C91.3 – Prolymphocytic leukemia of B-cell type

ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue

Non-billable header

ICD-10-CM code C91.3

Code: C91.3 (claims format: C913)
Description: Prolymphocytic leukemia of B-cell type
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 2. Neoplasms (C00-D49)
Block: C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue
Parent codes: C91

Billable codes under C91.3

C91.3 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

C91 – Lymphoid leukemia

Excludes1 (not coded here):

personal history of leukemia (Z85.6)

Block C81-C96

Excludes2 (not included here):

Kaposi's sarcoma of lymph nodes (C46.3)
secondary and unspecified neoplasm of lymph nodes (C77.-)
secondary neoplasm of bone marrow (C79.52)
secondary neoplasm of spleen (C78.89)

Index terms for C91.3

Entries in the ICD-10-CM alphabetic index that lead to this code:

Leukemia, leukemic, prolymphocytic, of B-cell type

Related codes in C91

Frequently asked questions

What is ICD-10 code C91.3?

C91.3 is the ICD-10-CM code for prolymphocytic leukemia of B-cell type, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).

Is C91.3 a billable code?

No. C91.3 is a header code with more specific child codes; report one of the billable codes listed above.

What category does C91.3 belong to?

It belongs to category C91 – Lymphoid leukemia.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.