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Internal Medicine Providers in Crystal Lake, IL

Browse 18 Internal Medicine providers listed in NPPES with a practice address in Crystal Lake, Illinois.

18 Healthcare Providers

How Crystal Lake compares with the U.S.

Crystal Lake has 44 clinicians in Internal Medicine per 100,000 residents, close to the U.S. rate of 44.

That is 18 active clinicians in Internal Medicine with a practice address in Crystal Lake, for a population of 40,579.

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.

100% of clinicians in Internal Medicine in Crystal Lake listed in the CMS Medicare file (15 of 15) 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.

47% of clinicians in Internal Medicine in Crystal Lake listed in the CMS Medicare file (7 of 15) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher 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 Crystal Lake, IL

Source: CMS PECOS
PECOS Enrolled Specialists 18 In Crystal Lake, IL
Part B Lab & Imaging Eligible 18 Diagnostic Referrals
DME Ordering Eligible 18 Durable Medical Equipment
Home Health Agency Referrals 18 HHA Ordering Eligible
Showing 1โ€“18 of 18 providers
With recent CMS data first, then Aโ€“Z

Dr. Mukesh Arora , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
690 E Terra Cotta Ave, Suite D, Crystal Lake, IL 600143605
Phone: 8154558600
NPI Identifier 1518975796
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Dr. Syed S Asghar , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
80 N Virginia St, Suite A, Crystal Lake, IL 600144158
Phone: 8154593030
NPI Identifier 1629182712
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Dr. Robert Brizzolara , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
650 Dakota St Ste A, Crystal Lake, IL 600123744
Phone: 8154556000
NPI Identifier 1265677199
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Dr. Barbara Frances Burrell , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 Dakota St Ste A, Crystal Lake, IL 60012
Phone: 8154556000
NPI Identifier 1417055765
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Dr. Gilbert N Egekeze , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
5911 Northwest Hwy, #205, Crystal Lake, IL 600148065
Phone: 8154777800
NPI Identifier 1548361959
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Dr. Lindsay Morgan Esch , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 Dakota St Ste A, Crystal Lake, IL 60012
Phone: 8153386600
NPI Identifier 1407110034
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Dr. George B. Gancayco , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
781 Mchenry Ave, Crystal Lake, IL 600147444
Phone: 8154592200
NPI Identifier 1477566834
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Dr. Sanjeev Gupta , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
525 E Congress Pkwy Ste 350, Crystal Lake, IL 600146271
Phone: 8154797490
NPI Identifier 1659471175
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Dr. Syed Waseem Haider , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 Dakota St Ste A, Crystal Lake, IL 600123744
Phone: 8154556000
NPI Identifier 1912017898
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Dr. Jonathan Huang , MD

Internal Medicine

Active NPI Status
650 Dakota St, Suite A, Crystal Lake, IL 600123744
Phone: 8154556000
NPI Identifier 1922374024
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Dr. Daniela Huerta De Hathaway , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 Dakota St Ste A, Crystal Lake, IL 60012
Phone: 8153386600
NPI Identifier 1235390154
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Dr. Carol Anne Kotzan , MD

Internal Medicine

Active NPI Status
525 E Congress Parkway Suite 250, Crystal Lake, IL 600146258
Phone: 8154557200
NPI Identifier 1710950100
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Dr. Zbigniew Thaddeus Lorenc , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
360 Station Drive, Crystal Lake, IL 60014
Phone: 8153386600
NPI Identifier 1902879380
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Dr. Sonia C Mehta , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
360 Station Dr, Crystal Lake, IL 60014
Phone: 8153386600
NPI Identifier 1265459895
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Dr. Raman I Popli , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
145 S Virginia St Ste C, Crystal Lake, IL 600147226
Phone: 8153636055
NPI Identifier 1013928712
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Abhirami Ravichandran

Internal Medicine

Active NPI Status Accepts Medicare Assignment
875 S Route 31, Crystal Lake, IL 600148190
Phone: 7792205500
NPI Identifier 1942652409
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Dr. Marvin John Salzmann , MD

Internal Medicine

Active NPI Status
460 Coventry Ln, Crystal Lake, IL 600147561
Phone: 8154551344
NPI Identifier 1558342923
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Dr. William Arthur Stinson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 Dakota St Ste A, Crystal Lake, IL 60012
Phone: 8153386600
NPI Identifier 1336112911
View Full Profile

Frequently Asked Questions about Internal Medicine in Crystal Lake

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.