Is C91.1 a billable code?
No. C91.1 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
C91.1: Chronic lymphocytic leukemia of B-cell type
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
C91.1 groups related diagnoses under chronic lymphocytic leukemia of b-cell type. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under C91.1
- 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
Other codes in C91 Lymphoid leukemia
- C91.0Acute lymphoblastic leukemia [ALL]header
- C91.3Prolymphocytic leukemia of B-cell typeheader
- C91.4Hairy cell leukemiaheader
- C91.5Adult T-cell lymphoma/leukemia (HTLV-1-associated)header
- C91.6Prolymphocytic leukemia of T-cell typeheader
- C91.9Lymphoid leukemia, unspecifiedheader
- C91.AMature B-cell leukemia Burkitt-typeheader
- C91.ZOther lymphoid leukemiaheader
C91.1 questions
What does C91.1 mean?
C91.1 is the ICD-10-CM code for Chronic lymphocytic leukemia of B-cell type. It is in chapter 2, Neoplasms (C00-D49).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.