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K12.3

⚠ Non-billable (Header)

Oral mucositis (ulcerative)

Diseases of the digestive system (K00-K95)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Mucositis (oral) (oropharyneal)

❌ Excludes1

inherited from K12

Rules from parent category K12: Stomatitis and related lesions

  • • cancrum oris (A69.0)
  • • cheilitis (K13.0)
  • • gangrenous stomatitis (A69.0)
  • • herpesviral [herpes simplex] gingivostomatitis (B00.2)
  • • noma (A69.0)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

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

📋 Code Instructions

from K12
  • • 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)

Child Codes (5)

K12.30Oral mucositis (ulcerative), unspecifiedK12.31Oral mucositis (ulcerative) due to antineoplastic therapyK12.32Oral mucositis (ulcerative) due to other drugsK12.33Oral mucositis (ulcerative) due to radiationK12.39Other oral mucositis (ulcerative)

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Code Information

CodeK12.3
BillableNo — Header code
ParentK12
CategoryDiseases of the digestive system (K00-K95)
Excludes15 rule(s)
Excludes23 note(s)
Child codes5

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)