CPT code 84163 designates a quantitative assay for pregnancy-associated plasma protein A (PAPP-A), a first-trimester biochemical marker used in prenatal screening for chromosomal aneuploidies such as Down syndrome (trisomy 21) and for assessing certain pregnancy complications. Nationally, this laboratory test is an important component of early prenatal risk assessment and is commonly ordered alongside other first-trimester screening elements.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for CPT code 84163, typical sites of service, and common billing considerations. The publication summarizes payer coverage patterns, standard modifiers observed in practice, and how CPT code 84163 fits into prenatal screening workflows.

This resource provides benchmarks and policy-relevant context for administrators, laboratory managers, and clinicians involved in prenatal screening programs. It highlights what to expect when coding and billing for a PAPP-A quantitation and outlines where to look for payer-specific coverage rules and reimbursement policies. Data not available in the input where specific payer policies, taxonomies, or ICD-10 pairings would normally be listed.