C84.09: Mycosis fungoides, extranodal and solid organ sites
C84.09 is the billable ICD-10-CM diagnosis code for Mycosis fungoides, extranodal and solid organ sites. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code C84.09?
C84.09 is the ICD-10-CM diagnosis code for Mycosis fungoides, extranodal and solid organ sites. It belongs to category C84 (Mature T/NK-cell lymphomas).
Is C84.09 a billable code?
Yes. C84.09 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does C84.09 belong to?
C84.09 is part of ICD-10-CM category C84 — Mature T/NK-cell lymphomas, which has 178 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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