Mycosis fungoides, unspecified site

This code identifies a specific type of cutaneous T-cell lymphoma, Mycosis Fungoides, which primarily affects the skin. It is characterized by patches, plaques, and tumors that can progress to erythroderma and internal organ involvement in advanced stages. The "unspecified site" indicates that the primary location of the disease is not documented or is generalized.

Use this code when the medical record clearly documents a diagnosis of Mycosis Fungoides without specifying a particular anatomical site of involvement. This is appropriate for initial diagnoses where the extent of disease is still being evaluated or for generalized presentations. Documentation should confirm the histological diagnosis of Mycosis Fungoides.

• Do not use this code if a specific site of Mycosis Fungoides is documented; instead, choose a more precise code from the C84.0 subcategory.
• Always sequence this code as the primary diagnosis when Mycosis Fungoides is the reason for the encounter.
• Ensure the documentation supports the "unspecified site" by either explicitly stating it or by lacking any mention of a specific anatomical location.