CPT code 86805 represents a donor lymphocyte–recipient serum crossmatch assay used to detect antibody‑mediated incompatibility prior to organ or tissue transplant. This laboratory procedure is clinically important because it helps identify immunologic risk that can affect transplant selection, perioperative planning, and post‑transplant immunosuppression strategies. Nationally, compatibility testing is a routine step in transplantation workflows and has implications for laboratory capacity, coding accuracy, and payer coverage.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose and service settings for 86805, plus national benchmarking considerations for billing and reimbursement, common modifiers encountered in claims processing, and the clinical context in which the test is ordered. The publication also outlines typical sites of service and operational implications for hospital and reference laboratories.

The report is intended to inform coding professionals, laboratory administrators, and transplant program stakeholders about the role of CPT code 86805 in practice, expected billing scenarios, and areas where policy updates or payer guidance commonly affect coverage and claim adjudication.