CPT code 73722 denotes an MRI of a lower extremity joint performed with contrast. As a commonly used diagnostic imaging code, it facilitates evaluation of joint pathology such as labral tears, cartilage defects, synovial disease, and occult soft-tissue injury. Accurate coding for contrast-enhanced joint MRI affects clinical documentation, imaging workflows, and claims processing across national payers.

This analysis covers coverage and billing practices for major national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical indications and typical sites of service, comparisons of payer coverage tendencies, and common billing considerations including service line placement and frequently used modifiers. The publication also summarizes benchmark metrics used by payers and highlights policy updates that influence prior authorization and medical necessity review for contrast-enhanced lower extremity joint MRI.

Intended for billing professionals, radiology administrators, and healthcare policy analysts, the brief provides the clinical context needed to align documentation with payer requirements and to understand where administrative barriers commonly occur. Data not available in the input is noted where applicable, and detailed payer-specific policy text is summarized rather than reproduced verbatim.