ICD-10 Code K12.32 – Oral mucositis (ulcerative) due to other drugs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K12.32 – Oral mucositis (ulcerative) due to other drugs
What it is
K12.32 identifies ulcerative inflammation of the oral mucosa caused by a medication or drug exposure other than the agents named in other specific codes. It describes a drug-related mouth injury with ulceration.
Clinical signs
Typical findings include painful oral ulcers, mucosal redness, and inflammation that begin after drug exposure. Clinical features vary; refer to documentation for the specific medication and whether ulceration is confirmed.
When to use this code
Use this code when the record clearly links ulcerative oral mucositis to a drug and the cause is documented as “other drugs.” It fits cases where the clinician identifies medication-induced mouth ulceration rather than infection, trauma, or a different oral disorder. Check documentation if the causative drug is not specified.
Do not use for
Do not use it for oral mucositis from radiation, chemotherapy agents with their own code, or non-ulcerative mouth irritation. If the chart does not confirm a drug cause, choose a different diagnosis or check documentation.
Coding tip
Link the code only when the provider documents both ulcerative mucositis and a drug cause; otherwise, query for clarification.