ICD-10-CM
ICD-10 code for CLL: C91.10
The closest CDC title for "CLL" is C91.10, Chronic lymphocytic leukemia of B-cell type not having achieved remission. C91.10 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under C91, then other CDC titles that name chronic lymphocytic leukemia of b-cell type not having achieved remission
A header groups codes and is not billed. A billable code is one you can report.
- C91Lymphoid leukemiaHeader
- C91.0Acute lymphoblastic leukemia [ALL]Header
- C91.00Acute lymphoblastic leukemia not having achieved remissionBillable
- C91.01Acute lymphoblastic leukemia, in remissionBillable
- C91.02Acute lymphoblastic leukemia, in relapseBillable
- C91.1Chronic lymphocytic leukemia of B-cell typeHeader
- C91.10Chronic lymphocytic leukemia of B-cell type not having achieved remissionBillable
- C91.11Chronic lymphocytic leukemia of B-cell type in remissionBillable
- C91.12Chronic lymphocytic leukemia of B-cell type in relapseBillable
- C91.3Prolymphocytic leukemia of B-cell typeHeader
- C91.30Prolymphocytic leukemia of B-cell type not having achieved remissionBillable
- C91.31Prolymphocytic leukemia of B-cell type, in remissionBillable
- C91.32Prolymphocytic leukemia of B-cell type, in relapseBillable
- C91.4Hairy cell leukemiaHeader
- C91.40Hairy cell leukemia not having achieved remissionBillable
- C91.41Hairy cell leukemia, in remissionBillable
- C91.42Hairy cell leukemia, in relapseBillable
- C91.5Adult T-cell lymphoma/leukemia (HTLV-1-associated)Header
- C91.50Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remissionBillable
- C91.51Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remissionBillable
- C91.52Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapseBillable
- C91.6Prolymphocytic leukemia of T-cell typeHeader
- C91.60Prolymphocytic leukemia of T-cell type not having achieved remissionBillable
- C91.61Prolymphocytic leukemia of T-cell type, in remissionBillable
- C91.62Prolymphocytic leukemia of T-cell type, in relapseBillable
- C91.9Lymphoid leukemia, unspecifiedHeader
- C91.90Lymphoid leukemia, unspecified not having achieved remissionBillable
- C91.91Lymphoid leukemia, unspecified, in remissionBillable
- C91.92Lymphoid leukemia, unspecified, in relapseBillable
- C91.AMature B-cell leukemia Burkitt-typeHeader
- C91.A0Mature B-cell leukemia Burkitt-type not having achieved remissionBillable
- C91.A1Mature B-cell leukemia Burkitt-type, in remissionBillable
- C91.A2Mature B-cell leukemia Burkitt-type, in relapseBillable
- C91.ZOther lymphoid leukemiaHeader
- C91.Z0Other lymphoid leukemia not having achieved remissionBillable
- C91.Z1Other lymphoid leukemia, in remissionBillable
- C91.Z2Other lymphoid leukemia, in relapseBillable
Excludes1
Related conditions
Related pages
- C91.10 code detailsNotes, nearby codes, CMS-HCC group
- Category C91Every code under it
- Chapter 2Neoplasms
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for CLL?
The closest CDC title for "CLL" is C91.10, Chronic lymphocytic leukemia of B-cell type not having achieved remission. C91.10 is a billable code.
Is C91.10 billable?
Yes. C91.10 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to C91.10?
The CDC tabular list gives 2 Excludes1 notes (not coded together) for C91.10 and the categories above it. They are listed on this page.
What chapter is C91.10 in?
Chapter 2. Neoplasms.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.