K12.3Header code — not billable
Oral mucositis (ulcerative)
- Chapter
- 11. Diseases of the digestive system
- Category
- K12
- Effective date
- October 1, 2026
Related codes in category K12
K12Stomatitis and related lesionsK12.0Recurrent oral aphthaeYesK12.1Other forms of stomatitisYesK12.2Cellulitis and abscess of mouthYesK12.30Oral mucositis (ulcerative), unspecifiedYesK12.31Oral mucositis (ulcerative) due to antineoplastic therapyYesK12.32Oral mucositis (ulcerative) due to other drugsYesK12.33Oral mucositis (ulcerative) due to radiationYesK12.39Other oral mucositis (ulcerative)Yes
Frequently asked questions
What is ICD-10 code K12.3?
K12.3 is an ICD-10-CM diagnosis code for Oral mucositis (ulcerative).
Is K12.3 a billable code?
No. K12.3 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is K12.3 in?
K12.3 falls under Chapter 11: Diseases of the digestive system.
When did K12.3 become effective?
K12.3 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to K12.3?
K12.3 belongs to category K12, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.