Oral mucositis (ulcerative) due to antineoplastic therapy

This code signifies inflammation and ulceration of the oral mucous membranes specifically caused by antineoplastic (chemotherapy or radiation) treatment. It presents as painful sores, redness, and swelling throughout the mouth, often severely impacting a patient's ability to eat, drink, and speak.

Apply this code when documentation clearly states oral mucositis, stomatitis, or ulceration of the oral cavity is a direct adverse effect of cancer therapy. The medical record must specify the antineoplastic agent or radiation as the causative factor.

• Always sequence this code after the code for the underlying neoplasm and the adverse effect of the antineoplastic therapy (e.g., T45.1X5A for adverse effect of antineoplastic and immunosuppressive drugs).
• Do not use this code for oral mucositis due to other causes; specific codes exist for infectious, traumatic, or idiopathic oral mucositis.
• Ensure the documentation explicitly links the mucositis to the antineoplastic treatment, rather than just stating "oral mucositis" in a patient undergoing cancer therapy.