C84.9
Non-billableMature T/NK-cell lymphomas, unspecified
C84.9 is the ICD-10-CM code for Mature T/NK-cell lymphomas, unspecified. It is a non-billable category code — use a more specific child code such as C84.90 for billing.
C00-D49 Neoplasms
Includes
- •NK/T cell lymphoma NOS
Excludes1 — not coded here
- •mature T-cell lymphoma, not elsewhere classified (C84.4-)
Frequently asked questions
- What is ICD-10 code C84.9?
- C84.9 is the ICD-10-CM code for "Mature T/NK-cell lymphomas, unspecified". It falls under C00-D49 Neoplasms.
- Is C84.9 a billable code?
- No — C84.9 is a non-billable header code. Use a more specific child code (such as C84.90) for billing.
- What are the subcodes of C84.9?
- C84.9 has 11 more specific child codes, including C84.90, C84.91, C84.92.
- What is excluded from C84.9?
- Excludes1 (not coded here): mature T-cell lymphoma, not elsewhere classified (C84.4-).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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