Independent US Healthcare Provider Directory & Public Medical Database Patient Guides
Medical Specialty Listing

Internal Medicine Providers in Lake Forest, IL

Browse 25 Internal Medicine providers listed in NPPES with a practice address in Lake Forest, Illinois.

25 Healthcare Providers

How Lake Forest compares with the U.S.

Lake Forest has 129 clinicians in Internal Medicine per 100,000 residents, 2.9 times the U.S. rate of 44.

That is 25 active clinicians in Internal Medicine with a practice address in Lake Forest, for a population of 19,416.

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 Lake Forest listed in the CMS Medicare file (14 of 14) accept Medicare assignment. That is similar to the Illinois 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 Lake Forest listed in the CMS Medicare file (3 of 14) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than 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 Lake Forest, IL

Source: CMS PECOS
PECOS Enrolled Specialists 19 In Lake Forest, IL
Part B Lab & Imaging Eligible 19 Diagnostic Referrals
DME Ordering Eligible 19 Durable Medical Equipment
Home Health Agency Referrals 19 HHA Ordering Eligible
Showing 1โ€“20 of 25 providers
With recent CMS data first, then Aโ€“Z
Active NPI Status Accepts Medicare Assignment Telehealth Services Available
800 N Westmoreland Rd Ste 201, Lake Forest, IL 600451687
Phone: 8475357157
NPI Identifier 1619350410
View Full Profile

Dr. Scott Edward Braunlich , MD

Internal Medicine

Active NPI Status
800 N Westmoreland Rd, Suite 100, Lake Forest, IL 600451673
Phone: 8472348866
NPI Identifier 1487638904
View Full Profile

Dr. Kurt Jeffrey Brotherson , MD

Internal Medicine

Active NPI Status
700 N Westmoreland Rd, Bldg B, Lake Forest, IL 600451679
Phone: 8474820136
NPI Identifier 1306907779
View Full Profile

Dr. Sean Brett Connolly , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 N Westmoreland Rd, Lake Forest, IL 600451658
Phone: 8472345600
NPI Identifier 1346602877
View Full Profile

Dr. Elisabeth K Cormier , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1000 N Westmoreland Rd, Lake Forest, IL 600451658
Phone: 8479980862
NPI Identifier 1891781241
View Full Profile

Dr. Jennifer Dimond , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
915 S Waukegan Rd, Lake Forest, IL 600452654
Phone: 8472348866
NPI Identifier 1669932737
View Full Profile

Dr. Jason T Garti , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
800 N Westmoreland Rd, Suite 100, Lake Forest, IL 600451673
Phone: 8472348866
NPI Identifier 1003890500
View Full Profile

Dr. Michael Kolozsvary-Kiss , MD

Internal Medicine

Active NPI Status
800 N Westmoreland Rd Ste 102, Lake Forest, IL 600451687
Phone: 5617683044
NPI Identifier 1760829733
View Full Profile

Dr. Steven Matthew Lasin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
990 S Waukegan Rd Ste 200, Lake Forest, IL 600452654
Phone: 8472348100
NPI Identifier 1477574945
View Full Profile

Dr. Barry S. Levin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
915 S Waukegan Rd Ste 200, Lake Forest, IL 600452654
Phone: 2245164108
NPI Identifier 1043324254
View Full Profile

Dr. Mark A Rudberg , MD MPH

Internal Medicine

Active NPI Status Accepts Medicare Assignment
800 N Westmoreland Rd, Ste 101, Lake Forest, IL 600451687
Phone: 8472346363
NPI Identifier 1295838647
View Full Profile

Vivian W. Salazar

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
915 S Waukegan Rd Ste 200, Lake Forest, IL 600452654
Phone: 8472348866
NPI Identifier 1184704595
View Full Profile

Dr. Gary Edward Schaffel , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
990 S Waukegan Rd Ste 200, Lake Forest, IL 600452654
Phone: 8472348100
NPI Identifier 1336123884
View Full Profile

Dr. William B Seiden , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
800 N Westmoreland Rd Ste 201, Lake Forest, IL 600451687
Phone: 6082426850
NPI Identifier 1407915978
View Full Profile

Dr. Mohammed Siddique , MD

Internal Medicine

Active NPI Status
490 Turicum Rd, Lake Forest, IL 600453364
Phone: 8472342197
NPI Identifier 1659683951
View Full Profile

Dr. Richard Justus Siebert , MD

Internal Medicine

Active NPI Status
700 N Westmoreland Rd, Lake Forest, IL 600451679
Phone: 8472348808
NPI Identifier 1205985157
View Full Profile

Dr. Michael Jon Sommerfeld , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
915 S Waukegan Rd Ste 200, Lake Forest, IL 600452654
Phone: 2245164108
NPI Identifier 1578547063
View Full Profile

Dr. Marissa Jane Versalle , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
990 S Waukegan Rd Fl 2, Lake Forest, IL 600452654
Phone: 8478610025
NPI Identifier 1669891107
View Full Profile

Dr. David Vigder , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
800 N Westmoreland Rd, Suite 206, Lake Forest, IL 600451673
Phone: 8476152227
NPI Identifier 1780773994
View Full Profile

Dr. Seema Widhani Bhatia , MD

Internal Medicine

Active NPI Status
10 W Westleigh Rd, Lake Forest, IL 600452802
Phone: 8479100298
NPI Identifier 1811032469
View Full Profile

Frequently Asked Questions about Internal Medicine in Lake Forest

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.