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C84.0

⚠ Non-billable (Header)

Mycosis fungoides

Neoplasms (C00-D49)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with C84.0

  • • peripheral T-cell lymphoma, not elsewhere classified (C84.4-)

❌ Excludes1

inherited from C84

Rules from parent category C84: Mature T/NK-cell lymphomas

  • • personal history of non-Hodgkin lymphoma (Z85.72)

Child Codes (11)

C84.00Mycosis fungoides, unspecified siteC84.01Mycosis fungoides, lymph nodes of head, face, and neckC84.02Mycosis fungoides, intrathoracic lymph nodesC84.03Mycosis fungoides, intra-abdominal lymph nodesC84.04Mycosis fungoides, lymph nodes of axilla and upper limbC84.05Mycosis fungoides, lymph nodes of inguinal region and lower limbC84.06Mycosis fungoides, intrapelvic lymph nodesC84.07Mycosis fungoides, spleenC84.08Mycosis fungoides, lymph nodes of multiple sitesC84.09Mycosis fungoides, extranodal and solid organ sitesC84.0AMycosis fungoides, in remission

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Code Information

CodeC84.0
BillableNo — Header code
ParentC84
CategoryNeoplasms (C00-D49)
Excludes12 rule(s)
Excludes20 note(s)
Child codes11

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)