C84 Mature T/NK-cell lymphomas

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Mature T/NK-cell lymphomas is C84 (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
Excludes1
Not coded here. These conditions should NOT be coded together with C84.
  • personal history of non-Hodgkin lymphoma (Z85.72)

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

Related Codes

More Specific Codes

C84.0 Mycosis fungoides C84.00 Mycosis fungoides, unspecified site C84.01 Mycosis fungoides, lymph nodes of head, face, and neck C84.02 Mycosis fungoides, intrathoracic lymph nodes C84.03 Mycosis fungoides, intra-abdominal lymph nodes C84.04 Mycosis fungoides, lymph nodes of axilla and upper limb C84.05 Mycosis fungoides, lymph nodes of inguinal region and lower limb C84.06 Mycosis fungoides, intrapelvic lymph nodes C84.07 Mycosis fungoides, spleen C84.08 Mycosis fungoides, lymph nodes of multiple sites C84.09 Mycosis fungoides, extranodal and solid organ sites C84.0A Mycosis fungoides, in remission C84.1 Sézary disease C84.10 Sézary disease, unspecified site C84.11 Sézary disease, lymph nodes of head, face, and neck C84.12 Sézary disease, intrathoracic lymph nodes C84.13 Sézary disease, intra-abdominal lymph nodes C84.14 Sézary disease, lymph nodes of axilla and upper limb C84.15 Sézary disease, lymph nodes of inguinal region and lower limb C84.16 Sézary disease, intrapelvic lymph nodes C84.17 Sézary disease, spleen C84.18 Sézary disease, lymph nodes of multiple sites C84.19 Sézary disease, extranodal and solid organ sites C84.1A Sézary disease, in remission C84.4 Peripheral T-cell lymphoma, not elsewhere classified C84.40 Peripheral T-cell lymphoma, not elsewhere classified, unspecified site C84.41 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck C84.42 Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes C84.43 Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes C84.44 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limb

Related Codes in C84

C84.0 Mycosis fungoides C84.00 Mycosis fungoides, unspecified site C84.01 Mycosis fungoides, lymph nodes of head, face, and neck C84.02 Mycosis fungoides, intrathoracic lymph nodes C84.03 Mycosis fungoides, intra-abdominal lymph nodes C84.04 Mycosis fungoides, lymph nodes of axilla and upper limb C84.05 Mycosis fungoides, lymph nodes of inguinal region and lower limb C84.06 Mycosis fungoides, intrapelvic lymph nodes C84.07 Mycosis fungoides, spleen C84.08 Mycosis fungoides, lymph nodes of multiple sites C84.09 Mycosis fungoides, extranodal and solid organ sites C84.0A Mycosis fungoides, in remission C84.1 Sézary disease C84.10 Sézary disease, unspecified site C84.11 Sézary disease, lymph nodes of head, face, and neck C84.12 Sézary disease, intrathoracic lymph nodes C84.13 Sézary disease, intra-abdominal lymph nodes C84.14 Sézary disease, lymph nodes of axilla and upper limb C84.15 Sézary disease, lymph nodes of inguinal region and lower limb C84.16 Sézary disease, intrapelvic lymph nodes
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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