ICD-10 Code for Mycosis
The ICD-10-CM code for mycosis is B49 — Unspecified mycosis. This is the code the Alphabetic Index gives for mycosis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
B49 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which mycosis code should you use?
The Alphabetic Index lists 10 codes under Mycosis, mycotic. 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
| cutaneous NEC | B36.9 | Superficial mycosis, unspecified | |
| ear | B36.9 | Superficial mycosis, unspecified | |
| fungoides | C84.0 | Mycosis fungoides | not billable |
| mouth | B37.0 | Candidal stomatitis | |
| nails | B35.1 | Tinea unguium | |
| opportunistic | B48.8 | Other specified mycoses | |
| skin NEC | B36.9 | Superficial mycosis, unspecified | |
| specified NEC | B48.8 | Other specified mycoses | |
| stomatitis | B37.0 | Candidal stomatitis | |
| vagina, vaginitis | B37.31 | Acute candidiasis of vulva and vagina |
Mycosis vagina, vaginitis
| chronic | B37.32 | Chronic candidiasis of vulva and vagina |
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