), emergency physician and radiologist:

Facility (UB-04, type of bill 131):

Both claims together: charges \$2,897.00** · allowed **\$1,023.60.

Northfield Mutual's design, read the way Chapter 2 §2.7 teaches: deductible met February 28, 20% coinsurance on services other than the primary care office visit.

Patient: 20% of 1,023.60 = \$204.72**. Plan: **\$818.88.

Checks: 2,897.00 − 1,023.60 = 1,873.40 contractual adjustment ✓ · 204.72 + 818.88 = 1,023.60 ✓

The comparison

The allowed amount is 4.7 times higher. The patient pays 4.3 times more. And the knee is not treated — the office encounter still has to happen, at its own \$216.28, bringing the total to \$1,239.88 for a patient who ends up exactly where they would have been.

What this is and is not an argument for

It is not an argument that the patient did something wrong. On a Sunday, with worsening pain and no office open, an emergency department may be the only door. A person in pain making a reasonable choice is not the problem in this comparison, and a billing office that treats them as though they were will be both unkind and wrong.

What it is an argument for is that the site of service is one of the largest determinants of cost in American health care, that it is decided by circumstance far more often than by choice, and that this is why urgent care, after-hours access, and nurse triage lines exist as a matter of plan design rather than convenience.

And for the coder, three concrete things:

The same patient generates entirely different coding in a different setting — different code family, different level, different elements, and a whole second claim from a different entity.

Problems that are "addressed" in one setting are not addressed in another. Chapter 15's definition is not a formality; here it removes three chronic conditions from the scoring and drops the level.

And the patient will get two bills for one visit, weeks apart, from two organizations, and will call one of them to ask about the other. §16.1's 📞 On the Phone is the answer to that call.

🎓 Exam Watch

The counterfactual compresses four exam items into one scenario:

ED codes have no new/established distinction and no time option. Chronic conditions not assessed by the ED physician are not addressed and score nothing. One prescription moves the risk element and therefore the level — 99283 to 99284. One encounter, two claims, two patient balances.

Summary

Since 2023, everything in this chapter is leveled by Chapter 15's MDM grid. What differs is the setting, and the setting produces the errors.

A facility encounter is two claims — professional on the CMS-1500/837P, facility on the UB-04/837I — with two adjudications and two patient balances for one visit.

Inpatient and observation care share one code family (99221–99223 initial, 99231–99233 subsequent, 99234–99236 same-date, 99238/99239 discharge). "Initial" means the first service by that professional or their same-specialty group partner, not the admission.

Observation is an OUTPATIENT service. The two-midnight benchmark turns on the physician's documented expectation, not on hindsight. The consequences fall on the patient: Part B instead of Part A, self-administered drugs, and above all observation days not counting toward the skilled nursing facility three-day requirement. Condition Code 44 changes status only before discharge.

The hospital families have a time option (unlike the ED), stated as single thresholds rather than ranges. An office or ED visit by the same professional on the admission date rolls into the initial hospital care code — one service for the date, not two.

Discharge day management is once per stay, by the attending, on the actual discharge date, and 99239 requires the time to be documented.

Concurrent care is permissible. What it requires is that each professional's note stand on its own problems and decisions, with diagnosis pointers that reflect the difference. Copied notes make two claims indistinguishable and one of them will be denied — correctly. And a steady trickle of duplicate denials in a hospital-based group is very often an enrollment problem, not a coding one.

Consultations require all three Rs — request, render, report — documented. Medicare has not recognized them since 2010; report the setting-appropriate E/M instead. A consultant may treat and it is still a consultation; a transfer of responsibility is not.

Emergency department codes have no new/established distinction and no time option. The facility's ED level comes from its own written acuity criteria, not from the physician's MDM — which is why the two claims can carry different levels and both be right.

Critical care requires a critically ill patient and high-complexity decision making — not a location. Under 30 minutes is not critical care. A specific list of services is bundled, pulse oximetry most famously among them. A separate E/M with modifier 25 is reportable on the same date when it preceded the patient's need for critical care. Pediatric and neonatal critical care are per-day families and 99291's time arithmetic does not apply to them.

Nursing facility and home services were both restructured in 2023; domiciliary care codes no longer exist.

The Encounter's counterfactual: the same knee in the ED on a Sunday is a 99284 professionally (and a 99283 if no prescription is written), generates two claims totaling \$1,023.60 allowed against the office encounter's \$216.28**, costs the patient **\$204.72 instead of \$47.58 — and does not treat the knee.

Key Terms

Initial hospital inpatient or observation care — the first face-to-face service of the stay by a professional or by another of the same specialty in the same group. (Ch.16)

Subsequent hospital inpatient or observation care — any service after the initial one by that professional or group. (Ch.16)

Observation — a hospital service that is outpatient in status regardless of where the patient sleeps or how long they stay. (Ch.16)

Inpatient status — a formal admission determination, generally paid under Medicare Part A. (Ch.16)

Two-midnight benchmark — CMS's expectation-based benchmark: care expected to span at least two midnights generally supports inpatient admission. Judged on the documented expectation at the time of the decision. (Ch.16)

Condition Code 44 — the mechanism for changing an inpatient admission to outpatient status before discharge, following utilization review with physician concurrence. (Ch.16)

Discharge day management — 99238/99239; the aggregated discharge work for the date of discharge, reported once per stay by the attending. (Ch.16)

Consultation — a service rendered at another professional's request for an opinion, requiring a documented request, an opinion rendered, and a written report back. (Ch.16)

Transfer of care — the handing over of responsibility for management of a problem; not a consultation. (Ch.16)

Critical care time — aggregated time on the date devoted to a critically ill patient, including unit time and necessary family discussion, excluding separately reportable procedures. Under 30 minutes is not critical care. (Ch.16)

Emergency department levels — 99281–99285, leveled on medical decision making only, with no new/established distinction and no time-based option. (Ch.16)

Facility acuity leveling — a hospital's own written criteria for assigning a facility emergency department level based on resources consumed. There is no national system; the criteria must be written, consistent, resource-based, reproducible, and auditable. (Ch.16)

Concurrent care — similar services provided to the same patient by more than one professional on the same day. Permissible when each service is reasonable and necessary and the record shows what each professional was managing. (Ch.16)

Revenue code — the four-digit code on each facility claim line identifying the department or cost center that provided the service. A revenue code says where; a CPT or HCPCS code says what. (Ch.16)

Type of bill — the code on a facility claim identifying the facility type, bill classification, and frequency (original, replacement, void). (Ch.16)

Packaging — payment of a service as part of the payment for a primary service rather than separately, producing a facility remittance line with charges and zero allowed. Usually correct, and not a denial. (Ch.16)

Professional claim — the physician or QHP claim, CMS-1500 / 837P. (Ch.16)

Facility claim — the institutional claim, UB-04 / 837I. (Ch.16)

Provider-based billing — billing by a hospital-owned outpatient department, producing both a professional and a facility claim for a visit that resembles an office visit, generally with higher patient cost-sharing. (Ch.16)

Spaced Review

1. Explain, in two sentences, why one hospital visit generates two bills. Then write the version you would say to a patient.

2. (Chapter 15) An ED physician sees a patient with an undiagnosed new problem, orders one test, and prescribes a medication. Score all three MDM elements and give the code. What changes if the medication is over-the-counter?

3. A patient spends four nights in a hospital bed under observation and is discharged to a skilled nursing facility. What happens, and why?

4. State the three Rs. Which two fail most often, and what does a payer see when one is missing?

5. (Chapter 3) Observation is generally paid under which part of Medicare, and inpatient care under which? Name one consequence for the patient beyond the coinsurance.

6. A physician documents 95 minutes of critical care including 20 minutes of a separately reportable procedure. What do you report, and why is it not 99291 plus 99292?

7. The ED anchor carries 99284 on both claims. Explain how each level was determined and why the two determinations are independent.

8. (Chapter 15) Why do Account 10-4471's three chronic conditions score nothing in the ED counterfactual when they carried the level in the office?