Summary & Overview
CPT 84704: Free Beta hCG Quantitation for First-Trimester Screening
CPT code 84704 denotes laboratory quantitation of the free beta subunit of human chorionic gonadotropin (free beta hCG), a first-trimester biomarker used in prenatal screening for chromosomal abnormalities such as Down syndrome. Nationally, this test is a component of prenatal aneuploidy risk assessment and influences diagnostic follow-up, counseling, and care pathways for pregnant patients. Coverage and utilization of this test affect screening programs, prenatal clinical workflows, and laboratory operations across payers.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication reviews typical coverage considerations, common billing modifiers, and where CPT code 84704 fits in prenatal screening panels.
Readers will find concise benchmarks for clinical context and billing practice, an explanation of the test’s role in first-trimester screening, and a summary of payer considerations and common operational implications for laboratories and clinicians. Data not available in the input for payer-specific rates, ICD-10 pairings, and associated taxonomies is noted where applicable.
Billing Code Overview
CPT code 84704 describes a laboratory test that quantifies the free beta subunit of human chorionic gonadotropin (free beta hCG), typically performed on serum or whole blood. The assay measures the concentration of free beta hCG, a biomarker used in prenatal screening to help detect fetal chromosomal abnormalities, including trisomy 21 (Down syndrome), most commonly during the first trimester.
Service Type: Laboratory diagnostic testing
Typical Site of Service: Clinical laboratory or hospital laboratory, with specimen collection in ambulatory or outpatient phlebotomy settings
Clinical & Coding Specifications
Clinical Context
A 32-year-old pregnant patient at 10 weeks' gestation presents to an obstetrics clinic for first-trimester aneuploidy screening. The clinician orders a serum screening panel that includes measurement of free beta human chorionic gonadotropin (84704) to assess risk for fetal chromosomal abnormalities such as trisomy 21 (Down syndrome). A phlebotomy technician collects a maternal blood sample; the specimen is sent to a clinical laboratory where a laboratory analyst performs the technical assay for quantitation of free beta hCG. Results are reported to the ordering obstetric provider and incorporated into first-trimester risk calculations alongside nuchal translucency ultrasound and other serum markers. Typical site of service is an outpatient laboratory or hospital laboratory performing routine prenatal screening; specimen collection often occurs in an ambulatory clinic, obstetrics office, or outpatient lab draw station.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting the physician professional interpretation component if separate from the technical lab component |
TC |