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K12.33

✓ Billable

Oral mucositis (ulcerative) due to radiation

Diseases of the digestive system (K00-K95)

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📋 Code Instructions

  • • external cause code (W88-W90, X39.0-) to identify cause

⚠️ Excludes2

inherited from K12.3

Rules from parent category K12.3: Oral mucositis (ulcerative)

  • • gastrointestinal mucositis (ulcerative) (K92.81)
  • • mucositis (ulcerative) of vagina and vulva (N76.81)
  • • nasal mucositis (ulcerative) (J34.81)

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Code Information

CodeK12.33
BillableYes
ParentK12.3
CategoryDiseases of the digestive system (K00-K95)
Excludes10 rule(s)
Excludes23 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)