CPT code 83704 represents a laboratory assay that measures lipoprotein particle numbers and, when performed, particle subclasses in blood. This assay is clinically relevant because particle number can offer additional cardiovascular risk information beyond traditional lipid panels, influencing diagnostic evaluation and management pathways at a national level. The code is used for reporting specialized laboratory services performed in clinical or hospital laboratories.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what CPT code 83704 covers, typical sites of service, and the clinical context for ordering the test. The publication outlines reimbursement and billing benchmarks, common billing scenarios, allowable modifiers listed for this code, and payer coverage patterns where available. It also summarizes policy considerations and documentation points relevant to labs and billing professionals.

The article is intended to inform laboratory managers, billing staff, clinicians ordering advanced lipid testing, and policy analysts about the code’s clinical role, billing context, and payer landscape on a national scale. Data not available in the input is noted explicitly where applicable.