K12.33
✓ Billable
Oral mucositis (ulcerative) due to radiation
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K12.33
System
ICD-10-CM
Billable
Yes — valid for submission
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 K12.33?
ICD-10-CM code K12.33 represents Oral mucositis (ulcerative) due to radiation. It is a billable diagnosis code in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K12.33 billable?
Yes. K12.33 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is K12.33 in?
K12.33 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
K12.3
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
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