ICD-10-CM 2027
ICD-10 code for stomatitis
From the official ICD-10-CM alphabetic index entry “Stomatitis (denture) (ulcerative)”. Page updated September 29, 2026.
About coding stomatitis
The ICD-10-CM code for stomatitis is K12.1 (Other forms of stomatitis). The official index lists 32 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K12.1.
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.
More specific stomatitis codes (official index)
- angular K13.0 — Diseases of lips
- due to dietary or vitamin deficiency E53.0 — Riboflavin deficiency
- aphthous K12.0 — Recurrent oral aphthae
- bovine B08.61 — Bovine stomatitis
- candidal B37.0 — Candidal stomatitis
- catarrhal K12.1 — Other forms of stomatitis
- diphtheritic A36.89 — Other diphtheritic complications
- due to
- dietary deficiency E53.0 — Riboflavin deficiency
- thrush B37.0 — Candidal stomatitis
- vitamin deficiency
- B group NEC E53.9 — Vitamin B deficiency, unspecified
- B2 (riboflavin) E53.0 — Riboflavin deficiency
- epidemic B08.8 — Other specified viral infections characterized by skin and mucous membrane lesions
- epizootic B08.8 — Other specified viral infections characterized by skin and mucous membrane lesions
- follicular K12.1 — Other forms of stomatitis
- gangrenous A69.0 — Necrotizing ulcerative stomatitis
- Geotrichum B48.3 — Geotrichosis
- herpesviral, herpetic B00.2 — Herpesviral gingivostomatitis and pharyngotonsillitis
- herpetiformis K12.0 — Recurrent oral aphthae
- malignant K12.1 — Other forms of stomatitis
- membranous acute K12.1 — Other forms of stomatitis
- monilial B37.0 — Candidal stomatitis
- mycotic B37.0 — Candidal stomatitis
- necrotizing ulcerative A69.0 — Necrotizing ulcerative stomatitis
- parasitic B37.0 — Candidal stomatitis
- septic K12.1 — Other forms of stomatitis
- spirochetal A69.1 — Other Vincent's infections
- suppurative (acute) K12.2 — Cellulitis and abscess of mouth
- ulceromembranous A69.1 — Other Vincent's infections
- vesicular K12.1 — Other forms of stomatitis
- with exanthem (enteroviral) B08.4 — Enteroviral vesicular stomatitis with exanthem
- virus disease A93.8 — Other specified arthropod-borne viral fevers
- Vincent's A69.1 — Other Vincent's infections
Don't confuse with (Excludes1 for K12.1)
Common questions about stomatitis ICD-10 codes
What is the ICD-10 code for stomatitis?
- K12.1 — Other forms of stomatitis. More specific codes apply when the documentation supports them: K13.0, E53.0, K12.0, B08.61 and others below.
What is the ICD-10 code for angular stomatitis?
- K13.0 — Diseases of lips.
What is the ICD-10 code for aphthous stomatitis?
- K12.0 — Recurrent oral aphthae.
What is the ICD-10 code for bovine stomatitis?
- B08.61 — Bovine stomatitis.
What is the ICD-10 code for candidal stomatitis?
- B37.0 — Candidal stomatitis.
What is the ICD-10 code for catarrhal stomatitis?
- K12.1 — Other forms of stomatitis.
What is the ICD-10 code for diphtheritic stomatitis?
- A36.89 — Other diphtheritic complications.
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.