ICD-10-CM 2027
ICD-10 code for stomatitis ulcer
From the official ICD-10-CM alphabetic index entry “Ulcer, ulcerated, ulcerating, ulceration, ulcerative › stomatitis”. Page updated September 29, 2026.
About coding stomatitis ulcer
The ICD-10-CM code for stomatitis ulcer is K12.1 (Other forms of stomatitis).
Within K12, choose K12.1 (Other forms of stomatitis) only when documentation doesn't support a more specific option: recurrent oral aphthae (K12.0), cellulitis and abscess of mouth (K12.2) and oral mucositis (ulcerative) (K12.3).
Don't report K12.1 together with the conditions in its Excludes1 note: acute necrotizing ulcerative stomatitis (A69.1) and Vincent's stomatitis (A69.1).
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.
Don't confuse with (Excludes1 for K12.1)
Common questions about stomatitis ulcer ICD-10 codes
What is the ICD-10 code for stomatitis ulcer?
- K12.1 — Other forms of stomatitis.
Is K12.1 billable?
- Yes. K12.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K12.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K12.1 as a principal diagnosis.
Is K12.1 a CC or MCC?
- No. K12.1 is neither a CC nor an MCC under MS-DRG v44.0.