C84
⚠ Non-billable
Mature T/NK-cell lymphomas
ICD-10-CM · FY2026 · Neoplasms
Code
C84
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Neoplasms
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code C84?
ICD-10-CM code C84 represents Mature T/NK-cell lymphomas. It is a non-billable header code requiring a more specific subcategory in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.
Is C84 billable?
No. C84 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is C84 in?
C84 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.
Related codes in the C84 category
C84.0
Mycosis fungoides
Non-billable
C84.1
Sezary disease
Non-billable
C84.4
Peripheral T-cell lymphoma, not elsewhere classified
Non-billable
C84.6
Anaplastic large cell lymphoma, ALK-positive
Non-billable
C84.7
Anaplastic large cell lymphoma, ALK-negative
Non-billable
C84.A
Cutaneous T-cell lymphoma, unspecified
Non-billable
C84.Z
Other mature T/NK-cell lymphomas
Non-billable
C84.9
Mature T/NK-cell lymphomas, unspecified
Non-billable
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