C91.50 – Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission

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

Billable code

ICD-10-CM code C91.50
Code
C91.50 (claims format: C9150)
Description
Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission
Short description
Adult T-cell lymph/leuk (HTLV-1-assoc) not achieve remission
Billable
Yes – valid for HIPAA-covered transactions
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 › C91.5

Notes for C91.50

Applicable to:
  • Adult T-cell lymphoma/leukemia (HTLV-1-associated) with failed remission
  • Adult T-cell lymphoma/leukemia (HTLV-1-associated) NOS

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)

C91.5 – Adult T-cell lymphoma/leukemia (HTLV-1-associated)

Applicable to:
  • 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)

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)

Related codes in C91.5

Frequently asked questions

What is ICD-10 code C91.50?

C91.50 is the ICD-10-CM code for adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).

Is C91.50 a billable code?

Yes. C91.50 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does C91.50 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.