C84.Z Other mature T/NK-cell lymphomas

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Other mature T/NK-cell lymphomas is C84.Z (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
C81-C96: Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
Category C84
98 codes (89 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to C84.Z:

  • Lymphoma (of) (malignant) › mature T/NK-cell › specified NEC
Excludes1
Not coded here. These conditions should NOT be coded together with C84.Z.
  • angioimmunoblastic T-cell lymphoma (C86.50)
  • blastic NK-cell lymphoma (C86.40)
  • enteropathy-type T-cell lymphoma (C86.20)
  • extranodal NK-cell lymphoma, nasal type (C86.00)
  • hepatosplenic T-cell lymphoma (C86.10)
  • primary cutaneous CD30-positive T-cell proliferations (C86.60)
  • subcutaneous panniculitis-like T-cell lymphoma (C86.30)
  • T-cell leukemia (C91.1-)

Notes

  • If T-cell lineage or involvement is mentioned in conjunction with a specific lymphoma, code to the more specific description.

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.2.a
Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.2.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference C84.Z with the canonical source and edition:

C84.Z — Other mature T/NK-cell lymphomas. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C84.Z

Canonical URL: https://icd10codingpro.com/codes/C84.Z

Related Codes

Parent Code

C84 Mature T/NK-cell lymphomas

More Specific Codes

C84.Z0 Other mature T/NK-cell lymphomas, unspecified site C84.Z1 Other mature T/NK-cell lymphomas, lymph nodes of head, face, and neck C84.Z2 Other mature T/NK-cell lymphomas, intrathoracic lymph nodes C84.Z3 Other mature T/NK-cell lymphomas, intra-abdominal lymph nodes C84.Z4 Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb C84.Z5 Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb C84.Z6 Other mature T/NK-cell lymphomas, intrapelvic lymph nodes C84.Z7 Other mature T/NK-cell lymphomas, spleen C84.Z8 Other mature T/NK-cell lymphomas, lymph nodes of multiple sites C84.Z9 Other mature T/NK-cell lymphomas, extranodal and solid organ sites C84.ZA Other mature T/NK-cell lymphomas, in remission

Other Codes Under C84

C84.0 Mycosis fungoides C84.1 Sézary disease C84.4 Peripheral T-cell lymphoma, not elsewhere classified C84.6 Anaplastic large cell lymphoma, ALK-positive C84.7 Anaplastic large cell lymphoma, ALK-negative C84.9 Mature T/NK-cell lymphomas, unspecified C84.A Cutaneous T-cell lymphoma, unspecified
Search all 70,000+ ICD-10-CM codes →
Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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