Emergency medical services are available on the South Rim and are again provided by the rangers in the area and clinic staff from the local health center. Primary care services are also available and are provided the North Country Health Care located in Grand Canyon, Arizona.
The North Rim is far from large medical facilities and any emergency medical issues are handled by the rangers. If you require emergency medical assistance you can dial 911 from any pay phone, hotel/motel room or cell phone. There is very sparse cell phone coverage on the North Rim so calling for help may not be possible. Be prepared to manage minor medical issues yourself.