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Internal Medicine Providers in Portland, ME

Browse 145 Internal Medicine providers listed in NPPES with a practice address in Portland, Maine.

145 Healthcare Providers

How Portland compares with the U.S.

Portland has 211 clinicians in Internal Medicine per 100,000 residents, 4.7 times the U.S. rate of 44.

That is 145 active clinicians in Internal Medicine with a practice address in Portland, for a population of 68,854.

The Maine rate is 43 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

93% of clinicians in Internal Medicine in Portland listed in the CMS Medicare file (96 of 103) accept Medicare assignment. That is similar to the Maine share of 96%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

21% of clinicians in Internal Medicine in Portland listed in the CMS Medicare file (22 of 103) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the Maine share of 24%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Internal Medicine Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine practitioners in Portland, ME

Source: CMS PECOS
PECOS Enrolled Specialists 125 In Portland, ME
Part B Lab & Imaging Eligible 127 Diagnostic Referrals
DME Ordering Eligible 128 Durable Medical Equipment
Home Health Agency Referrals 127 HHA Ordering Eligible
Showing 1โ€“20 of 145 providers
With recent CMS data first, then Aโ€“Z

Dr. Reid C Andress , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 04102
Phone: 2076624618
NPI Identifier 1518286798
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Dr. Jennifer G Aronson , MD

Internal Medicine

Active NPI Status
22 Bramhall St, Portland, ME 041023134
Phone: 2076626153
NPI Identifier 1538200951
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Dr. Victoria L Ashton , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
335 Brighton Ave, Portland, ME 041022362
Phone: 2078798511
NPI Identifier 1467533117
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Dr. Cynthia A. Atkinson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
84 Marginal Way, Portland, ME 04101
Phone: 2077745816
NPI Identifier 1487753125
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Dr. Jeffrey A Ball , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
66 Bramhall St, Portland, ME 041023344
Phone: 2076623157
NPI Identifier 1639515711
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Dr. Douglas R Barr , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
84 Marginal Way, Suite 700, Portland, ME 04101
Phone: 2077745816
NPI Identifier 1134180359
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Dr. Kristen Jennings Bartlett , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023175
Phone: 2076620111
NPI Identifier 1255892303
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Dr. Louisa Jacqueline Bauer , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023175
Phone: 2076620111
NPI Identifier 1811574668
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Dr. Timothy C Baum , MD

Internal Medicine

Active NPI Status
84 Marginal Way, Suite 800, Portland, ME 041012443
Phone: 2077745816
NPI Identifier 1922077601
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Dr. Timothy Bender , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023134
Phone: 2076624618
NPI Identifier 1841827284
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Dr. Ari S Berman , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
175 Fore River Pkwy, Portland, ME 041022779
Phone: 2078793000
NPI Identifier 1225015829
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Dr. Kirsten Berman , MD

Internal Medicine

Active NPI Status
175 Fore River Pkwy, Portland, ME 041022779
Phone: 2078578040
NPI Identifier 1043280431
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Dr. Shulamith C Bonham , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
180 Park Ave Ste 1, Portland, ME 041022927
Phone: 2078742141
NPI Identifier 1659568673
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Dr. Timothy Noel Botler , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023134
Phone: 2076624618
NPI Identifier 1730525312
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Active NPI Status Accepts Medicare Assignment Telehealth Services Available
84 Marginal Way Ste 700, Portland, ME 041012481
Phone: 2077745816
NPI Identifier 1598054702
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Dr. Eliza Bullis , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023134
Phone: 2076624618
NPI Identifier 1518257682
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Dr. Gregory Warren Burt , MD

Internal Medicine

Active NPI Status
141 W Commercial St, Portland, ME 041023905
Phone: 2076238411
NPI Identifier 1942490925
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Dr. Allison L. Buttarazzi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
84 Marginal Way, Portland, ME 041012443
Phone: 2077745816
NPI Identifier 1871939884
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Dr. Matthew Samuel Buttarazzi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023134
Phone: 2076626562
NPI Identifier 1447696422
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Dr. Katherine R Caldwell , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
84 Marginal Way, Ste 700, Portland, ME 041012443
Phone: 2077745816
NPI Identifier 1730257411
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Frequently Asked Questions about Internal Medicine in Portland

How do I check a Internal Medicine practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the Maine licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.