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C91.5

⚠ Non-billable (Header)

Adult T-cell lymphoma/leukemia (HTLV-1-associated)

Neoplasms (C00-D49)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

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)

❌ Excludes1

inherited from C91

Rules from parent category C91: Lymphoid leukemia

  • • personal history of leukemia (Z85.6)

Child Codes (3)

C91.50Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remissionC91.51Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remissionC91.52Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapse

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Code Information

CodeC91.5
BillableNo — Header code
ParentC91
CategoryNeoplasms (C00-D49)
Excludes11 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)