K12.3 is the ICD-10 code for Oral mucositis (ulcerative). It is a four-character subcategory of K12 (Stomatitis and related lesions), the most specific level in the WHO edition. It belongs to the block K00–K14 (Diseases of oral cavity, salivary glands and jaws) in Chapter XI, Diseases of the digestive system.
- Code type
- Subcategory (4 characters)
- Chapter
- XI · K00–K93
- Classification
- WHO ICD-10, 2019 version
What K12.3 includes
Conditions and terms that are coded here.
- Mucositis(oral) (oropharyngeal):
- NOS
- drug-induced
- radiation induced
- viral
- Use additional external cause code (Chapter XX), if desired, to identify external agent
What K12.3 excludes
Conditions that look similar but belong under another code.
- mucositis (ulcerative) of gastrointestinal tract (except oral cavity and oropharynx) K92.8
K12.3 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
K12.3Oral mukositt
K12.3Orale Mukositis (ulzerativ)
K12.3Mucite buccale (ulcéreuse)
K12.3orale mucositis (ulceratief)
Listed through more specific codes:
- K12.30Oral mucositis (ulcerative), unspecified
- K12.31Oral mucositis (ulcerative) due to antineoplastic therapy
- K12.32Oral mucositis (ulcerative) due to other drugs
- K12.33Oral mucositis (ulcerative) due to radiation
- K12.39Other oral mucositis (ulcerative)
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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