Mycosis fungoides, lymph nodes of axilla and upper limb

This code describes Mycosis fungoides, a rare, slow-growing cutaneous T-cell lymphoma, specifically when it has spread to involve the lymph nodes located in the axilla (armpit) and/or upper limb. This indicates a more advanced stage of the disease beyond the skin.

Use this code when documentation confirms a diagnosis of Mycosis fungoides with confirmed involvement of the axillary or upper limb lymph nodes, typically through biopsy or imaging. This code is appropriate for staging and treatment planning for patients with nodal disease in these specific anatomical sites.

• Ensure documentation clearly specifies lymph node involvement in the axilla or upper limb; generalized lymphadenopathy without specific site confirmation is insufficient.
• Do not confuse with codes for Mycosis fungoides affecting other sites or codes for other types of T-cell lymphomas.
• Always sequence this code after the primary diagnosis code for Mycosis fungoides (e.g., C84.00, C84.01, etc.) if applicable, to indicate the specific site of metastasis or involvement.