C91
⚠ Non-billable (Header)Lymphoid leukemia
Neoplasms (C00-D49)
⚠️ This is a category header code — not billable. Use a more specific child code below.
❌ Excludes1
directCannot be coded with C91
- • personal history of leukemia (Z85.6)
Child Codes (9)
C91.0Acute lymphoblastic leukemia [ALL]C91.1Chronic lymphocytic leukemia of B-cell typeC91.3Prolymphocytic leukemia of B-cell typeC91.4Hairy cell leukemiaC91.5Adult T-cell lymphoma/leukemia (HTLV-1-associated)C91.6Prolymphocytic leukemia of T-cell typeC91.9Lymphoid leukemia, unspecifiedC91.AMature B-cell leukemia Burkitt-typeC91.ZOther lymphoid leukemia
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CodeC91
BillableNo — Header code
CategoryNeoplasms (C00-D49)
Excludes11 rule(s)
Excludes20 note(s)
Child codes9
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)