Summary & Overview
CPT 82759: Galactokinase Enzyme Assay in Red Blood Cells
CPT code 82759 represents a laboratory enzymatic assay that measures galactokinase activity in red blood cells. This test detects galactokinase deficiency, a metabolic abnormality that can cause accumulation of galactitol and contribute to early-onset cataracts and other complications. As a targeted diagnostic assay, CPT code 82759 is clinically important for confirming suspected inherited disorders of galactose metabolism and guiding further genetic and metabolic evaluation.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and typical sites of service, along with payer coverage considerations and common billing modifiers where applicable. The publication outlines benchmarks and coding relationships relevant to laboratory service lines and summarizes the role of this assay in diagnostic workflows. It also flags areas where data are not available in the input, such as specific associated taxonomies, ICD-10 diagnoses, and related codes, so users know where further local payer policy review is needed.
Billing Code Overview
CPT code 82759 measures galactokinase activity in red blood cells, an enzyme assay that evaluates the body's ability to metabolize the simple sugar galactose. The test identifies absence or deficiency of galactokinase, a condition that can lead to abnormal buildup of galactitol and is associated with cataract formation and other metabolic complications.
Service type: Clinical laboratory enzymatic assay
Typical site of service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A newborn or infant with suspected galactosemia is referred for enzymatic testing of red blood cell galactokinase activity. Typical presentation includes poor feeding, jaundice, hepatomegaly, failure to thrive, vomiting, or cataract formation noted on ophthalmologic exam. A pediatrician, neonatologist, or metabolic specialist orders the test after abnormal newborn metabolic screening (elevated galactose or reducing substances) or when a family history of galactosemia exists. Blood is collected in an EDTA tube and sent to a clinical chemistry or biochemical genetics laboratory. The lab analyst performs the 82759 assay to measure galactokinase activity in erythrocytes; results guide diagnosis of galactokinase deficiency and inform immediate dietary management and genetic counseling. Typical sites of service are hospital inpatient laboratories, outpatient reference clinical laboratories, and specialty biochemical genetics laboratories.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional component for interpretation if applicable (rare for enzymatic assays but used if separate professional reporting occurs). |
TC |