A doctor who is trained to give an insured basic care. The primary care doctor is the doctor an insured sees first for most health problems. The doctor makes sure that insureds get the care they need to stay healthy. The primary care doctor may also talk with other doctors and health care providers about the insured’s care and refer the insured to them. In many Medicare managed care plans, insureds must see their primary care doctor before they can see any other health care provider.