Medical billing eligibility verification plays a vital role in identifying prior authorization requirements. Many insurance plans require approvals before specific procedures, tests, or treatments are performed. Eligibility verification helps confirm whether authorization is needed and ensures all payer guidelines are met in advance. Missing authorizations are a leading cause of claim denials and payment delays. By verifying eligibility and authorization requirements early, healthcare providers can avoid unnecessary rework and revenue loss. This proactive approach supports compliance, improves operational efficiency, and ensures smoother claim processing throughout the revenue cycle.