Experience with payer portals for regional and national commercial payers, including Blue Cross Blue Shield plans, Aetna, Cigna, Optum/UnitedHealthcare, Medicare contractors, and Medicaid managed-care organizations. The ideal candidate has at least two years of hands-on insurance A/R follow-up and claim-resolution experience, including direct payer outreach, portal-based research, denial management, corrected claims, reconsiderations, appeals, and escalation of recurring payer or workflow issues.