HCPCS Level II code P2029 designates the laboratory procedure “Congo red, blood,” a diagnostic stain used primarily to detect amyloid or related protein deposits in blood specimens. As a specific HCPCS Level II pathology/laboratory code, it matters nationally for coding consistency, claims processing, and coverage decisions involving specialized laboratory testing. Payers rely on accurate HCPCS Level II coding to determine coverage, prior authorization needs, and reimbursement levels for uncommon or specialty assays.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of code usage, payer coverage considerations, and the clinical context in which this test is ordered. The publication outlines typical billing scenarios, common modifiers associated with laboratory services, and where the test is usually performed.

This summary provides clinicians, billing staff, and policy analysts with benchmarks for administrative handling of P2029, notes on clinical indications tied to Congo red staining in hematology, and a reference for expected sites of service. Data not available in the input is explicitly noted elsewhere.