Is C91 a billable code?
No. C91 is a header code that groups 27 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
C91: Lymphoid leukemia
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
C91 groups related diagnoses under lymphoid leukemia. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under C91
- C91.00Acute lymphoblastic leukemia not having achieved remission
- C91.01Acute lymphoblastic leukemia, in remission
- C91.02Acute lymphoblastic leukemia, in relapse
- C91.10Chronic lymphocytic leukemia of B-cell type not having achieved remission
- C91.11Chronic lymphocytic leukemia of B-cell type in remission
- C91.12Chronic lymphocytic leukemia of B-cell type in relapse
- C91.30Prolymphocytic leukemia of B-cell type not having achieved remission
- C91.31Prolymphocytic leukemia of B-cell type, in remission
- C91.32Prolymphocytic leukemia of B-cell type, in relapse
- C91.40Hairy cell leukemia not having achieved remission
- C91.41Hairy cell leukemia, in remission
- C91.42Hairy cell leukemia, in relapse
- C91.50Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission
- C91.51Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remission
- C91.52Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapse
- C91.60Prolymphocytic leukemia of T-cell type not having achieved remission
- C91.61Prolymphocytic leukemia of T-cell type, in remission
- C91.62Prolymphocytic leukemia of T-cell type, in relapse
- C91.90Lymphoid leukemia, unspecified not having achieved remission
- C91.91Lymphoid leukemia, unspecified, in remission
- C91.92Lymphoid leukemia, unspecified, in relapse
- C91.A0Mature B-cell leukemia Burkitt-type not having achieved remission
- C91.A1Mature B-cell leukemia Burkitt-type, in remission
- C91.A2Mature B-cell leukemia Burkitt-type, in relapse
- C91.Z0Other lymphoid leukemia not having achieved remission
- C91.Z1Other lymphoid leukemia, in remission
- C91.Z2Other lymphoid leukemia, in relapse
C91 questions
What does C91 mean?
C91 is the ICD-10-CM code for Lymphoid leukemia. It is in chapter 2, Neoplasms (C00-D49).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.