K12 – Stomatitis and related lesions
ICD-10-CM 2027 diagnosis code · Diseases of oral cavity and salivary glands
ICD-10-CM code
K12
- Code
K12(claims format:K12)- Description
- Stomatitis and related lesions
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K00-K14 Diseases of oral cavity and salivary glands
Billable codes under K12
K12 is a header code and cannot be used on claims. Choose the most specific code:
- K12.0 – Recurrent oral aphthaeBillable
- K12.1 – Other forms of stomatitisBillable
- K12.2 – Cellulitis and abscess of mouthBillable
- K12.3 – Oral mucositis (ulcerative)Header (more codes below)
Notes for K12
Excludes1 (not coded here):
Use additional code:
- 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)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
Frequently asked questions
What is ICD-10 code K12?
K12 is the ICD-10-CM code for stomatitis and related lesions, in the block K00-K14 (Diseases of oral cavity and salivary glands).
Is K12 a billable code?
No. K12 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.