Patient Engagement; Analytics; Interoperability; ... visit the My Greenway online support portal, or call 877-932-6301, press 2. Corporate headquarters. ... Billing: 877-932-6301, press 3 Fax: 770-836-3200. Greenway Carrollton. 100 Greenway Blvd. Carrollton, GA 30117. Greenway India # 02-104 WeWork Vaishnavi Signature No. 78/9, Outer Ring Road ....