9. Service area
A Service area is a geographic area that for local MA plans is a county or multiple counties, and for MA regional plans is a region approved by CMS within which an MA-eligible individual may enroll in a particular MA plan offered by an MA organization. Each MA plan must be available to all MA-eligible individuals within the plan's service area. Counties do not need to be contiguous and under limited circumstances, CMS may approve the inclusion of “partial” counties in a service area.