ICD-10 Code for Mucositis
Also indexed as (ulcerative)
The ICD-10-CM code for mucositis is K12.30 — Oral mucositis (ulcerative), unspecified. This is the code the Alphabetic Index gives for mucositis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
K12.30 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which mucositis code should you use?
The Alphabetic Index lists 8 codes under Mucositis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
Mucositis mouth
| due to antineoplastic therapy | K12.31 | Oral mucositis (ulcerative) due to antineoplastic therapy | |
| due to drugs NEC | K12.32 | Oral mucositis (ulcerative) due to other drugs | |
| due to radiation | K12.33 | Oral mucositis (ulcerative) due to radiation | |
| specified NEC | K12.39 | Other oral mucositis (ulcerative) | |
| viral | K12.39 | Other oral mucositis (ulcerative) |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources