C84.Z — Other mature T/NK-cell lymphomas
C84.Z is a non-billable header ICD-10-CM code for other mature t/nk-cell lymphomas. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- 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-)
Notes
Additional guidance from the ICD-10-CM tabular list.
- If T-cell lineage or involvement is mentioned in conjunction with a specific lymphoma, code to the more specific description.
Excludes1 inherited from the categories above C84.Z
These are not written on C84.Z, but they bind it: a note on a category applies to every code beneath it. Billing C84.Z with anything listed here is a denial.
Other codes that can never be billed with C84.Z
These codes carry an Excludes1 note pointing at C84.Z. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C84.Z alone.
Risk adjustment
C84.Z does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code history
C84.Z has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead C84.Z
11 child codes. Green means billable.
- C84.Z0Other mature T/NK-cell lymphomas, unspecified site
- C84.Z1Other mature T/NK-cell lymphomas, lymph nodes of head, face, and neck
- C84.Z2Other mature T/NK-cell lymphomas, intrathoracic lymph nodes
- C84.Z3Other mature T/NK-cell lymphomas, intra-abdominal lymph nodes
- C84.Z4Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb
- C84.Z5Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb
- C84.Z6Other mature T/NK-cell lymphomas, intrapelvic lymph nodes
- C84.Z7Other mature T/NK-cell lymphomas, spleen
- C84.Z8Other mature T/NK-cell lymphomas, lymph nodes of multiple sites
- C84.Z9Other mature T/NK-cell lymphomas, extranodal and solid organ sites
- C84.ZAOther mature T/NK-cell lymphomas, in remission
Related codes at this level
Codes that share C84. If C84.Z is not quite right, the correct code is usually one of these.
Questions about C84.Z
- Is C84.Z a billable ICD-10-CM code?
- No. C84.Z is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C84.Z sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).
- What cannot be coded together with C84.Z?
- C84.Z carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above C84.Z (C84) and apply to it just the same.