ICD-10-CM · Chapter 2

C91..1 Chronic lymphocytic leukemia of B-cell type

Non-billable header

← C91 — Lymphoid leukemia Chapter 2: C00-D49

Includes

Lymphoplasmacytic leukemia
Richter syndrome

Excludes 1 (cannot be coded together)

lymphoplasmacytic lymphoma (C83.0-)

Last reviewed: September 2026