Is an Internal Medicine Doctor Considered a Specialist?

Yes — and also, often, no

The question comes up because "specialist" means two different things in American healthcare, and an internal medicine doctor sits squarely on the fault line between them.

In the training sense, yes. Internal medicine is a medical specialty. A physician becomes an internist by completing a dedicated three-year residency in internal medicine — a program structure described by the ACGME — and can then pursue board certification through the American Board of Internal Medicine. The American College of Physicians describes internists as specialists who apply scientific knowledge and clinical expertise to the care of adults. So an internist is, by definition, a specialist in adult medicine.

In the insurance-and-referral sense, usually no. Health plans typically sort physicians into "primary care" and "specialist" buckets, and general internists are almost always listed as primary care physicians — the doctor you can see without a referral, often with a lower copay tier. In that everyday sense, the "specialists" are the physicians you get referred to: cardiologists, gastroenterologists, and so on.

Both statements are accurate. The confusion is in the word, not the medicine.

Where subspecialists fit

Here's the wrinkle that makes the terminology genuinely useful to understand: many of the doctors your plan calls "specialists" are also internists. Cardiology, gastroenterology, endocrinology, rheumatology, pulmonology, and several other fields are subspecialties of internal medicine. A cardiologist typically completed an internal medicine residency first, then additional fellowship training in cardiology.

So the internal medicine family tree looks like this:

• General internist — completed internal medicine residency; commonly practices primary care for adults or works as a hospitalist.
• Internal medicine subspecialist — completed the same residency, then a fellowship; practices a narrower field like cardiology or nephrology.

When someone asks whether an "internal medicine doctor" is a specialist, they're usually picturing the general internist. The general internist has specialist-level training in adult medicine but plays the primary care role in the system.

Why the distinction matters in practice

• Choosing a primary care doctor. If you're an adult picking a PCP from an insurance directory, general internists and family physicians both appear under primary care. The differences between them are covered in our page on internists vs. family doctors — the short version is that internists train exclusively in adult medicine, while family physicians train across all ages.
• Reading a referral. If your internist refers you to "a specialist," that usually means a subspecialist — quite possibly another internist with fellowship training.
• Reading credentials. Board certification in internal medicine, and any subspecialty certifications, are separate line items. A physician's degree (MD or DO) is yet another separate thing from their specialty — that distinction has its own page.

A note on the word "internal"

"Internal medicine" doesn't mean the doctor only treats internal organs, and an internist is not the same as an "intern" — a first-year resident of any specialty. The ACP's overview of the specialty is the cleanest official statement of what the field actually covers: the prevention, diagnosis, and treatment of illness in adults, from routine care to complex, multi-system disease. For guidance on what adult preventive care generally involves, the ACP's clinical resources and MedlinePlus are both written for exactly that territory.