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Internal Medicine Providers in Mason City, IA

Browse 36 Internal Medicine providers listed in NPPES with a practice address in Mason City, Iowa.

36 Healthcare Providers

How Mason City compares with the U.S.

Mason City has 133 clinicians in Internal Medicine per 100,000 residents, 3.0 times the U.S. rate of 44.

That is 36 active clinicians in Internal Medicine with a practice address in Mason City, for a population of 27,050.

The Iowa rate is 27 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.

95% of clinicians in Internal Medicine in Mason City listed in the CMS Medicare file (19 of 20) accept Medicare assignment. That is similar to the Iowa share of 98%.

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.

10% of clinicians in Internal Medicine in Mason City listed in the CMS Medicare file (2 of 20) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the Iowa share of 17%.

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 Mason City, IA

Source: CMS PECOS
PECOS Enrolled Specialists 31 In Mason City, IA
Part B Lab & Imaging Eligible 30 Diagnostic Referrals
DME Ordering Eligible 30 Durable Medical Equipment
Home Health Agency Referrals 30 HHA Ordering Eligible
Showing 1โ€“20 of 36 providers
With recent CMS data first, then Aโ€“Z

Dr. Phillip D Alscher , MD

Internal Medicine

Active NPI Status
1000 4th St Sw, Suite Im, Mason City, IA 504012800
Phone: 6414226999
NPI Identifier 1700993888
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Dr. Luke John Carlson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1010 4th St Sw Ste 305, Mason City, IA 504012801
Phone: 6414285700
NPI Identifier 1457092165
View Full Profile

Dr. Vaughan Robert Cipperly , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414286300
NPI Identifier 1942235429
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Dr. Fnu Dayawa Da Agoons , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414286615
NPI Identifier 1083174429
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Dr. Tanvi Deshpande , MD

Internal Medicine

Active NPI Status
1010 4th St Sw, Suite 305, Mason City, IA 504012856
Phone: 6414285700
NPI Identifier 1760115315
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Dr. Patrick T Dunlay , DO

Internal Medicine

Active NPI Status
1000 4th St Sw, Suite Im, Mason City, IA 504012800
Phone: 6414226999
NPI Identifier 1811004294
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Dr. Melissa A Frame , MD

Internal Medicine

Active NPI Status
1631 4th St Sw Ste 114b, Mason City, IA 50401
Phone: 6414286000
NPI Identifier 1881796712
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Dr. Zachary S Fuller , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1010 4th St Sw, Ste 305, Mason City, IA 504012856
Phone: 6414285700
NPI Identifier 1770272031
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Dr. Jashan Gill , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
250 S Crescent Dr Ste 200, Mason City, IA 504012911
Phone: 6414945300
NPI Identifier 1447866579
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Dr. Matthew Robert Hardee , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1010 4th St Sw Ste 305, Mason City, IA 504012801
Phone: 6414285700
NPI Identifier 1548408867
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Dr. Adam Hoffmann , DO

Internal Medicine

Active NPI Status
250 S Crescent Dr Ste 200, Mason City, IA 504012911
Phone: 6414945300
NPI Identifier 1093339871
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Dr. Burt Humburg , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414287000
NPI Identifier 1013134469
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Dr. Mark C Johnson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
910 N Eisenhower Ave, Mason City, IA 504012800
Phone: 6414287799
NPI Identifier 1013923127
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Dr. Smitha A Kanak , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
621 S Illinois Ave, Mason City, IA 504015489
Phone: 6414943000
NPI Identifier 1326279704
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Dr. Janice A Kirsch , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1631 4th St Sw, Mason City, IA 504011612
Phone: 6414226000
NPI Identifier 1992809636
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Dr. Ali H Mardan , PhD, MD, RPVI, FACP

Internal Medicine

Active NPI Status
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414288001
NPI Identifier 1619905353
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Hersi Cabdi Moallin

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1631 4th St Sw Ste 114b, Mason City, IA 504011612
Phone: 6414286000
NPI Identifier 1154818953
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Dr. Jose Morales Oliva , MD

Internal Medicine

Active NPI Status
1010 4th St Sw, Suite 305, Mason City, IA 504012856
Phone: 6414285700
NPI Identifier 1548943509
View Full Profile

Dr. Umer Mukhtar , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414286615
NPI Identifier 1750802849
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Dr. Dominick Myers , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 4th St Sw, Mason City, IA 504012800
Phone: 6414287000
NPI Identifier 1932770740
View Full Profile

Frequently Asked Questions about Internal Medicine in Mason City

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 Iowa 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.