C91.4
Non-billableHairy 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.
C00-D49 Neoplasms
What this means — in plain language
MedlinePlus · NIHWhat is leukemia? Leukemia is a term for cancers of the blood cells. Leukemia starts in blood-forming tissues such as the bone marrow. Your bone marrow makes the cells which will develop into white blood cells, red blood cells, and platelets. Each type of cell has a different job: White blood cells help your body fight infection Red blood cells deliver oxygen from your lungs to your tissues and organs Platelets help…
Read more about Leukemia at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •Leukemic reticuloendotheliosis
Medications indicated for this condition
FDA labeling- Bendamustine›
- Doxorubicin›
- Imatinib›
- MethotrexateFolate Analog Metabolic Inhibitor [EPC]›
- Dasatinib›
- CyclophosphamideAlkylating Drug [EPC]›
- CytarabineNucleoside Metabolic Inhibitor [EPC]›
- Mercaptopurine›
- NelarabineNucleoside Metabolic Inhibitor [EPC]›
- ClofarabineNucleoside Metabolic Inhibitor [EPC]›
- Fludarabine›
- RituximabCD20-directed Cytolytic Antibody [EPC]›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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