C82 vs C84

C82 (Follicular lymphoma) compared with C84 (Mature T/NK-cell lymphomas), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. C82 carries an Excludes1 note covering C84: “mature T/NK-cell lymphomas (C84.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	C82Follicular lymphoma	C84Mature T/NK-cell lymphomas
Billing status	Non-billable header Report instead: C82.00, C82.01, C82.02, C82.03, C82.04	Non-billable header Report instead: C84.00, C84.01, C84.02, C84.03, C84.04
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Follicular lymphoma is a non-billable ICD-10-CM category code (C82).	Mature T/NK-cell lymphomas is a non-billable ICD-10-CM category code (C84).
Includes	follicular lymphoma with or without diffuse areas	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources