1. ICD-10-CM Codes
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2. C00-D49
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3. C81-C96
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4. C84-
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5. 2023 ICD-10-CM Diagnosis Code C84.4

2023 ICD-10-CM Diagnosis Code C84.4

Peripheral T-cell lymphoma, not elsewhere classified

2016 2017 2018 2019 2020 2021 2022 2023 - Revised Code Non-Billable/Non-Specific Code

• C84.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• ICD-10-CM C84.4 is a revised 2023 ICD-10-CM code that became effective on October 1, 2022.
• This is the American ICD-10-CM version of C84.4 - other international versions of ICD-10 C84.4 may differ.

• A group of malignant lymphomas thought to derive from peripheral t-lymphocytes in lymph nodes and other nonlymphoid sites. They include a broad spectrum of lymphocyte morphology, but in all instances express t-cell markers admixed with epithelioid histiocytes, plasma cells, and eosinophils. Although markedly similar to large-cell immunoblastic lymphoma (lymphoma, large-cell, immunoblastic), this group's unique features warrant separate treatment.
• A variant of peripheral t-cell lymphoma, not otherwise specified. It is characterized by the presence of neoplastic small lymphocytes infiltrating the lymph nodes in a diffuse and less frequently interfollicular pattern. There is an associated proliferation of epithelioid histiocytes forming confluent clusters.
• Aggressive nodal or extranodal mature (peripheral) t-cell lymphomas that do not belong to the better defined entities of the remainder of mature t-cell lymphomas. This category includes the following variants: lymphoepithelioid cell variant (lennert's lymphoma), follicular variant, and t-zone variant.
• One of a group of aggressive (fast-growing) non-hodgkin lymphomas that begin in mature t lymphocytes (t cells that have matured in the thymus gland and gone to other lymphatic sites in the body, including lymph nodes, bone marrow, and spleen.)
• One of a group of aggressive (fast-growing) non-hodgkin lymphomas that begins in mature t lymphocytes (t cells that have matured in the thymus gland and goes to other lymphatic sites in the body, including lymph nodes, bone marrow, and spleen.)
• This type of lymphoma is not frequently seen in the western hemisphere. Clinically, with the exception of anaplastic large cell lymphoma, mature t- and nk-cell lymphomas are among the most aggressive of all hematopoietic neoplasms. Representative disease entities include mycosis fungoides, angioimmunoblastic t-cell lymphoma, hepatosplenic t-cell lymphoma, and anaplastic large cell lymphoma.

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): Revised code
  • New description: Peripheral T-cell lymphoma, not elsewhere classified
  • 2022 description: Peripheral T-cell lymphoma, not classified

• Type 1 Excludes: C84.0
  , C84.9
  ICD-10-CM Diagnosis Code C84.0

  Mycosis fungoides

  2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

  Type 1 Excludes

  • peripheral T-cell lymphoma, not elsewhere classified (C84.4-)
  ICD-10-CM Diagnosis Code C84.9

  Mature T/NK-cell lymphomas, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

  Applicable To

  • NK/T cell lymphoma NOS

  Type 1 Excludes

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

• Lymphoma (of) (malignant) C85.90
  ICD-10-CM Diagnosis Code C85.90

  Non-Hodgkin lymphoma, unspecified, unspecified site

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • Lennert's C84.4-
  • lymphoepithelioid C84.4-
  • mature T-cell NEC C84.4-
  • peripheral T-cell NEC C84.4-

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.