Since 1992 Gateway Health has operated as a managed care organization serving Pennsylvanians that are eligible for Medical Assistance. Gateway Health is affiliated with Highmark Blue Cross Blue Shield and Mercy Health System.

In 2006 Gateway Health launched an HMO SNP plan focused on beneficiaries who are eligible for both Medicare and Medicaid. Growth continued in 2013 when three (3) new Medicare Advantage Special Needs plans were introduced: Partial dual plan and 2 CSNP plans.

In 2014 Gateway Health expanded into Ohio and added two (2) MAPD plans. The following year Gateway Health continued to expand operations in new counties in PA, OH, KY and NC; total service area is 209 counties and growing.