Chapter 26: The UB-04: Completing the Institutional Claim, Revenue Codes, and Bill Types

"The professional claim asks what the physician did. This one asks what the building did, and the building did a great many things at once." — constructed

Overview

Chapter 25 built the professional claim. This is the other one.

The UB-04 — also called the CMS-1450 — is the institutional claim form. Hospitals, skilled nursing facilities, home health agencies, hospices, rural health clinics, dialysis facilities, and hospital outpatient departments bill on it. Its electronic equivalent is the 837I.

Chapter 16 §16.1 established the structural fact this chapter rests on:

One facility encounter produces TWO claims — a professional claim on the CMS-1500 and an institutional claim on the UB-04 — with two adjudications and two patient balances.

This chapter is the second one.

Three things make the UB-04 genuinely different from Chapter 25's form, and they are not cosmetic:

It bills a stay or an encounter, not a list of physician services. Chapter 33 will show that an inpatient claim's entire payment may come from a single DRG derived from the diagnoses — the service lines do not add up to the payment.

It uses a code set Chapter 25's form does not have: revenue codes. These say where in the building a charge came from, and they exist because the institution's costs are organized by department.

And it carries a large vocabulary of coded circumstances — condition, occurrence, occurrence span, and value codes — that have no equivalent on the professional claim at all.

In this chapter, you will learn to:

• Say why institutions bill differently
• Navigate the form locators
• Read a type of bill digit by digit
• Use revenue codes, and pair them with HCPCS
• Tell condition from occurrence from occurrence span from value codes
• Assign a discharge status and apply the transfer rule
• Apply the statement-covers period and the three-day window
• Reconstruct the Encounter as a facility claim
• Read a UB-04 you did not create

26.1 Why institutions bill differently

Start with what an institution is selling.

A physician sells professional work — evaluation, judgment, a procedure performed. Chapter 23 §23.2 priced it: work RVUs, practice expense, malpractice.

An institution sells a place with things in it. A staffed unit, an operating room, a pharmacy, a laboratory, imaging equipment, nursing hours, a bed for the night. Its costs are organized by department, because that is how a hospital's accounting works, and the claim is shaped by the accounting.

Three consequences.

The unit of billing is frequently the STAY, not the service. Chapter 33 covers inpatient DRG payment; the essential fact is that an inpatient claim can list forty charges and be paid one amount determined by the diagnoses. The charges still matter — they inform the payment system, they support outlier determinations, and they are what the charges are — but they are not a sum that produces the payment.

Charges are grouped by DEPARTMENT. Hence revenue codes — §26.4.

And a great deal of what the payer needs to know is not a service at all. Was the patient admitted from the emergency department? Did they leave against medical advice? Was this a readmission? What covered days remain? None of that fits in a procedure code, and §26.6's code families exist to carry it.

🎓 Exam Watch

The form has two names and exams use both. UB-04 is the common name — "uniform bill, 2004." CMS-1450 is its official designation. They are the same form.

And two more pairs worth fixing in memory:

Professional	Institutional
CMS-1500	UB-04 / CMS-1450
837P	837I
maintained by the NUCC	maintained by the NUBC
fields are items	fields are FORM LOCATORS (FL)

The NUBC — National Uniform Billing Committee — is the institutional counterpart to Chapter 25's NUCC, and it publishes the UB-04 Data Specifications Manual, which is the authority on what each form locator wants. Unlike the NUCC manual, it is not free — it is a subscription publication, which is worth knowing before you go looking for it.

26.2 The form locators, in blocks

The UB-04 has 81 form locators. Learning them as a list is hopeless; learning them as six blocks is manageable.

   FL 1–13      WHO AND WHERE
                the provider, the patient, the control number,
                THE TYPE OF BILL (FL 4), the STATEMENT COVERS
                PERIOD (FL 6), and patient demographics

   FL 14–41     THE CIRCUMSTANCES
                admission date/hour/type/source (14–17),
                DISCHARGE STATUS (17),
                CONDITION CODES (18–28),
                OCCURRENCE CODES (31–34),
                OCCURRENCE SPAN CODES (35–36),
                VALUE CODES (39–41)

   FL 42–49     THE CHARGES
                REVENUE CODE (42) · description (43) ·
                HCPCS/rate (44) · service date (45) ·
                units (46) · total charges (47) ·
                non-covered charges (48)

   FL 50–65     THE PAYERS
                payer name, health plan ID, prior payments,
                estimated amount due, the insured, and
                TREATMENT AUTHORIZATION CODES (63)

   FL 66–75     THE DIAGNOSES AND PROCEDURES
                ICD indicator (66), PRINCIPAL and other
                DIAGNOSES with POA indicators (67),
                ADMITTING DIAGNOSIS (69), reason for visit (70),
                PRINCIPAL and other PROCEDURES (74)

   FL 76–81     THE PROVIDERS AND THE REST
                attending (76), operating (77), other (78–79),
                remarks (80), code-code field (81)

Three navigational facts.

FL 4 and FL 6 do more work than any other pair on the form. The type of bill says what kind of claim this is; the statement-covers period says what dates it covers. §26.3 and §26.8.

FL 42–49 is the only block that repeats. Twenty-two lines per page, and a claim can run to multiple pages — with FL 47's total on the final page and revenue code 0001 as the total line.

And the diagnosis block is where inpatient payment is actually determined, which is the single largest difference from Chapter 25's form. FL 67's principal diagnosis and its secondary diagnoses, with their POA indicators, drive the DRG — Chapter 33.

Two identifiers in the first block that are not the same thing

FL 3a and 3b, and confusing them produces a specific and persistent problem.

FL 3a — the PATIENT CONTROL NUMBER. The facility's own identifier for this claim or account. The payer returns it on the remittance, which is how the payment gets posted to the right account — Chapter 28 §28.5.

FL 3b — the MEDICAL RECORD NUMBER. The facility's identifier for this patient, across all their encounters.

One is per encounter. One is per person. A patient with eleven admissions has eleven patient control numbers and one medical record number.

Why it matters: a facility that populates the medical record number into FL 3a gets remittances it cannot post automatically, because the returned identifier does not identify an account. Chapter 28 §28.7's autoposting depends on FL 3a coming back, and this is one of the few fields on the form whose sole purpose is to make the money land in the right place.

The diagnosis block's three different diagnoses

FL 67, FL 69, and FL 70 all hold diagnoses, and they are answering different questions.

These frequently differ, and that is not an error. A patient admitted with chest pain (FL 69) whose workup establishes acute myocardial infarction (FL 67) has a claim where the two fields disagree — and the disagreement is the story of the admission.

Chapter 12 §12.3's rule governs FL 70 in the outpatient setting: code to the highest degree of certainty established. Chapter 33 §33.2 governs FL 67 for inpatients, where "after study" permits a principal diagnosis that was not suspected on arrival.

And a claim where FL 69 and FL 67 are always identical is a claim nobody is populating thoughtfully — because a hospital's admissions do not routinely confirm the initial impression.

FL 48 — non-covered charges

A column beside the charges that reports what the payer is not being asked to pay.

Two uses, and they are different in kind:

Statutorily non-covered items — Chapter 22 §22.9's GY territory, on the institutional side.

And charges the facility knows are not payable for this stay — services during a non-covered period, a private room differential the patient requested, days beyond a benefit limit.

A non-covered charge is still reported. It appears in FL 47 as a charge and in FL 48 as non-covered, and the difference between the two columns is what the payer is being asked for.

Leaving a known non-covered charge out of the claim entirely is not tidier — it removes the payer's record of it, and on the patient side it removes the basis for billing the patient at all.

26.3 Type of bill, digit by digit

FL 4, and it is the most information-dense field on either claim form.

The type of bill is read as a sequence, and each position answers a different question. It is commonly written as three digits with a leading zero, so a "131" appears as 0131.

   0  1  3  1
   │  │  │  └── FREQUENCY — what kind of submission is this?
   │  │  └───── BILL CLASSIFICATION — what kind of care?
   │  └──────── FACILITY TYPE — what kind of facility?
   └─────────── leading zero

Facility type — the first meaningful digit

Bill classification — the second

For hospitals (facility type 1):

Frequency — the third, and the one that causes damage

This is the digit Chapter 16 §16.9 warned about, and it is where a corrected claim is distinguished from a duplicate.

0131 = hospital · outpatient · admit through discharge.

That is the ED anchor's facility claim from Chapter 16 §16.1, and Account 22-9107's, and the type of bill on §26.9's reconstruction. Read it as three answers rather than as a number and it stops being arbitrary.

Two things the frequency digit decides.

7 versus 8. A replacement submits a corrected claim that supersedes the original. A void withdraws the original entirely. Chapter 25 §25.3 made the same distinction with item 22's resubmission code, and the failure is identical: submitting a corrected claim with frequency 1 creates a duplicate, not a correction.

And 2/3/4 are a sequence. Interim billing on a long stay produces a first, some number of continuing, and a last claim — and they must be submitted in order and must not overlap. §26.8.

26.4 Revenue codes and what they group

The code set that has no equivalent on the professional claim.

A revenue code is a four-digit code identifying the department or cost center that provided a service or item.

A revenue code says WHERE. A HCPCS code says WHAT.

The ones you will meet constantly:

Three rules.

Revenue codes are grouped by hundreds, and the hundreds are meaningful: 02xx is largely ancillary supply and pharmacy, 03xx is laboratory and radiology, 04xx is therapy and emergency, 06xx is specialized drugs and services, 07xx is diagnostic services.

0001 is the total line, and it appears once, on the last page.

And the 011x–021x range encodes something no professional claim carries: the ACCOMMODATION — private, semi-private, ward — and the LEVEL OF CARE — general medical/surgical, intensive care, coronary care, nursery. A stay that moves between units produces lines under more than one code, with the units on each showing how many days at that level. A private room the patient requested, where semi-private was medically sufficient, is generally a non-covered differential — which lands in FL 48 and is one of the few places a facility bills a patient for something the payer correctly declined.

The room and board lines are also the fastest sanity check on a facility claim. Add the units across the accommodation lines. They should reconcile to the statement-covers period, allowing for the discharge-day convention — and when they do not, something about the dates or the transfers is wrong.

And a revenue code is not optional. Every charge line on a UB-04 has one — which is the structural difference from Chapter 25's form, where a line has a procedure code and nothing about department.

⚠️ Where Claims Die

Revenue code 0636 is where a facility's drug billing goes wrong, and Chapter 20's whole chapter arrives here.

0636 — drugs requiring detailed coding — requires a HCPCS code and units on the same line. It is the revenue code that says this is a specific drug in a specific quantity, and:

The units are Chapter 20 §20.3's arithmetic. Dose administered ÷ the descriptor's dosage. Chapter 21's medically unlikely edits check this field.

The NDC is Chapter 20 §20.8's problem, arriving in the supplemental data.

And the waste question is Chapter 20 §20.4's — JW, JZ, and the requirement that the two lines add up to the container.

A facility billing drugs under 0250 (pharmacy) when 0636 is required reports the charge without the identifying detail, and the line pays as an undifferentiated pharmacy charge — or does not pay at all. Chapter 20's Case Study 1 was a practice; the facility version of the same failure runs at a different order of magnitude, because a hospital pharmacy dispenses continuously.

26.5 Pairing revenue codes with HCPCS

When does a line need both?

   INPATIENT (TOB x1x)
     ► revenue codes required
     ► HCPCS generally NOT required on most lines
       (the DRG is derived from diagnoses and procedures
        in FL 67 and FL 74 — Chapter 33)

   OUTPATIENT (TOB x3x)
     ► revenue codes required
     ► HCPCS REQUIRED on most lines
       (payment is per service under OPPS — Chapter 34)

That contrast is the whole section, and it explains something students find confusing: the same facility, billing the same kind of charge, needs a HCPCS code on an outpatient claim and frequently does not on an inpatient one.

The reason is the payment system, not the form. Chapter 33's inpatient prospective payment derives a DRG from diagnoses and procedures, not from the charge lines. Chapter 34's outpatient prospective payment pays per service, and the service has to be identified.

Three practical notes.

Some revenue codes always require a HCPCS, regardless of setting — 0636 is the standing example.

Some revenue codes are never paired with one — room and board, most obviously.

And the payer's requirements can be stricter than the general rule. Chapter 25 §25.9's companion guide is the document, and it is as relevant here as there.

The pairing is a crosswalk, and it lives in the chargemaster

Where does a facility's revenue-code-to-HCPCS pairing actually come from?

The chargemaster. Chapter 23 §23.8's tens of thousands of lines, each one carrying a description, a charge, a revenue code, and — where required — a HCPCS code.

Which means three of this book's earlier findings land here as one problem:

A terminated HCPCS code on a chargemaster line — Chapter 20 §20.1's quarterly updates — denies on every claim carrying that line, and the denial names the line, not the code set.

A revenue code the payer does not accept for that type of bill produces a rejection that looks mysterious until somebody compares the two fields.

And a line with a revenue code requiring a HCPCS and no HCPCS mapped produces the §26.4 failure — a charge with no identification.

None of these is a coding decision. They are maintenance, and Chapter 23 §23.8's four decay mechanisms are the reason they accumulate. A facility coder who receives a denial for a revenue-code/HCPCS mismatch is looking at a chargemaster problem wearing a claim's clothes.

🔢 Code It

Four charges from one outpatient encounter. Build the lines.

A patient receives, in a hospital outpatient department: a clinic visit, a chest radiograph, two views, a therapeutic injection of a drug, and a basic metabolic panel.

text FL 42 FL 43 FL 44 HCPCS FL 46 UNITS ───────────────────────────────────────────────────────── 0510 Clinic [visit code] 1 0320 Radiology–diag 71046 1 0636 Drugs/detail [J-code] [Ch. 20 §20.3] 0300 Laboratory 80048 1 0001 TOTAL ─────────────────────────────────────────────────────────

Four decisions, and only one of them is a coding decision.

The radiograph goes under 0320, diagnostic radiology — not 0450, even if the patient came through the emergency department. The revenue code follows the DEPARTMENT that performed it, not the department the patient arrived in.

The drug goes under 0636, not 0250. §26.4. 0250 is pharmacy generally; 0636 is a specific drug in a specific quantity, and this one needs a HCPCS and units.

The panel goes under 0300 with 80048 — and Chapter 19 §19.4's panel rule still applies: report the panel, not its components, and only if every component was performed.

And the units on the drug line are Chapter 20 §20.3's arithmetic — dose administered ÷ the descriptor's dosage — which is the only line here where the number requires thought.

The lesson: most of a facility charge line is determined by where the charge came from, and that determination was made when the chargemaster was built rather than when the claim was coded.

26.6 Condition, occurrence, occurrence span, and value codes

Four families, easily confused, and the distinction is genuinely simple once stated:

CONDITION codes (FL 18–28) report a circumstance that is true — a yes/no fact about the claim.

OCCURRENCE codes (FL 31–34) report a DATE something happened — a single date.

OCCURRENCE SPAN codes (FL 35–36) report a DATE RANGE — a from and a through.

VALUE codes (FL 39–41) report AN AMOUNT — a number, usually money or a count.

   IS IT TRUE?          → CONDITION      (a fact)
   WHEN DID IT HAPPEN?  → OCCURRENCE     (a date)
   HOW LONG?            → OCCURRENCE SPAN (a range)
   HOW MUCH / HOW MANY? → VALUE          (an amount)

Examples of each, to make the shape concrete:

Condition — a claim is being submitted for a specific reason, a bill is a readmission, a patient was not required to meet a deductible, or the well-known Condition Code 44 (Chapter 16 §16.3), which reports that an inpatient admission was changed to outpatient before discharge.

Occurrence — the date of an accident, the date of the onset of symptoms, the date insurance coverage terminated, the date of the first visit.

Occurrence span — the dates of a qualifying inpatient stay for a skilled nursing facility claim (Chapter 16 §16.3's three-day rule, arriving as a field), or a period of non-covered care.

Value — the amount of a deductible or coinsurance applied, the number of covered days, the number of coinsurance days, or a patient's weight in grams for a newborn.

Why these families exist at all

The professional claim has nothing like this, and the reason is worth a paragraph.

A CMS-1500 describes services performed on a person. Everything it needs to say fits in a code, a modifier, a date, and a pointer.

A UB-04 describes an episode inside an institution, and an episode has properties a service does not: it started somewhere, it lasted a period, it was interrupted, it ended in a disposition, and it consumed benefit days. None of that is a procedure.

So the institutional claim carries a second vocabulary alongside the codes — one that reports facts, dates, ranges, and amounts about the episode rather than about any service in it.

Two practical consequences.

These fields drive payment more often than students expect. A value code reporting covered days, an occurrence span reporting a qualifying stay, a condition code reporting a readmission — each one can change what a claim pays without touching a single procedure code.

And they are populated by different people. Registration supplies admission source and type; the unit supplies discharge status; utilization review supplies Condition Code 44; the business office supplies value codes for benefit amounts. A facility claim is assembled from four departments' contributions, which is why §26.10's reading order does not start with the codes.

🔍 Check Your Understanding

A patient is admitted, and the following facts are true of the claim. Which family carries each?

1. The patient was in a qualifying inpatient stay from March 2 through March 5.
2. The patient's Part A deductible of a stated amount was applied.
3. The admission was changed from inpatient to outpatient before discharge.
4. The patient's symptoms began on February 27.
5. The stay included 4 covered days.

Answers:

1 — OCCURRENCE SPAN. A from date and a through date. (And Chapter 16 §16.3's skilled nursing qualification is what makes this field matter.)

2 — VALUE. An amount.

3 — CONDITION. A fact about the claim, and it is Condition Code 44 specifically.

4 — OCCURRENCE. A single date.

5 — VALUE. A count is an amount.

The item most people miss is 5, because "days" feels like a span. It is not a range with a start and an end — it is a NUMBER, and the four families are distinguished by shape, not by subject matter.

26.7 Patient discharge status and the transfer rule

FL 17, two digits, and it decides more money than any other small field on the form.

Patient discharge status reports where the patient went at the end of the stay.

The ones that recur:

The transfer rule

And here is why the field is consequential.

Under Medicare's inpatient prospective payment system, a hospital that TRANSFERS a patient rather than discharging them may be paid a per-diem amount rather than the full DRG — under defined circumstances, for defined DRGs, when the length of stay is below the geometric mean.

Chapter 33 §33.8 covers the arithmetic. What belongs here is the field-level consequence:

A discharge status of 01 on a stay that was actually a transfer overstates the payment, and a transfer status on an actual discharge understates it. Both are wrong on a claim that is otherwise perfect, and neither denies.

Two more reasons the field matters beyond payment.

Readmission programs use it. A patient discharged home who returns within a defined window counts differently from one transferred.

And 07 — left against medical advice — is clinically and legally significant in ways that have nothing to do with billing. It is a fact about what happened, and coding it because the patient was not formally discharged is misreporting a clinical event.

The provider block — FL 76 through 79

Four provider fields, and the distinction parallels Chapter 25 §25.6's without being identical.

Three notes.

The attending is not the admitting physician and not the discharging one — it is whoever held primary responsibility. On a stay where care transfers, one name goes here.

FL 77 is conditionally required, and the condition is FL 74: if a procedure is reported, an operating provider generally must be. A claim with a surgical procedure and a blank FL 77 is internally inconsistent.

And none of these is the BILLING provider. The institution bills; FL 1's provider name and address and FL 56's NPI carry that. Chapter 25's rendering-versus-billing distinction applies here too, and the same confusion produces the same denials.

FL 63 and FL 80 — the two fields that carry words

FL 63 — treatment authorization codes. Chapter 24 §24.6's authorization number, on the institutional claim. And Chapter 24's warning applies unchanged: the number without its scope is a number, not a record, and the scope does not fit in FL 63.

FL 80 — remarks. A free-text field.

FL 80 is the field where the truth frequently sits. §26.10's 📋 turns on exactly this: a remark saying the patient was transferred, on a claim whose FL 17 says discharged home.

Somebody wrote down what happened in the one field nobody adjudicates, and reading it is the cheapest review step on the form.

⚖️ Compliance Check

Discharge status is a documented audit target, and the finding is almost always the same: the field does not match the record.

The mechanism is mundane. Discharge status is frequently entered by unit clerical staff at the end of a stay, from a discharge order, under time pressure, into a field with sixty-odd possible values. It is not a coding decision and it is not usually reviewed by anyone who codes.

Three specific patterns reviewers look for:

A status of 01 where the record documents a transfer — the overpayment direction.

A status of 30, "still a patient," on a claim that is not an interim claim. It is a mismatch between FL 17 and FL 4's frequency digit, and the two fields have to agree.

And a facility whose distribution of discharge statuses differs markedly from comparable facilities, which is measurable from claims data with no chart — Chapter 21 §21.10's principle in a different field.

The remedy is unglamorous: reconcile FL 17 against the discharge summary, on a sample, on a schedule. It is one of the few facility-side checks that a coder can run and that nobody is running.

26.8 The statement-covers period and the three-day payment window

FL 6 — the statement covers period

From and through dates for the services on this claim.

Three rules.

Every service date on the claim must fall within it. A charge dated outside the period is an inconsistency the payer will find.

Interim claims must not overlap. A first claim through March 10 and a continuing claim from March 10 double-count a day, and the payer will reject or recoup it.

And the period is not the same as the stay on an outpatient claim. A series claim — a facility billing recurring outpatient services monthly — has a statement period covering a month of visits, and that is correct.

The three-day payment window

A rule about a boundary, and one of the most commonly misunderstood in facility billing.

Under Medicare, outpatient services furnished by a hospital (or a wholly owned or operated entity) within THREE DAYS before an inpatient admission are, in defined circumstances, bundled into the inpatient claim rather than billed separately.

Three notes.

It is three days for most acute care hospitals and one day for certain excluded facilities — psychiatric, rehabilitation, long-term care, and others.

Diagnostic services are treated differently from non-diagnostic ones. Diagnostic services in the window are generally bundled; non-diagnostic services are bundled when they are related to the admission, with a mechanism for attesting that they were not.

And the practical failure is a facility billing the outpatient encounter separately and the inpatient stay separately, producing what looks like two legitimate claims and is one claim plus an overpayment. It does not deny — Chapter 34 §34.10 covers the mechanics.

📞 On the Phone

"We're being asked to combine an outpatient claim into an inpatient stay from three days later."

The caller is usually right and usually annoyed, because the outpatient claim already paid and now the money is coming back.

Four questions, in order:

"What is the admission date, and what is the outpatient date of service?" Establish whether it is actually within the window.

"Is the outpatient site wholly owned or operated by the admitting hospital?" The rule reaches owned entities, and a great many practices do not know their own ownership status — Chapter 20's Case Study 2 in a different form.

"Were the services diagnostic or non-diagnostic?" They are treated differently.

"If non-diagnostic, were they related to the admission?" There is an attestation mechanism, and it is the only place the answer can be "no."

What does not work: disputing the recoupment on the ground that the outpatient claim was correct. It was correct as a standalone claim — and the rule says it should not have been a standalone claim. Those are compatible.

26.9 🗂️ The Encounter — the same encounter as a facility claim

A counterfactual, and it is the second one this book has run on Account 10-4471.

Chapter 16 §16.10 put the patient in the emergency department. This one keeps everything the same and changes only where the practice sits:

Suppose Northgate Family Medicine had been acquired by a hospital system and converted to a provider-based department — Chapter 16 §16.9, Chapter 23 §23.5, and Chapter 23's Case Study 1.

Same patient. Same date. Same physician. Same knee. Same four services.

(Constructed. Every figure below is constructed and internally consistent. This did not happen; Northgate is an independent practice.)

What changes on the professional claim

Very little, and that is the point.

The physician still performs the same services and reports the same codes: 99214-25, 20610-RT, J1030, 36415.

Two things change:

Place of service becomes 22 — on-campus outpatient hospital — instead of 11. Chapter 23 §23.5.

And the professional payment drops, because the practice expense RVU is now the facility value — the facility supplied the overhead and bills for it separately.

What appears that did not exist before

A second claim. A UB-04.

   FL 4    TYPE OF BILL ............ 0131
                                     hospital · outpatient · admit through discharge

   FL 6    STATEMENT COVERS ........ 03/14 through 03/14

   FL 42   REVENUE  FL 44 HCPCS   FL 46 UNITS   FL 47 CHARGES
   ─────────────────────────────────────────────────────────────
   0510    Clinic                        1        [facility charge]
   0636    Drugs/detail   J1030          1        [drug charge]
   0300    Laboratory                    1        [venipuncture]
   ─────────────────────────────────────────────────────────────
   0001    TOTAL                                  [total]

   FL 67   PRINCIPAL DIAGNOSIS ..... M25.561
           other diagnoses ......... E11.9, I10, E78.5

   FL 76   ATTENDING PROVIDER ...... [the physician]

Three observations.

The facility claim's diagnoses are the same four, in the same order, and M25.561 is the principal diagnosis — the reason for the encounter.

The drug appears on BOTH claims in different roles. Chapter 20's J1030 is a supply the physician billed on the professional claim; in a provider-based setting the facility supplied it, and the line moves. Which one carries it is an ownership question, not a coding question — and it is exactly Chapter 19 §19.1's four arrangements applied to a drug.

And the patient now has two claims and two cost-sharing calculations. Chapter 16 §16.9's provider-based billing, and Chapter 16 §16.10's ED counterfactual measured the same effect at 4.7 times the allowed amount.

🧮 Run the Numbers

The same encounter, two ways. (Constructed. The right-hand column did not happen; Northgate is independent. Every figure is constructed and internally consistent.)

```text INDEPENDENT PROVIDER-BASED (what happened) (the counterfactual)

PROFESSIONAL CLAIM 99214-25 .............. 128.40 88.40 20610-RT .............. 78.60 52.40 J1030 ................. 6.28 4.80 36415 ................. 3.00 3.00 ─────── ─────── professional allowed 216.28 148.60

FACILITY CLAIM (UB-04, 0131) 0510 clinic ........... — 0636 drug ............. — 0300 laboratory ....... — ─────── facility allowed 0.00 212.40

───────────────────────────────────────────────────────── TOTAL ALLOWED 216.28 361.00 ► 1.67× PATIENT 47.58 84.52 ► 1.78× PLAN 168.70 276.48 ```

Checks: 88.40 + 52.40 + 4.80 + 3.00 = 148.60 ✓ · 148.60 + 212.40 = 361.00 ✓ · patient 30.00 copay + 20% of 60.20 = 42.04, plus 20% of 212.40 = 42.48, total 84.52 ✓ · 361.00 − 84.52 = 276.48 ✓

Three things to read off that table.

The professional allowed amount FELL — from \$216.28 to \$148.60 — because the practice expense moved to the facility. Chapter 23 §23.5's site-of-service differential, in dollars.

The total ROSE by two-thirds, because the facility's claim more than replaces what the physician gave up. Chapter 16 §16.10 measured the same effect at 4.7× for an emergency department; a converted office is a milder version of the same structure.

And the patient's share nearly doubled — \$47.58 to \$84.52 — for the same care, from the same physician, in the same room. Chapter 16 §16.9 said provider-based cost-sharing is generally higher; this is the arithmetic.

What the table is NOT. It is not an argument that the conversion is improper. Hospital outpatient departments carry costs an independent office does not, and the payment structure reflects that. It is an argument that the patient cannot see any of this, which is why Chapter 16 §16.9's notice requirements exist and why Chapter 32 §32.2's estimate has to account for it.

What this counterfactual is for

Not to argue that provider-based billing is wrong. It is a lawful arrangement with a rationale — hospital outpatient departments carry costs an independent practice does not.

It is to make one thing unmistakable:

The claim's shape is determined by WHO OWNS THE BUILDING, not by what happened to the patient.

Same patient, same physician, same knee, same four services, same date. One claim or two, depending on a corporate structure the patient cannot see and did not choose.

And it is why Chapter 23's Case Study 1 was possible. A practice that converts and does not change its place of service code is submitting the professional claim for a world that no longer exists — and it pays, at the wrong rate, silently.

26.10 Reading a UB-04 you did not create

The practical skill, and Chapter 25 §25.9 established the discipline it needs: do not check the codes first.

   READING A UB-04 — IN THIS ORDER

   1. FL 4  TYPE OF BILL
            What kind of claim is this, and is the FREQUENCY right?
            ► a corrected claim with frequency 1 is a duplicate

   2. FL 6  STATEMENT COVERS PERIOD
            Do all the service dates fall inside it?
            ► and on an interim claim, does it overlap the last one?

   3. FL 17 DISCHARGE STATUS
            Does it match the record? Does it match FL 4's frequency?
            ► 30 "still a patient" on a non-interim claim is a mismatch

   4. FL 42 REVENUE CODES
            Is 0636 used where a drug needs detail?
            Is there a HCPCS where the setting requires one?

   5. FL 67 DIAGNOSES
            Is the principal diagnosis the reason for the encounter?
            Are the POA indicators present? (Ch. 33 §33.7)

   6. THE CODES
            Last. They are usually fine.

Three things that are wrong more often than the codes:

The type of bill's frequency digit — §26.3.

The discharge status — §26.7, and it is entered by someone who is not a coder.

And a revenue code that does not match the charge. A drug under pharmacy when it needed detail; a supply under the wrong department; a charge under a revenue code the payer does not recognize for that type of bill.

This is the same lesson as Chapter 25 §25.9 and it is worth stating twice, because the instinct is strong: on a facility claim as on a professional one, the codes are usually the part that is right.

📋 Read the Chart

Source: a UB-04 handed to you because it denied What it says:

text FL 3a [the patient's medical record number] FL 4 0111 FL 6 03/02 through 03/09 FL 17 01 FL 42 0250 Pharmacy FL 44 [blank] FL 46 1 FL 47 [large] 0110 Room/board FL 46 8 0001 TOTAL FL 67 PRINCIPAL: I10 POA: Y other: J44.1 POA: Y FL 69 ADMITTING: I10 FL 76 ATTENDING [physician] FL 80 "transferred to Community Rehab 3/9"

What it means: at least five things are wrong, and the diagnosis codes are all valid.

FL 3a holds the medical record number. The remittance will return an identifier that does not identify an account — §26.2 — and this claim will not autopost.

FL 17 says 01, discharged home. FL 80's remark says the patient was TRANSFERRED. Discharge status 02 or 62, depending on the receiving facility. §26.7's transfer rule, and the direction is overpayment.

FL 42's pharmacy line has a large charge and no HCPCS. If those are drugs requiring detailed coding, the revenue code should be 0636 with a HCPCS and units — §26.4.

FL 6 covers 03/02 through 03/09 — eight days — and FL 46 reports 8 units of room and board. Arithmetically consistent, and worth checking against the record: a stay from the 2nd through the 9th is commonly billed as seven days, because the discharge day is generally not a covered day. This one needs the record, not the form.

And FL 67's principal diagnosis is I10, essential hypertension, with J44.1 — COPD with acute exacerbation — secondary. On an eight-day admission, hypertension as the condition chiefly responsible for the stay is implausible on its face. Chapter 33 §33.2 governs, and this is very likely a sequencing error that costs the facility a great deal — Chapter 33 §33.10's \$1,867.44 is the same shape.

What to do about it: four of the five are non-clinical or sequencing issues, and only the last requires a coder to open the record. A reviewer who checks the diagnosis codes for validity will find all three valid and return the claim unchanged.

Where it appears: every denied facility claim anyone hands you. The remark in FL 80 contradicting FL 17 is the specific pattern to look for — somebody wrote down what happened in the one field nobody adjudicates.

Summary

The UB-04 — also the CMS-1450 — is the INSTITUTIONAL claim. Its electronic form is the 837I. Maintained by the NUBC, whose UB-04 Data Specifications Manual is the authority and is a subscription publication, unlike the NUCC's free manual. Fields are FORM LOCATORS, not items.

Institutions bill differently because they sell a place with things in it, and their costs are organized by department. The unit of billing is frequently the STAY — an inpatient claim can list forty charges and be paid one DRG amount derived from the diagnoses.

81 form locators in six blocks: who and where · the circumstances · the charges · the payers · the diagnoses and procedures · the providers.

FL 3a is the PATIENT CONTROL NUMBER — per encounter — and the payer returns it on the remittance so the payment can be posted. FL 3b is the MEDICAL RECORD NUMBER — per person. A facility that populates 3b into 3a gets remittances it cannot autopost.

Three fields hold diagnoses and answer different questions: FL 67 PRINCIPAL (chiefly responsible, established after study) · FL 69 ADMITTING (what was suspected) · FL 70 reason for visit (outpatient). They frequently differ, and the disagreement is the story of the admission — a claim where 67 and 69 are always identical is one nobody is populating thoughtfully.

FL 48 reports NON-COVERED charges. The charge is still reported; the difference between FL 47 and FL 48 is what the payer is being asked for. Omitting a known non-covered charge entirely removes the payer's record of it and the basis for billing the patient.

TYPE OF BILL, DIGIT BY DIGIT

facility type · bill classification · FREQUENCY. 0131 = hospital · outpatient · admit through discharge. Frequency 7 = replacement · 8 = void. A corrected claim submitted with frequency 1 creates a duplicate — the same failure as Chapter 25's blank item 22.

A REVENUE CODE SAYS WHERE. A HCPCS CODE SAYS WHAT.

0250 pharmacy · 0270 supplies · 0300 laboratory · 0320 radiology · 0360 operating room · 0450 emergency · 0636 drugs requiring detail · 0001 the total line.

Inpatient claims require revenue codes and generally not HCPCS — the DRG comes from FL 67 and FL 74. Outpatient claims require both, because OPPS pays per service. The reason is the payment system, not the form.

The revenue-code-to-HCPCS pairing lives in the CHARGEMASTER, which means a terminated HCPCS code, an unaccepted revenue code, or a missing mapping all arrive as claim denials and are all maintenance problems wearing a claim's clothes. The revenue code follows the DEPARTMENT that performed the service, not the department the patient arrived in.

The professional claim has nothing like the circumstance codes, because a CMS-1500 describes services performed on a person and everything it needs fits in a code, a modifier, a date, and a pointer. A UB-04 describes an EPISODE inside an institution — which started somewhere, lasted a period, may have been interrupted, ended in a disposition, and consumed benefit days. None of that is a procedure. These fields drive payment more often than students expect, and they are populated by four different departments, which is why §26.10's reading order does not start with the codes.

Four coded circumstance families, distinguished by SHAPE:

   CONDITION       a FACT       (Condition Code 44 — Ch. 16 §16.3)
   OCCURRENCE      a DATE
   OCCURRENCE SPAN a RANGE      (the qualifying stay — Ch. 16 §16.3)
   VALUE           an AMOUNT    (including COUNTS, e.g. covered days)

Patient discharge status (FL 17) reports where the patient went, and the transfer rule means a hospital that transfers may be paid a per diem rather than the full DRG. A status of 01 on an actual transfer overstates the payment; neither error denies. It is entered by clerical staff, into a field with sixty-odd values, and it is a documented audit target.

The provider block: FL 76 ATTENDING — primary responsibility, required on virtually every claim · FL 77 OPERATING — conditionally required when FL 74 reports a procedure · FL 78/79 OTHER, with a qualifier. None of them is the billing provider; the institution bills.

FL 63 carries the treatment authorization code — and Chapter 24 §24.6's warning applies unchanged: the number without its scope is a number, not a record, and the scope does not fit in the field. FL 80 is remarks, and it is the field where the truth frequently sits — §26.10's example turns on a remark contradicting FL 17.

The statement-covers period must contain every service date, and interim claims must not overlap. The three-day payment window bundles hospital outpatient services within three days of an admission into the inpatient claim — one day for certain excluded facilities, with diagnostic and non-diagnostic services treated differently. The outpatient claim was correct as a standalone claim, and it should not have been a standalone claim. Those are compatible.

Reading a UB-04: type of bill → statement period → discharge status → revenue codes → diagnoses → and the codes LAST. They are usually fine.

Three things are wrong more often than the codes: the frequency digit · the discharge status (entered by someone who is not a coder) · a revenue code that does not match the charge. And the specific pattern to look for is a remark in FL 80 contradicting FL 17 — somebody wrote down what happened in the one field nobody adjudicates.

The Encounter, as a facility claim:

Same patient, same physician, same knee, same four services, same date — and one claim or two, depending on who owns the building. Place of service becomes 22, the professional payment drops because the facility supplied the overhead, a 0131 UB-04 appears, and the drug line moves to whoever owns it.

The claim's shape is determined by a corporate structure the patient cannot see and did not choose.

And what Part V has now built. Chapter 24 got the encounter ready. Chapter 25 put the professional services on a form. Chapter 26 has shown what the other half looks like when there is one.

Chapter 27 turns both of them into transactions — the 837P and the 837I, the loops and segments Chapter 25's Case Study 1 was about, the clearinghouse, and the acknowledgments that come back over three days.

Chapter 28 reads what arrives on day 17.

Two forms, two vocabularies, and by the end of Part V both of them will have become a single stream of text that a machine reads and a person has to be able to interrogate.

Key Terms

UB-04 / CMS-1450 — the institutional claim form. (Ch.26)

NUBC — the National Uniform Billing Committee, which maintains the form and publishes the UB-04 Data Specifications Manual. (Ch.26)

Form locator (FL) — a numbered field on the UB-04; the institutional counterpart to the CMS-1500's item. (Ch.26)

837I — the electronic institutional claim transaction. (Ch.26)

Type of bill — FL 4; a sequence encoding facility type, bill classification, and frequency. (Ch.26)

Frequency digit — the last position of the type of bill, distinguishing an original claim from an interim, a replacement, or a void. (Ch.26)

Revenue code — a four-digit code identifying the department or cost center that provided a service or item. Says where; a HCPCS code says what. (Ch.26)

Condition code — a code reporting a circumstance that is true of the claim. (Ch.26)

Occurrence code — a code reporting the date something happened. (Ch.26)

Occurrence span code — a code reporting a date range. (Ch.26)

Value code — a code reporting an amount, including counts such as covered days. (Ch.26)

Patient discharge status — FL 17; where the patient went at the end of the stay. (Ch.26)

Transfer rule — the payment rule under which a hospital that transfers rather than discharges may be paid a per diem rather than the full DRG. (Ch.26)

Statement covers period — FL 6; the from and through dates for the services on the claim. (Ch.26)

Three-day payment window — the rule bundling hospital outpatient services furnished within three days before an admission into the inpatient claim. (Ch.26)

Principal diagnosis — FL 67's first-listed diagnosis; the condition chiefly responsible for the encounter. (Ch.26)

Admitting diagnosis — FL 69; the diagnosis at the time of admission, which may differ from the principal diagnosis. (Ch.26)

Patient control number — FL 3a; the facility's identifier for this claim or account, returned by the payer on the remittance so the payment can be posted. (Ch.26)

Medical record number — FL 3b; the facility's identifier for this patient across all encounters. (Ch.26)

Non-covered charges — FL 48; charges reported on the claim that the payer is not being asked to pay. (Ch.26)

Attending provider — FL 76; the clinician with primary responsibility for the patient during the stay. Required on virtually every claim. (Ch.26)

Operating provider — FL 77; the surgeon, conditionally required when a procedure is reported in FL 74. (Ch.26)

Remarks — FL 80; the free-text field, and frequently where the truth sits. (Ch.26)

Spaced Review

1. Give the UB-04's two names, its electronic equivalent, the committee that maintains it, and what its fields are called. Contrast each with Chapter 25's form.

2. Why do institutions bill differently? Name the three consequences for the claim.

3. Read 0131 digit by digit.

4. What does a frequency digit of 7 mean? Of 8? (Chapter 25) What is the professional-claim equivalent of getting this wrong?

5. What does a revenue code say that a HCPCS code does not? Give five revenue codes and their departments.

6. When is a HCPCS code required on a facility claim and when is it generally not? Explain why, naming the payment systems.

7. Sort these into the four circumstance families: a date of injury · four covered days · a qualifying stay from March 2 to March 5 · an inpatient admission changed to outpatient before discharge.

8. What does FL 17 report? State the transfer rule and both directions of getting it wrong.

9. What are the three rules of the statement-covers period?

10. State the three-day payment window. Why is "the outpatient claim was correct" not a defense?

11. (Chapter 23) Northgate is acquired and converted to a provider-based department. Name everything that changes about the professional claim, and everything that appears.

12. State the order in which to read a UB-04, and say what comes last.

13. Distinguish FL 3a from FL 3b. What breaks when they are confused, and which chapter's process depends on the answer?

14. Name the three fields that hold diagnoses and the question each answers. Why is it a warning sign when two of them are always identical?

15. What does FL 48 report? Why is omitting a known non-covered charge worse than reporting it?

16. Name the four provider fields and what each is for. Which is conditionally required, and on what condition?

17. A claim's FL 17 says 01 and FL 80's remark says the patient went to a rehabilitation facility. Name the error, the correct value, and the payment direction.

18. (Chapter 23) Northgate converts to a provider-based department. The professional allowed amount falls from \$216.28 to \$148.60 and a facility claim of \$212.40 appears. What happens to the total, to the patient's share, and why is the second one the part that matters?