ICD-10-CM category
C91 Lymphoid leukaemia
C91 is a category, not a billable code. Report one of the 27 complete codes below.
Codes in 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
Outside the US? C91 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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