C85.1 — Unspecified B-cell lymphoma
C85.1 is a non-billable header ICD-10-CM code for unspecified b-cell lymphoma. It cannot be billed on its own: choose one of the more specific child codes below.
Notes
Additional guidance from the ICD-10-CM tabular list.
- If B-cell lineage or involvement is mentioned in conjunction with a specific lymphoma, code to the more specific description.
Excludes1 inherited from the categories above C85.1
These are not written on C85.1, but they bind it: a note on a category applies to every code beneath it. Billing C85.1 with anything listed here is a denial.
Other codes that can never be billed with C85.1
These codes carry an Excludes1 note pointing at C85.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C85.1 alone.
- C88Malignant immunoproliferative diseases and certain other B-cell lymphomas
Risk adjustment
C85.1 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
C85.1 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 C85.1
11 child codes. Green means billable.
- C85.10Unspecified B-cell lymphoma, unspecified site
- C85.11Unspecified B-cell lymphoma, lymph nodes of head, face, and neck
- C85.12Unspecified B-cell lymphoma, intrathoracic lymph nodes
- C85.13Unspecified B-cell lymphoma, intra-abdominal lymph nodes
- C85.14Unspecified B-cell lymphoma, lymph nodes of axilla and upper limb
- C85.15Unspecified B-cell lymphoma, lymph nodes of inguinal region and lower limb
- C85.16Unspecified B-cell lymphoma, intrapelvic lymph nodes
- C85.17Unspecified B-cell lymphoma, spleen
- C85.18Unspecified B-cell lymphoma, lymph nodes of multiple sites
- C85.19Unspecified B-cell lymphoma, extranodal and solid organ sites
- C85.1AUnspecified B-cell lymphoma, in remission
Related codes at this level
Codes that share C85. If C85.1 is not quite right, the correct code is usually one of these.
Questions about C85.1
- Is C85.1 a billable ICD-10-CM code?
- No. C85.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C85.1 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 C85.1?
- C85.1 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 C85.1 (C85) and apply to it just the same.