According to a recent survey, among non-pediatric primary care physicians:

• 93% say they accept Medicare patients, 94% accept private insurance, and 67% accept Medicaid patients
• Among those accepting new patients, 72% say they accept new Medicare patients, 80% accept new patients with private insurance, and 45% accept new Medicaid patients
• 78% of those age 55 and older say they accept new patients, regardless of insurance
• 83% of those under age 55 accept new patients, regardless of insurance

Source: "Primary Care physicians accepting Medicare: A Snapshot ," The Henry J. Kaiser Family Foundation, October 2015, http://files.kff.org/attachment/data-note-primary-care-physicians-accepting-medicare-a-snapshot