ICD-10-CM 2027
ICD-10 code for fungoides mycosis
From the official ICD-10-CM alphabetic index entry “Mycosis, mycotic › fungoides (extranodal) (solid organ)”. Page updated September 29, 2026.
About coding fungoides mycosis
The ICD-10-CM code for fungoides mycosis is C84.0 (Mycosis fungoides).
Within C84 (mature T/NK-cell lymphomas), C84.0 is specifically for mycosis fungoides. Related codes cover Sezary disease (C84.1), peripheral T-cell lymphoma, not elsewhere classified (C84.4), Anaplastic large cell lymphoma, ALK-positive (C84.6), Anaplastic large cell lymphoma, ALK-negative (C84.7), unspecified (C84.9), cutaneous T-cell lymphoma, unspecified (C84.A) and other mature T/NK-cell lymphomas (C84.Z).
To report this condition, pick the subcode that matches the documentation: C84.00 (unspecified site), C84.01 (lymph nodes of head, face, and neck), C84.02 (intrathoracic lymph nodes), C84.03 (intra-abdominal lymph nodes), C84.04 (lymph nodes of axilla and upper limb), C84.05 (lymph nodes of inguinal region and lower limb), C84.06 (intrapelvic lymph nodes), C84.07 (spleen) and 3 more.
Don't report C84.0 together with the conditions in its Excludes1 note: peripheral T-cell lymphoma, not elsewhere classified (C84.4-).
Don't confuse with (Excludes1 for C84.0)
- peripheral T-cell lymphoma, not elsewhere classified (C84.4-)