C84.1 — Sezary disease
C84.1 is a non-billable header ICD-10-CM code for sezary disease. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1 inherited from the categories above C84.1
These are not written on C84.1, but they bind it: a note on a category applies to every code beneath it. Billing C84.1 with anything listed here is a denial.
Other codes that can never be billed with C84.1
These codes carry an Excludes1 note pointing at C84.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C84.1 alone.
Risk adjustment
C84.1 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
C84.1 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 C84.1
11 child codes. Green means billable.
- C84.10Sezary disease, unspecified site
- C84.11Sezary disease, lymph nodes of head, face, and neck
- C84.12Sezary disease, intrathoracic lymph nodes
- C84.13Sezary disease, intra-abdominal lymph nodes
- C84.14Sezary disease, lymph nodes of axilla and upper limb
- C84.15Sezary disease, lymph nodes of inguinal region and lower limb
- C84.16Sezary disease, intrapelvic lymph nodes
- C84.17Sezary disease, spleen
- C84.18Sezary disease, lymph nodes of multiple sites
- C84.19Sezary disease, extranodal and solid organ sites
- C84.1ASezary disease, in remission
Related codes at this level
Codes that share C84. If C84.1 is not quite right, the correct code is usually one of these.
- C84.0Mycosis fungoides
- C84.4Peripheral T-cell lymphoma, not elsewhere classified
- C84.6Anaplastic large cell lymphoma, ALK-positive
- C84.7Anaplastic large cell lymphoma, ALK-negative
- C84.ACutaneous T-cell lymphoma, unspecified
- C84.ZOther mature T/NK-cell lymphomas
- C84.9Mature T/NK-cell lymphomas, unspecified
Questions about C84.1
- Is C84.1 a billable ICD-10-CM code?
- No. C84.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C84.1 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 C84.1?
- C84.1 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 C84.1 (C84) and apply to it just the same.