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Internal Medicine Providers in Alton, IL

Browse 21 Internal Medicine providers listed in NPPES with a practice address in Alton, Illinois.

21 Healthcare Providers

How Alton compares with the U.S.

Alton has 83 clinicians in Internal Medicine per 100,000 residents, about 1.9 times the U.S. rate of 44.

That is 21 active clinicians in Internal Medicine with a practice address in Alton, for a population of 25,279.

The Illinois rate is 57 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 in Alton listed in the CMS Medicare file (10 of 10) accept Medicare assignment. That is similar to the Illinois share of 96%.

Only 10 of 21 active clinicians in Internal Medicine in Alton appear in the CMS Medicare file, so this share describes that smaller group.

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.

40% of clinicians in Internal Medicine in Alton listed in the CMS Medicare file (4 of 10) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the Illinois share of 35%.

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 Alton, IL

Source: CMS PECOS
PECOS Enrolled Specialists 12 In Alton, IL
Part B Lab & Imaging Eligible 12 Diagnostic Referrals
DME Ordering Eligible 13 Durable Medical Equipment
Home Health Agency Referrals 12 HHA Ordering Eligible
Showing 1โ€“20 of 21 providers
With recent CMS data first, then Aโ€“Z

Dr. William Ray Bartley , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Professional Dr, Suite 220, Alton, IL 620025068
Phone: 6184638626
NPI Identifier 1134112097
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Dr. Colin M Butterfield , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2 Saint Anthonys Way, Suite 205, Alton, IL 620024569
Phone: 6184622222
NPI Identifier 1952417578
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Dr. Christopher R Green , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
2 Memorial Dr, Suite 220, Alton, IL 620026723
Phone: 6184741723
NPI Identifier 1568479939
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Dr. John A Hoelscher , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2 Memorial Dr Ste 220, Alton, IL 620026723
Phone: 6184741723
NPI Identifier 1447267810
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Dr. Joanna E. Janas-Kaminsky , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
#2 Saint Anthony's Way, Suite 205, Alton, IL 620024569
Phone: 6184658019
NPI Identifier 1194811430
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Dr. D'andrienne C. Jones , MD

Internal Medicine

Active NPI Status
2416 Bloomer Drive, Alton, IL 62002
Phone: 6184659500
NPI Identifier 1760455661
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Dr. Eric Shing Lee , MD

Internal Medicine

Active NPI Status
1251 College Ave, Alton, IL 620026735
Phone: 8009799595
NPI Identifier 1306221346
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Dr. Christopher W Pottmeyer , MD

Internal Medicine

Active NPI Status
1 Saint Anthonys Way, Alton, IL 620024568
Phone: 6184652571
NPI Identifier 1215044490
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Dr. Tariq L Quadri , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Professional Dr, Suite 220, Alton, IL 620025068
Phone: 6184638610
NPI Identifier 1275525271
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Dr. John Albert Richards , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Memorial Dr, Alton, IL 620026755
Phone: 6184637240
NPI Identifier 1508276288
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Dr. Stanley J Sidwell , MD

Internal Medicine

Active NPI Status
1 Memorial Dr, Alton, IL 620026722
Phone: 6184637240
NPI Identifier 1073529475
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Dr. Erik Christian Stabell , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Professional Dr, Suite 220, Alton, IL 620025068
Phone: 6184638610
NPI Identifier 1609868108
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Dr. Kristen M Stabell , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Professional Dr, Suite 220, Alton, IL 620025068
Phone: 6184638610
NPI Identifier 1689667529
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John C Wuellner

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2 Memorial Dr, Suite 220, Alton, IL 620026723
Phone: 6184741723
NPI Identifier 1558378927
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Dr. Edward B Blair , MD

Internal Medicine

Active NPI Status
2 Saint Anthonys Way, Suite 205, Alton, IL 620024569
Phone: 6184622222
NPI Identifier 1093821605
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Dr. Lawrence G Burch , MD

Internal Medicine

Active NPI Status
2 Saint Anthonys Way, Suite 205, Alton, IL 620024569
Phone: 6184658019
NPI Identifier 1467568089
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Dr. Sarnit Charnond , MD

Internal Medicine

Active NPI Status
550 Landmarks Blvd, Alton, IL 620026321
Phone: 6184635905
NPI Identifier 1497868491
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Dr. Robert Steven Edwards , MD

Internal Medicine

Active NPI Status
4434 Friarwood Dr, Alton, IL 620026925
Phone: 6184657016
NPI Identifier 1972610921
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Dr. Da Hea Seo , MD

Internal Medicine

Active NPI Status
2 Saint Anthonys Way, Suite 205, Alton, IL 620024569
Phone: 6184622222
NPI Identifier 1861651333
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Dr. Madhusudan Vallala , MD

Internal Medicine

Active NPI Status
2 Saint Anthonys Way, Suite 205, Alton, IL 620024569
Phone: 6184622222
NPI Identifier 1972516136
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Frequently Asked Questions about Internal Medicine in Alton

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 Illinois 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.