At Meritage, Doctors are the ones making decisions about your healthcare. Meritage is a network of 1800 local physicians administering care for HMO patients in Marin, Sonoma, Napa, Solano, Fresno & Madera Counties. Meritage has contracts with most Commercial HMO plans and five Medicare Advantage plans (for a full list of contracted plans click here). All told, Meritage primary care physicians provide medical services to over nearly half a million residents of the North Bay Area and Central Valley.