ICD-10-CM C84: Mature T/NK-cell lymphomas

ICD-10-CM Diagnosis Code (2025)

Official Description for C84

Mature T/NK-cell lymphomas

Coding Notes & Guidelines for C84

Excludes1: Not Coded Here

personal history of non-Hodgkin lymphoma (Z85.72)

Excludes1: Not Coded Here

peripheral T-cell lymphoma, not elsewhere classified (C84.4-)

Excludes1: Not Coded Here

primary cutaneous CD30-positive T-cell proliferations (C86.6-)

Excludes1: Not Coded Here
  • 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-)
Excludes1: Not Coded Here

mature T-cell lymphoma, not elsewhere classified (C84.4-)

Use Additional Code
  • code to identify:
  • breast implant status (Z98.82)
  • personal history of breast implant removal (Z98.86)
Inclusion Terms
  • Lennert's lymphoma
  • Lymphoepithelioid lymphoma
  • Mature T-cell lymphoma, not elsewhere classified
Inclusion Terms

Anaplastic large cell lymphoma, CD30-positive

Inclusion Terms

Breast implant associated anaplastic large cell lymphoma (BIA-ALCL)

Inclusion Terms

NK/T cell lymphoma NOS

Child Codes (More Specific Codes for 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 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 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 C84.6 - Anaplastic large cell lymphoma, ALK-positive 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 C84.7 - Anaplastic large cell lymphoma, ALK-negative 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 C84.9 - Mature T/NK-cell lymphomas, unspecified 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.A - Cutaneous T-cell lymphoma, unspecified 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.Z - Other mature T/NK-cell lymphomas 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

About ICD-10-CM Code C84 (Mature T/NK-cell lymphomas)

ICD-10-CM code C84 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C84 became effective on October 1, 2024.

This page provides detailed information about C84 - Mature T/NK-cell lymphomas. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Mature T/NK-cell lymphomas.