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Internal Medicine Providers in Darien, CT

Browse 15 Internal Medicine providers listed in NPPES with a practice address in Darien, Connecticut.

15 Healthcare Providers

How Darien compares with the U.S.

Darien has 68 clinicians in Internal Medicine per 100,000 residents, about 1.5 times the U.S. rate of 44.

That is 15 active clinicians in Internal Medicine with a practice address in Darien, for a population of 21,936.

That is close to the Connecticut rate of 72.

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.

90% of clinicians in Internal Medicine in Darien listed in the CMS Medicare file (9 of 10) accept Medicare assignment. That is similar to the Connecticut share of 94%.

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.

50% of clinicians in Internal Medicine in Darien listed in the CMS Medicare file (5 of 10) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the Connecticut share of 34%.

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 Darien, CT

Source: CMS PECOS
PECOS Enrolled Specialists 11 In Darien, CT
Part B Lab & Imaging Eligible 11 Diagnostic Referrals
DME Ordering Eligible 11 Durable Medical Equipment
Home Health Agency Referrals 11 HHA Ordering Eligible
Showing 1โ€“15 of 15 providers
With recent CMS data first, then Aโ€“Z

Dr. Gene Balboa , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
40 Heights Rd, Suite 201, Darien, CT 068204132
Phone: 2036628900
NPI Identifier 1841366820
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Margaret Baran

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1500 Post Rd Ste 100, Darien, CT 068205936
Phone: 2036558749
NPI Identifier 1285623843
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Dr. Susan M Collins , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1500 Post Rd, First Floor, Darien, CT 068205935
Phone: 2036558749
NPI Identifier 1306877626
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Dr. Amanda C Collins- Baine , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
53 Old Kings Hwy N Ste 205, Darien, CT 068204735
Phone: 2032865604
NPI Identifier 1154340040
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Dr. Mark Dam , MD

Internal Medicine

Active NPI Status
40 Heights Rd, Darien, CT 068204132
Phone: 2036628900
NPI Identifier 1720005507
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Dr. James Richard Dorr , MD

Internal Medicine

Active NPI Status
1500 Post Rd, 1st Floor, Suite 100, Darien, CT 068205935
Phone: 2036558749
NPI Identifier 1427367705
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Dr. William James Giesen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Post Rd., Darien, CT 06820
Phone: 2036552516
NPI Identifier 1124104724
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Karthik Gunachelvan

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1500 Post Rd Ste 100, Darien, CT 068205936
Phone: 2036558749
NPI Identifier 1740604941
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Dr. Robert A Lindberg , MD

Internal Medicine

Active NPI Status
1500 Post Rd, Darien, CT 068205935
Phone: 2036561012
NPI Identifier 1295897973
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Dr. Charles Miner , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Post Rd, First Floor, Darien, CT 068205935
Phone: 2032764801
NPI Identifier 1487689170
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Dr. Qurat Mudassar , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
40 Heights Rd, Darien, CT 068204132
Phone: 2036628900
NPI Identifier 1871907113
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Dr. Philip E Negus , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1500 Post Rd, First Floor, Darien, CT 068205935
Phone: 2032764801
NPI Identifier 1629003413
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Dr. Michael B. Schwartz , DO

Internal Medicine

Active NPI Status
36 Old Kings Hwy S, Darien, CT 06820
Phone: 2036628900
NPI Identifier 1811918683
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Dr. Sujana Sunkara , MD

Internal Medicine

Active NPI Status
1500 Post Rd, Darien, CT 068205935
Phone: 2036558749
NPI Identifier 1306150875
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Dr. Carolyn Langelier , MD

Internal Medicine

Active NPI Status
103 Stephen Mather Rd, Darien, CT 068202232
Phone: 2036551486
NPI Identifier 1780930933
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Frequently Asked Questions about Internal Medicine in Darien

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 Connecticut 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.

Other Specialties in Darien

Internal Medicine Providers in Other Connecticut Cities

Cities with the most listed practitioners first.