Chapter 6 — Key Takeaways
Three books, three questions, three cycles
| Book | Answers | Maintained by | Changes |
|---|---|---|---|
| ICD-10-CM | What was wrong with the patient? | NCHS / CMS | October 1 |
| CPT (HCPCS Level I) | What did the provider do? | AMA | January 1 |
| HCPCS Level II | What was supplied or administered? | CMS | quarterly |
Plus ICD-10-PCS — inpatient hospital procedures only.
The most valuable part of CPT is the section and subsection guidelines, which change the meaning of every code beneath them and which most coders skip.
ICD-10-CM and HCPCS Level II are free at the source. CPT is not — the AMA owns it.
Setting up a book
Tab what you navigate to, not what you look up. Guidelines, tables, appendices, chapters. You reach codes through the index; you reach everything else directly.
Exam rules (verify with your credentialing body before your exam date): handwritten notes, highlighting, and tabs are generally fine. Taped, glued, or printed inserts are generally not.
Write it, do not print it.
What an encoder does not decide
- Whether the documentation supports the code — it has not read the note
- Which of two defensible codes better fits
- Whether a query is needed
- Whether a convention was correctly applied (it catches hard conflicts, not judgment)
- Whether the code you entered is the code you meant
Verify encoder output in the tabular. The two-step rule does not stop applying because step one was a screen.
Systems
| Owns | |
|---|---|
| EHR | the clinical record — notes, orders, results, problem list, audit trail |
| PMS | the financial record — demographics, insurance, charges, claims, payments, AR |
| Scrubber | pre-submission edits |
| Clearinghouse | validation, routing, acknowledgments, remittances |
The coder reads left and writes right. The interface between them is where charges disappear.
A scrubber rule that corrects claims automatically, without review, is the highest-risk object in a billing system. Inventory them. Half a day. Read ten claims of output.
The routing table
| Question | Source |
|---|---|
| Is this ICD-10-CM code valid, and what governs it? | the Tabular List + the Official Guidelines |
| Does Medicare cover it? | Medicare Coverage Database → LCD → its billing and coding article |
| What does it pay? | Physician Fee Schedule lookup |
| Can these be billed together? | NCCI PTP edits + Policy Manual |
| How many units? | MUE table |
| How is the claim completed? | 100-04; NUCC manual for the 1500 |
| What will an auditor apply? | 100-08 |
| Local policy? | your own MAC |
| What's under scrutiny? | OIG Work Plan |
| Medicaid? | your state's provider manual |
Three search techniques: search by code, not concept · go to the article, not just the policy · check the effective date against the date of service.
The coder's year
- January 1 — CPT; conversion factor and fee schedule
- October 1 — ICD-10-CM and the Official Guidelines; the inpatient payment year
- Quarterly — HCPCS Level II, NCCI edits, MUEs
- Continuously — LCDs and payer policy, with no announcement
Before: order books, read the summary of changes, review the superbill, check whether a guideline changed — not just the codes. On the date: confirm encoder, PMS, and scrubber are all updated. Three separate updates. After: watch the two-week rejection spike. That is your update audit.
A code is assigned according to the code set in effect on the DATE OF SERVICE. In the first two weeks of January and October, check the date before you open anything.
Queues, productivity, quality
A good queue contains only actionable items, ordered by urgency, with visible aging and a defined exit. Coding queues sort by date of service (charge lag). Billing queues sort by deadline.
The honest tension: productivity and accuracy pull against each other.
Any metric that can be improved by looking less carefully needs a quality metric of equal weight beside it. A productivity standard that cannot be met accurately is a compliance problem, not a performance problem.
The three habits
- Notice "I think it's…" — that phrase is the signal. Forty seconds.
- Keep a question file, not a code list. It becomes the most useful document in your department and your best exam preparation.
- Read one primary source per month. Twenty minutes. The difference between knowing what the rules are and knowing what they say — and in a dispute, the second one wins.
Key terms
code book · HCPCS Level I / Level II · encoder · grouper · practice management system · EHR · clearinghouse · scrubber · work queue · annual update cycle · crosswalk · superbill · charge lag
Monday morning
You should be able to:
- Say which of five sources answers a given question, in under ten seconds.
- Tab a code book so the guidelines are one motion away.
- Verify an encoder's output instead of trusting it.
- Ask a billing office the three scrubber questions, and know what it means when nobody can answer.
- Check the date of service before opening a book, in the first two weeks of January and October.
The Encounter: you now have a thirteen-row routing table for Account 10-4471 — every question the file will raise, the source that answers it, and the chapter that does the work.
Row 2's answer is "the note, nothing else," and every other row depends on it. Row 13 — the appeal that wins \$128.40 — is built from three documents, none of which cost anything and all of which were available on day 1.