ICD-10 Code C84.0A – Mycosis fungoides, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.0A – Mycosis fungoides, in remission
What it is
This code identifies a history of mycosis fungoides that is currently in remission. Use it when the lymphoma is not active, but the patient still carries the diagnosis.
Clinical signs
Clinical features vary; refer to documentation. In remission, active skin lesions, plaques, or tumors are absent or improved, and records should support the remission status.
When to use this code
Use this code when the provider documents mycosis fungoides as in remission, including follow-up visits after treatment or surveillance encounters. Confirm that the chart clearly states remission rather than active disease, stable disease, or history only.
Do not use for
Do not use this code for active mycosis fungoides or when remission is not documented. If the note only says “history of” or is unclear, check documentation.
Coding tip
Match the code to the provider’s exact wording, and do not infer remission from improvement alone.