K12
⚠ Non-billable
Stomatitis and related lesions
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K12
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- cancrum oris (A69.0)
- cheilitis (K13.0)
- gangrenous stomatitis (A69.0)
- herpesviral [herpes simplex] gingivostomatitis (B00.2)
- noma (A69.0)
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?
ICD-10-CM code K12 represents Stomatitis and related lesions. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K12 billable?
No. K12 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K12 in?
K12 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K12 category
K12.0
Recurrent oral aphthae
Billable
K12.1
Other forms of stomatitis
Billable
K12.2
Cellulitis and abscess of mouth
Billable
K12.3
Oral mucositis (ulcerative)
Non-billable
K12.30
Oral mucositis (ulcerative), unspecified
Billable
K12.31
Oral mucositis (ulcerative) due to antineoplastic therapy
Billable
K12.32
Oral mucositis (ulcerative) due to other drugs
Billable
K12.33
Oral mucositis (ulcerative) due to radiation
Billable
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