The Contracting and Credentialing Specialist is responsible for managing the full lifecycle of payer contracting and provider credentialing for a nationwide portfolio of clinics and provider groups across all levels of care in behavioral health and substance use disorder (SUD) treatment. This role ensures that providers, facilities, and locations are properly enrolled, credentialed, and contracted with commercial and government payers (including state Medicaid programs, MCOs, and managed behavioral health organizations) so that claims can be billed and paid without disruption. The specialist works closely with billing, VOB (verification of benefits), and utilization review teams to resolve credentialing-related claim rejections and to keep provider data accurate and audit-ready across all client accounts.