C84.9
ICD-10Non-billable categoryMature T/NK-cell lymphomas, unspecified
Official ICD-10-CM descriptor (FY2026)
Mature T/NK-cell lymphomas, unspecified
C84.9 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Inclusion terms
- NK/T cell lymphoma NOS
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- mature T-cell lymphoma, not elsewhere classified (C84.4-)
ICD-10-CM FY2026 defines 11 codes beneath C84.9. See the ICD-10-CM index for what this site publishes.
Related codes in C84
- C84.0Mycosis fungoidescategory
- C84.1Sezary diseasecategory
- C84.4Peripheral T-cell lymphoma, not elsewhere classifiedcategory
- C84.6Anaplastic large cell lymphoma, ALK-positivecategory
- C84.7Anaplastic large cell lymphoma, ALK-negativecategory
- C84.ACutaneous T-cell lymphoma, unspecifiedcategory
- C84.ZOther mature T/NK-cell lymphomascategory
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
- Parent code
- C84
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.