ICD-10-CM K12.3: Oral mucositis (ulcerative)

ICD-10-CM Diagnosis Code (2025)

Official Description for K12.3

Oral mucositis (ulcerative)

Coding Notes & Guidelines for K12.3

Excludes2: Not Included Here
  • gastrointestinal mucositis (ulcerative) (K92.81)
  • mucositis (ulcerative) of vagina and vulva (N76.81)
  • nasal mucositis (ulcerative) (J34.81)
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code for adverse effect, if applicable, to identify antineoplastic and immunosuppressive drugs (T45.1X5)

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  • code for other antineoplastic therapy, such as:
  • radiological procedure and radiotherapy (Y84.2)
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code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

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external cause code (W88-W90, X39.0-) to identify cause

Inclusion Terms

Mucositis (oral) (oropharyneal)

Inclusion Terms

Viral oral mucositis (ulcerative)

Parent Code (Less Specific):

K12 - Stomatitis and related lesions

About ICD-10-CM Code K12.3 (Oral mucositis)

ICD-10-CM code K12.3 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM K12.3 became effective on October 1, 2024.

This page provides detailed information about K12.3 - Oral mucositis (ulcerative). It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Oral mucositis.