2025 ICD-10-CM Diagnosis Code C84

by

Mature T/NK-cell lymphomas

  • C84 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2025 edition of ICD-10-CM C84 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of C84 – other international versions of ICD-10 C84 may differ.

Type 1 Excludes

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

The following code(s) above C84 contain annotation back-references

 that may be applicable to C84:

  • C00-D49  Neoplasms
  • C81-C96  Malignant neoplasms of lymphoid, hematopoietic and related tissue

Clinical Information

  • 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.
  • 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.

Code History

  • 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): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to C84:

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