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What does an internal medicine doctor do?

An internal medicine doctor, or internist, is a physician who cares for adults. Internists diagnose and treat many conditions and manage long-term illness.

Last updated November 11, 2026

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When people see one

  • Yearly adult checkups
  • Managing diabetes, heart disease, or high blood pressure
  • Symptoms that need a workup
  • A referral to a specialist

How it differs

Family medicine doctor: Internists see adults only. Family medicine doctors also see children and can care for a whole household.

Geriatrician: Many internists see older adults, but a geriatrician has extra training in the care of people who are usually 65 and older.

On 2027 Colorado plans

Do you need a referral? No. You don't need a referral for primary care.

What a visit costs (the plan's filed "Primary Care Visit to Treat an Injury or Illness" benefit, in network, before any extra savings on silver plans):

  • Bronze: $25 to $50 a visit on 23 of 56 plans; on the other 33, you pay toward your deductible or a share of the bill.
  • Silver: $0 to $40 a visit on 53 of 58 plans; on the other 5, you pay toward your deductible or a share of the bill.
  • Gold: $0 to $30 a visit on 26 of 30 plans; on the other 4, you pay toward your deductible or a share of the bill.

In-network care costs less. Out-of-network visits on an HMO or EPO usually aren't covered except in an emergency.

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In Colorado

Public records list 2,979 internal medicine doctors at 893 Colorado locations.

Counties with the fewest: San Juan (1), Prowers (1), Moffat (1), Huerfano (1), Custer (1). 21 counties have none.

Questions to ask the office

  • Are you taking new patients?
  • Which 2027 plans do you take? Ask for the plan's network name, not only the insurance company.
  • Do you manage ongoing conditions like diabetes in the office?
  • Which hospital do you send patients to?

Sources

General information, not medical advice. Plan facts come from each plan's 2027 filing; confirm in the plan's summary of benefits.

Want help finding internal medicine doctors on your plan?

A licensed Grove advisor can answer your question at no cost. Insurance companies pay us, and your premium is the same either way.

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