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C91.5

Non-billable

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

C91.5 is the ICD-10-CM code for Adult T-cell lymphoma/leukemia (HTLV-1-associated). It is a non-billable category code — use a more specific child code such as C91.50 for billing.

Status
Header (non-billable)
Chapter
C00-D49
Parent
C91
Subcodes
3
Edition
FY2026

C00-D49 Neoplasms

Includes

  • •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)

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)". It falls under C00-D49 Neoplasms.
Is C91.5 a billable code?
No — C91.5 is a non-billable header code. Use a more specific child code (such as C91.50) for billing.
What are the subcodes of C91.5?
C91.5 has 3 more specific child codes, including C91.50, C91.51, C91.52.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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