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ICD-10 diagnosis code

C84.9 Mature T/NK-cell lymphoma, unspecified

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C84.9 is the ICD-10 code for Mature T/NK-cell lymphoma, unspecified. It is a four-character subcategory of C84 (Mature T/NK-cell lymphomas), the most specific level in the WHO edition. It belongs to the block C81–C96 (Malignant neoplasms, stated or presumed to be primary, of lymphoid, haematopoietic and related tissue) in Chapter II, Neoplasms.

Code type
Subcategory (4 characters)
Chapter
II · C00–D48
Classification
WHO ICD-10, 2019 version

What C84.9 includes

Conditions and terms that are coded here.

  • NK/T cell lymphoma NOS

What C84.9 excludes

Conditions that look similar but belong under another code.

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

C84.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

C84.9Moget T/NK-cellslymfom, ospecificerat

NorwayICD-10-NO

C84.9Uspesifisert modent T/NK-cellelymfom

DenmarkICD-10-DK

DC849Modent NK/T-celle lymfom UNS

GermanyICD-10-GM

C84.9Reifzelliges T/NK-Zell-Lymphom, nicht näher bezeichnet

FranceICD-10-FR

C84.9Lymphome à cellules T/NK matures, sans précision

NetherlandsICD-10-NL

C84.9lymfoom met rijpe T/NK-cellen, niet-gespecificeerd

United StatesICD-10-CM

Listed through more specific codes:

  • C84.90Mature T/NK-cell lymphomas, unspecified, unspecified site
  • C84.91Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
  • C84.92Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
  • C84.93Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
  • C84.94Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb
  • C84.95Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb
  • C84.96Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
  • C84.97Mature T/NK-cell lymphomas, unspecified, spleen
  • and 3 more national subcodes

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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