The 2027 code books
Everything on this site is free to look up online, and for most single-code questions that is the faster route. The printed books still earn their shelf space: coders annotate them, exams and audits expect the official volumes, and a book never has a dead battery in a chart review. These are the current editions for the 2027 code year.
AAPC
The diagnosis book for the FY2027 code year (October 1, 2026 to September 30, 2027). The Expert editions add coding tips, guideline summaries and color coding for specificity and 7th characters on top of the full tabular list. Every coder, biller and practice that reports diagnoses needs the current year; last year's book is a denial risk.
AAPC
The inpatient procedure book for FY2027: all 7-character PCS codes with the tables they are built from, plus definitions of the root operations. Hospital inpatient coders live in this one; it is the companion to the CM volume, not a substitute for it.
American Medical Association
The official CPT book, published by the AMA, which owns the code set. CPT 2027 runs on the calendar year (January 1 to December 31, 2027). This site cannot republish CPT descriptions because they are licensed; the printed Professional edition is the standard way offices keep the current set, guidelines and modifiers at hand.
AAPC
The 2027 Level II book: drugs, supplies, DME, ambulance and the services CPT does not cover, with the modifiers. Level II updates quarterly, and the annual book is the baseline coders annotate through the year. Pairs with the free HCPCS lookup on this site.
AHA Central Office (American Hospital Association)
The teaching companion to the two ICD-10 books: official guidance explained chapter by chapter, with worked examples and exercises. Students and hospital coding departments use it to learn the guidelines behind the codes rather than just the codes themselves.
Which books do you actually need?
- Physician office or clinic billing: ICD-10-CM, CPT Professional and HCPCS Level II. Diagnoses, procedures and supplies: the three sets that appear on a professional claim.
- Hospital inpatient coding: ICD-10-CM and ICD-10-PCS, plus the AHA Coding Handbook for the guidelines and worked examples behind them.
- Students: start with the book for the code set your course covers, and add the AHA Handbook if it is ICD-10; its exercises mirror how the guidelines are actually tested.
Editions matter: FY2027 ICD-10 codes took effect October 1, 2026, and CPT and HCPCS 2027 run from January 1, 2027. A book from the wrong year is worse than no book, because the codes look almost identical.
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