A health professional, health practitioner or healthcare provider (sometimes simply "provider") is an individual who provides preventive, curative, promotional or rehabilitative health care services in a systematic way to people, families or communities.
Internist Education & Training. An internist, also called a general internist or doctor of internal medicine, is a medical doctor that specializes in the diagnosis and medical (nonsurgical) treatment of adults. Internists provide long-term, comprehensive care and manage both common and complex diseases. An internist can serve as a primary care physician or as a consultant to other medical specialists. Many internists also are involved in research and teaching.
Like a nurse practitioner, though, a physician assistant can also diagnose disease and write prescriptions. However, everything that a physician assistant does is technically at the direction of a licensed physician (M.D. or D.O.).
These health care providers are registered nurses with additional education. Those who specialize in pediatrics generally have specific advanced training in caring for children. Nurse practitioners may work in your doctor's office as part of a physician-led team.