C91.4

Non-billable

Hairy cell leukemia

C91.4 is the ICD-10-CM code for Hairy cell leukemia. It is a non-billable category code — use a more specific child code such as C91.40 for billing.

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

C00-D49 Neoplasms

Includes

  • Leukemic reticuloendotheliosis

Frequently asked questions

What is ICD-10 code C91.4?
C91.4 is the ICD-10-CM code for "Hairy cell leukemia". It falls under C00-D49 Neoplasms.
Is C91.4 a billable code?
No — C91.4 is a non-billable header code. Use a more specific child code (such as C91.40) for billing.
What are the subcodes of C91.4?
C91.4 has 3 more specific child codes, including C91.40, C91.41, C91.42.

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

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