Hairy Cell Leukemia

Hairy Cell Leukemia is indexed under Oncologic-Adjacent Chronic, Lymphoproliferative. Also known as HCL.

US prevalence

~1,000 new/year; prevalence ~20,000-30,000 Source: SEER; LLS. Cites federal and non-federal sources, and the record does not say which one gave this figure. Label: REPORTED.

ICD-10-CM codes

C91.4

Typical onset

Median age ~55

Course

managed

Body systems

hematologic

Sex differences

M:F ~4:1

Racial and ethnic differences

More common in Ashkenazi Jewish descent

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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