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Internal Medicine - Nephrology Specialists in Portland, ME

Browse 24 Internal Medicine - Nephrology providers listed in NPPES with a practice address in Portland, Maine.

24 Healthcare Providers

How Portland compares with the U.S.

Portland has 35 clinicians in Internal Medicine - Nephrology per 100,000 residents, 8.7 times the U.S. rate of 4.0.

That is 24 active clinicians in Internal Medicine - Nephrology with a practice address in Portland, for a population of 68,854.

The Maine rate is 3.6 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.

100% of clinicians in Internal Medicine - Nephrology in Portland listed in the CMS Medicare file (19 of 19) accept Medicare assignment. That is similar to the Maine share of 97%.

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.

37% of clinicians in Internal Medicine - Nephrology in Portland listed in the CMS Medicare file (7 of 19) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the Maine share of 26%.

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 - Nephrology Medicare (PECOS) Enrollment & Ordering Eligibility

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

Source: CMS PECOS
PECOS Enrolled Specialists 22 In Portland, ME
Part B Lab & Imaging Eligible 22 Diagnostic Referrals
DME Ordering Eligible 22 Durable Medical Equipment
Home Health Agency Referrals 22 HHA Ordering Eligible
Showing 1โ€“20 of 24 providers
With recent CMS data first, then Aโ€“Z

Dr. Michael Christopher Akom , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1508827585
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Dr. Zain Mousa Aref Alshanableh , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1972159598
View Full Profile

Dr. Jonathan Amatruda , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1912387713
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Dr. Carl J. Blond , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600 Congress St, Portland, ME 041022143
Phone: 2077745222
NPI Identifier 1174507776
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Dr. Patricia L Cantlin , DO

Internal Medicine - Nephrology

Active NPI Status
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1275533994
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Dr. Ioan Cosma , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1356540454
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Dr. Gary Diperna , DO

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1649567579
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Dr. Stepfany Fuentes , DO

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600 Congress St, Portland, ME 041022143
Phone: 2077745222
NPI Identifier 1972024065
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Dr. Robert Morse Hayden , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1912468778
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Dr. Sean Andrew Hebert , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
43 Baxter Blvd, Portland, ME 041011823
Phone: 2076627180
NPI Identifier 1457609638
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Eric Holmes , PA-C

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1740540293
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Dr. Robert Tristian Isom , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1356428072
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Dr. Hassan Mahmoud , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1720440712
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Dr. Mahendra Mangray , MD

Internal Medicine - Nephrology

Active NPI Status
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1801074919
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Dr. Grant Oakley , DO

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1679927537
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Dr. Mark Godfrey Parker , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
22 Bramhall St, Portland, ME 041023134
Phone: 2076620111
NPI Identifier 1770583346
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Dr. Paul A Parker , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1600b Congress St, Portland, ME 041022124
Phone: 2077745222
NPI Identifier 1649278029
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Dr. Abd Assalam Qannus , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
22 Bramhall St Rm 5219, Portland, ME 041023134
Phone: 2076627872
NPI Identifier 1184133746
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Dr. Alan Scott Segal , MD

Internal Medicine - Nephrology

Active NPI Status
1600 Congress St Ste 2, Portland, ME 041022143
Phone: 2077745222
NPI Identifier 1659453223
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Dr. Prasheen Piyush Shah , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1600 Congress St Ste B, Portland, ME 041022148
Phone: 2077745222
NPI Identifier 1093247611
View Full Profile

Frequently Asked Questions about Internal Medicine - Nephrology in Portland

How do I check a Internal Medicine - Nephrology 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.