Hairy Cell Leukemia

HCL

clinical

Updated 5/16/2026

Definition

A rare, slow-growing blood cancer classified under ICD-10 code C91.4, abbreviated as HCL in oncology EHR systems and claims data. Used in diagnosis classification, oncology registry data, prior authorization workflows, and specialty pharmacy benefit management for targeted therapies.

Standard Abbreviation

HCL

Database Usage

-- Example column naming
CREATE TABLE claims (
  clm_id VARCHAR(50),
  hcl VARCHAR(100),  -- Hairy Cell Leukemia (max 100 chars)
  ...
);

-- Example in SELECT
SELECT
  clm_id,
  hcl as hairy_cell_leukemia
FROM claims;

Common uses in healthcare data

Risk stratification and population health analytics
CMS-HCC risk adjustment and RAF score calculation
Quality measure attribution and HEDIS reporting
Clinical data warehouse schema design
Value-based care contract performance tracking

Example database column name

ISO-11179 snake_case standard

-- Recommended column name
hcl

-- Example DDL
CREATE TABLE healthcare_data (
  record_id   VARCHAR(50)   NOT NULL,
  hcl          VARCHAR(100),  -- Hairy Cell Leukemia (max 100 chars)
  created_dt  TIMESTAMP     NOT NULL DEFAULT NOW()
);

Column names follow the ISO-11179 naming convention: lowercase, underscore-separated, using the standard abbreviation as a prefix where applicable.

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