K12: Stomatitis and related lesions

Codes under K12 (Stomatitis and related lesions). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
K12.0	Recurrent oral aphthae	✓
K12.1	Other forms of stomatitis	✓
K12.2	Cellulitis and abscess of mouth	✓
K12.3	Oral mucositis (ulcerative)	—
K12.30	Oral mucositis (ulcerative), unspecified	✓
K12.31	Oral mucositis (ulcerative) due to antineoplastic therapy	✓
K12.32	Oral mucositis (ulcerative) due to other drugs	✓
K12.33	Oral mucositis (ulcerative) due to radiation	✓
K12.39	Other oral mucositis (ulcerative)	✓

More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees

Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

Code the diagnosis right