C91.1
Non-billableChronic lymphocytic leukemia of B-cell type
C91.1 is the ICD-10-CM code for Chronic lymphocytic leukemia of B-cell type. It is a non-billable category code — use a more specific child code such as C91.10 for billing.
C00-D49 Neoplasms
Includes
- •Lymphoplasmacytic leukemia
- •Richter syndrome
Excludes1 — not coded here
- •lymphoplasmacytic lymphoma (C83.0-)
Frequently asked questions
- What is ICD-10 code C91.1?
- C91.1 is the ICD-10-CM code for "Chronic lymphocytic leukemia of B-cell type". It falls under C00-D49 Neoplasms.
- Is C91.1 a billable code?
- No — C91.1 is a non-billable header code. Use a more specific child code (such as C91.10) for billing.
- What are the subcodes of C91.1?
- C91.1 has 3 more specific child codes, including C91.10, C91.11, C91.12.
- What is excluded from C91.1?
- Excludes1 (not coded here): lymphoplasmacytic lymphoma (C83.0-).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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