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K12.3

Non-billable

Oral mucositis (ulcerative)

K12.3 is the ICD-10-CM code for Oral mucositis (ulcerative). It is a non-billable category code — use a more specific child code such as K12.30 for billing.

Status
Header (non-billable)
Chapter
K00-K95
Parent
K12
Subcodes
5
Edition
FY2026

K00-K95 Diseases of the digestive system

Includes

  • •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)

Frequently asked questions

What is ICD-10 code K12.3?
K12.3 is the ICD-10-CM code for "Oral mucositis (ulcerative)". It falls under K00-K95 Diseases of the digestive system.
Is K12.3 a billable code?
No — K12.3 is a non-billable header code. Use a more specific child code (such as K12.30) for billing.
What are the subcodes of K12.3?
K12.3 has 5 more specific child codes, including K12.30, K12.31, K12.32.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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