• Execute monthly billing processes, including enrollment and disenrollment updates, data validation, and invoice preparation. • Review and reconcile client census counts and supporting billing inputs to ensure completeness and accuracy. • Generate and distribute invoices in accordance with contractual terms and internal controls. • Review vendor-related charges (e.g., courier invoices) and ensure appropriate client billing allocation. • Support resolution of pharmacy billing issues, including rebills, claim rejections, and insurance discrepancies. • Partner with operational teams and network pharmacies to investigate and resolve PBM and billing issues. • Process and document billing adjustments, including medication return credits. • Prepare billing schedules and documentation to support internal reviews and external audits. • Assist with onboarding new clients or transitions of services to ensure billing continuity. • Assist with audits, including annual PACE audits, quarterly PBM audits, and other internal or external reviews.