ICD-10-CM 2027
ICD-10 code for oral mucosa lesion
From the official ICD-10-CM alphabetic index entry “Lesion (s) (nontraumatic) › oral mucosa”. Page updated September 29, 2026.
About coding oral mucosa lesion
The ICD-10-CM code for oral mucosa lesion is K13.70 (Unspecified lesions of oral mucosa).
Within K13.7, choose K13.70 (Unspecified lesions of oral mucosa) only when documentation doesn't support a more specific option: other lesions of oral mucosa (K13.79).
Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about oral mucosa lesion ICD-10 codes
What is the ICD-10 code for oral mucosa lesion?
- K13.70 — Unspecified lesions of oral mucosa.
Is K13.70 billable?
- Yes. K13.70 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K13.70 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K13.70 as a principal diagnosis.
Is K13.70 a CC or MCC?
- No. K13.70 is neither a CC nor an MCC under MS-DRG v44.0.