C91 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Lymphoid leukemia.
Type 1 excludes
Personal history of leukemia (Z85.6)
Codes
C91.0
Acute lymphoblastic leukemia [ALL]
C91.1
Chronic lymphocytic leukemia of B-cell type
C91.3
Prolymphocytic leukemia of B-cell type
C91.4
Hairy cell leukemia
C91.5
Adult T-cell lymphoma/leukemia (HTLV-1-associated)
C91.6
Prolymphocytic leukemia of T-cell type
C91.A
Mature B-cell leukemia Burkitt-type
C91.Z
Other lymphoid leukemia
C91.9
Lymphoid leukemia, unspecified
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code