K12.33 Oral mucositis (ulcerative) due to radiation
Billable ICD-10-CM code, FY2026.
Use additional code
- external cause code (W88-W90, X39.0-) to identify cause
Applies from K12 Stomatitis and related lesions
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)
Applies from K12.3 Oral mucositis (ulcerative)
Applicable to
- Mucositis (oral) (oropharyneal)
Excludes2 (not included here)
- gastrointestinal mucositis (ulcerative) (K92.81)
- mucositis (ulcerative) of vagina and vulva (N76.81)
- nasal mucositis (ulcerative) (J34.81)
MS-DRG index
Defines the logic of DRG(s) 011-013 in MDC PRE.
Approximate ICD-9-CM (GEMs)
528.01 Mucositis (ulcerative) due to antineoplastic therapy (approximate)
Code annotations containing back-references to K12.33
Back-references to K12.3
- Code Also:
D70 Neutropenia (", if applicable, mucositis (J34.81, K12.3-, K92.81, N76.81)") - Type 2 Excludes:
J34.81 Nasal mucositis (ulcerative) ("oral mucositis (ulcerative) (K12.3-)") - Type 2 Excludes:
K92.81 Gastrointestinal mucositis (ulcerative) ("oral mucositis (ulcerative) (K12.3-)") - Type 2 Excludes:
N76.81 Mucositis (ulcerative) of vagina and vulva ("oral mucositis (ulcerative) (K12.3-)")
Back-references to K12
- Type 2 Excludes:
K13 Other diseases of lip and oral mucosa ("stomatitis and related lesions (K12.-)") - Use Additional:
L51 Erythema multiforme ("stomatitis (K12.-)")
Diagnosis Index entries for K12.33
- Mucositis (ulcerative) › mouth (oral) (oropharyngeal) › due to radiation
Nearby codes
K12.2 Cellulitis and abscess of mouthK12.3 Oral mucositis (ulcerative)K12.30 Oral mucositis (ulcerative), unspecifiedK12.31 Oral mucositis (ulcerative) due to antineoplastic therapyK12.32 Oral mucositis (ulcerative) due to other drugsK12.33 Oral mucositis (ulcerative) due to radiation (this code)K12.39 Other oral mucositis (ulcerative)