You can use this document to figure out who your Medicare Administrative Assistant Coordinator (MAC) is for your state. https://www.cms.gov/Medicare/Medicare-Contracting/Medicare-Administrative-Contractors/Downloads/MACs-by-State-June-2019.pdf
What’s the difference between a referral and a reseller agreement?
To understand the difference between a referral and a reseller agreement, please refer to this PDF: https://www.medbillinguniversity.com/wp-content/uploads/2022/06/Referral-VS-Reseller.pdf