C91.5 – Adult T-cell lymphoma/leukemia (HTLV-1-associated)
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Code
C91.5(claims format:C915)- Description
- Adult T-cell lymphoma/leukemia (HTLV-1-associated)
- 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 C91.5
C91.5 is a header code and cannot be used on claims. Choose the most specific code:
Notes for C91.5
- Acute variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
- Chronic variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
- Lymphomatoid variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
- Smouldering variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C91 – Lymphoid leukemia
- personal history of leukemia (Z85.6)
Block C81-C96
Index terms for C91.5
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C91
- C91.0 – Acute lymphoblastic leukemia [ALL]Header
- C91.1 – Chronic lymphocytic leukemia of B-cell typeHeader
- C91.3 – Prolymphocytic leukemia of B-cell typeHeader
- C91.4 – Hairy cell leukemiaHeader
- C91.6 – Prolymphocytic leukemia of T-cell typeHeader
- C91.A – Mature B-cell leukemia Burkitt-typeHeader
- C91.Z – Other lymphoid leukemiaHeader
- C91.9 – Lymphoid leukemia, unspecifiedHeader
Frequently asked questions
What is ICD-10 code C91.5?
C91.5 is the ICD-10-CM code for adult T-cell lymphoma/leukemia (HTLV-1-associated), in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).
Is C91.5 a billable code?
No. C91.5 is a header code with more specific child codes; report one of the billable codes listed above.
What category does C91.5 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.