NPI Atlas

ICD-10 Code for Mucositis

The default ICD-10-CM 2027 code for mucositis (ulcerative) is K12.30 – Oral mucositis (ulcerative), unspecified. More specific codes depend on the details documented, as listed in the official index (8 codes, 8 billable).

Main code: K12.30 – Oral mucositis (ulcerative), unspecified
Billable: Yes

Index entries for Mucositis

due to drugs NEC – K12.32
gastrointestinal – K92.81
mouth (oral) (oropharyngeal) – K12.30
- due to antineoplastic therapy – K12.31
- due to drugs NEC – K12.32
- due to radiation – K12.33
- specified NEC – K12.39
- viral – K12.39
nasal – J34.81
oral cavity – see Mucositis, mouth
oral soft tissues – see Mucositis, mouth
vagina and vulva – N76.81

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.