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

Cite This Page

Reference C84 with the canonical source and edition:

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

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

Related Codes

More Specific Codes

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 C84.Z Other mature T/NK-cell lymphomas

All Codes in C84

Every most-specific code under C84 Mature T/NK-cell lymphomas (89 codes):

Show the complete C84 code list
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 C84.10 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 C84.40 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 C84.45 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb C84.46 Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes C84.47 Peripheral T-cell lymphoma, not elsewhere classified, spleen C84.48 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of multiple sites C84.49 Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites C84.4A Peripheral T-cell lymphoma, not elsewhere classified, in remission C84.60 Anaplastic large cell lymphoma, ALK-positive, unspecified site C84.61 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of head, face, and neck C84.62 Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodes C84.63 Anaplastic large cell lymphoma, ALK-positive, intra-abdominal lymph nodes C84.64 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb C84.65 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb C84.66 Anaplastic large cell lymphoma, ALK-positive, intrapelvic lymph nodes C84.67 Anaplastic large cell lymphoma, ALK-positive, spleen C84.68 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of multiple sites C84.69 Anaplastic large cell lymphoma, ALK-positive, extranodal and solid organ sites C84.6A Anaplastic large cell lymphoma, ALK-positive, in remission C84.70 Anaplastic large cell lymphoma, ALK-negative, unspecified site C84.71 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of head, face, and neck C84.72 Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodes C84.73 Anaplastic large cell lymphoma, ALK-negative, intra-abdominal lymph nodes C84.74 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of axilla and upper limb C84.75 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of inguinal region and lower limb C84.76 Anaplastic large cell lymphoma, ALK-negative, intrapelvic lymph nodes C84.77 Anaplastic large cell lymphoma, ALK-negative, spleen C84.78 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of multiple sites C84.79 Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites C84.7A Anaplastic large cell lymphoma, ALK-negative, breast C84.7B Anaplastic large cell lymphoma, ALK-negative, in remission C84.90 Mature T/NK-cell lymphomas, unspecified, unspecified site C84.91 Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck C84.92 Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes C84.93 Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes C84.94 Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb C84.95 Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb C84.96 Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes C84.97 Mature T/NK-cell lymphomas, unspecified, spleen C84.98 Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sites C84.99 Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites C84.9A Mature T/NK-cell lymphomas, unspecified, in remission C84.A0 Cutaneous T-cell lymphoma, unspecified, unspecified site C84.A1 Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck C84.A2 Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes C84.A3 Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes C84.A4 Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limb C84.A5 Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb C84.A6 Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodes C84.A7 Cutaneous T-cell lymphoma, unspecified, spleen C84.A8 Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sites C84.A9 Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sites C84.AA Cutaneous T-cell lymphoma, unspecified, in remission 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
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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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