What the FY 2027 release contains
The dataset behind this site is the official CMS ICD-10-CM tabular list and codes file for FY 2027: 98,161 codes across 22 chapters, of which 74,465 are billable. The annual update works the same way every year — the tabular list is amended at category, subcategory and code level, and the addenda record exactly what was added, revised or deleted.
New codes
New codes appear where the previous release had no way to capture a distinct clinical concept. They usually arrive as a new subcategory or as extra options inside an existing one. Examples from the FY 2027 addenda include:
- C78.31 Secondary malignant neoplasm of larynx, and C78.32 Secondary malignant neoplasm of pharynx — the secondary neoplasms of the head and neck are now more specific than before.
- C79.83 Secondary malignant neoplasm of oral cavity.
- D69.11 Glanzmann thrombasthenia and D69.19 Other qualitative platelet defects — a family of platelet defects now coded in detail.
- E89.83 Postprocedural hypoglycemia following a procedure, with E89.830 Post bariatric hypoglycemia and E89.838 Other postprocedural hypoglycemia.
- F64.A Gender identity disorder, in remission.
- I42.00 Dilated cardiomyopathy, unspecified, plus I42.01 Familial-genetic dilated cardiomyopathy and I42.09 Other dilated cardiomyopathy — splitting a previously single header into specific options.
Two patterns are worth noting. First, a new header often arrives with its own specific children, which means the correct code for existing documentation may have changed even though the clinical picture has not. Second, added codes frequently replace a "not elsewhere classified" or "unspecified" option that coders were previously forced to use.
Revised descriptions and notes
Revisions are quieter than additions and easier to miss, but they change what a code formally means. The addenda for FY 2027 include terminology corrections and changes to the Excludes and Includes notes attached to existing codes:
- E29.1 — the description changed from "5-delta-Reductase deficiency" to "5-Alpha-reductase deficiency". The code is unchanged; the words are now correct.
- D68.09 — the Includes note changed from "qualitative platelet defects (D69.1)" to "qualitative platelet defects (D69.1-)". The trailing dash matters: it means the whole D69.1 category, not one specific code.
- E74.05 and F02 — both had excludes references corrected, one to a category range (I42.0-) and one to a wrong code (G31.90 became G31.09).
That third bullet is the one that bites. A cross-reference pointing at the wrong code sends you to the wrong place in the tabular list, and nothing about the code you were originally looking at looks wrong.
Deleted codes
Deleted codes are removed because the concept they described no longer exists as a distinct entry, or because it was replaced outright. A deleted code is not merely invalid for new claims — reporting it will fail validation. If your templates, favourites or EHR pick-lists still carry codes from the previous release, that is where the stale entries hide.
Seventh-character requirements
Categories that need a 7th character keep that requirement in FY 2027, and new subcategories sometimes inherit it. Injury, poisoning and certain other consequences of external causes (chapter 19) and external causes of morbidity (chapter 20) are the usual suspects. Where a 7th character is required, the code is not billable without it, and the choice between initial encounter, subsequent encounter and sequela has to come from the documentation, not from habit.
What to do about it
- Retire last year's code list. Rebuild or re-import any local code set from the FY 2027 data. Every code page here links back to the official tabular list so you can confirm the current wording.
- Re-check your high-volume codes. Open the codes you use most and confirm the description, billable status and Excludes notes still say what you expect.
- Review your top denials. Look at the specific codes behind them and check whether a new, more specific option now exists.
- Update templates and pick-lists. This is the single most common source of invalid codes after an October release.
- Brief the team on the quiet changes. Vocabulary corrections and cross-reference fixes are the ones that cause arguments about "the code changed" when it did not.
Where to look up a specific code
- Changes — the full FY 2027 addenda, grouped by chapter, showing every added, revised and deleted entry.
- ICD-10 Codes — browse all 22 chapters, or filter to billable codes and codes needing a 7th character.
- A–Z Index — find a code by the condition name when you are not sure of the category.
- Coding Guidelines — the official FY 2027 guidelines, chapter by chapter.