K12.3
⚠ Non-billable
Oral mucositis (ulcerative)
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K12.3
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.
Frequently asked questions
What is ICD-10 code K12.3?
ICD-10-CM code K12.3 represents Oral mucositis (ulcerative). 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 K12.3 billable?
No. K12.3 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K12.3 in?
K12.3 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K12 category
K12
Stomatitis and related lesions
Non-billable
K12.0
Recurrent oral aphthae
Billable
K12.1
Other forms of stomatitis
Billable
K12.2
Cellulitis and abscess of mouth
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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