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Internal Medicine Providers in Vacaville, CA

Browse 53 Internal Medicine providers listed in NPPES with a practice address in Vacaville, California.

53 Healthcare Providers

How Vacaville compares with the U.S.

Vacaville has 52 clinicians in Internal Medicine per 100,000 residents, 16% higher than the U.S. rate of 44.

That is 53 active clinicians in Internal Medicine with a practice address in Vacaville, for a population of 102,596.

The California rate is 45 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 Vacaville listed in the CMS Medicare file (23 of 23) accept Medicare assignment. That is similar to the California share of 96%.

Only 23 of 53 active clinicians in Internal Medicine in Vacaville 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.

52% of clinicians in Internal Medicine in Vacaville listed in the CMS Medicare file (12 of 23) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the California share of 38%.

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 Vacaville, CA

Source: CMS PECOS
PECOS Enrolled Specialists 30 In Vacaville, CA
Part B Lab & Imaging Eligible 30 Diagnostic Referrals
DME Ordering Eligible 33 Durable Medical Equipment
Home Health Agency Referrals 30 HHA Ordering Eligible
Showing 1โ€“20 of 53 providers
With recent CMS data first, then Aโ€“Z

Dr. Hydee Baldos Abaya Ghazaleh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Quality Dr, Vacaville, CA 956889494
Phone: 7076242480
NPI Identifier 1922688464
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Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Quality Dr, Vacaville, CA 956889494
Phone: 7076244000
NPI Identifier 1093395535
View Full Profile

Dr. Kyaw Aung , MD

Internal Medicine

Active NPI Status
1 Quality Dr, Vacaville, CA 956889494
Phone: 7074535000
NPI Identifier 1386722114
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Dr. Kulbir K Bajwa , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
421 Nut Tree Rd, Vacaville, CA 956873508
Phone: 7076247500
NPI Identifier 1912000126
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Dr. Anne An-Ru Chen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
770 Mason St, Vacaville, CA 956884646
Phone: 7074274900
NPI Identifier 1003852708
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Dr. Garth Gene Davis , MD

Internal Medicine

Active NPI Status
421 Nut Tree Rd, Vacaville, CA 956873508
Phone: 7076247500
NPI Identifier 1770535692
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Dr. Angeli Duran , MD, DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
770 Mason St, Vacaville, CA 956884646
Phone: 7074274900
NPI Identifier 1801144050
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Dr. Thomas Daniel Erskine , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1010 Nut Tree Rd, Ste 100, Vacaville, CA 956874172
Phone: 7076247979
NPI Identifier 1194732339
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Dr. Mohamed S Falaha , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Quality Dr, Vacaville, CA 956889494
Phone: 6502231835
NPI Identifier 1588196232
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Dr. Ali Hassani , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
421 Nut Tree Rd, Vacaville, CA 956873508
Phone: 7076247500
NPI Identifier 1487818373
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Dr. Eri Elizabeth Joyo , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Quality Dr Fl 3, Vacaville, CA 956889494
Phone: 7076242670
NPI Identifier 1821529512
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Dr. Andleeb K Judge , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
770 Mason St, Vacaville, CA 956884646
Phone: 7074545800
NPI Identifier 1932141124
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Dr. Frank G Karneges , DO

Internal Medicine

Active NPI Status
770 Mason St, Vacaville, CA 956884646
Phone: 7074545800
NPI Identifier 1336220581
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Dr. Gurjit Kaur , MD

Internal Medicine

Active NPI Status
600 Nut Tree Rd, Vacaville, CA 956874669
Phone: 7073591816
NPI Identifier 1922635580
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Dr. Sukhjinder Kaur , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
770 Mason St, Vacaville, CA 956884646
Phone: 7074274900
NPI Identifier 1255576591
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Dr. Richard G. Lasslo , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1 Quality Dr, Vacaville, CA 956889494
Phone: 7074535000
NPI Identifier 1467526780
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Dr. James C. Lee , MD

Internal Medicine

Active NPI Status
1 Quality Dr, Vacaville, CA 956889494
Phone: 7074535000
NPI Identifier 1134279847
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Dr. Morris M. Li , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Quality Dr, Vacaville, CA 956889494
Phone: 7076244000
NPI Identifier 1700964442
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Dr. Micheal Andrew Massoud , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Quality Dr, Vacaville, CA 956889494
Phone: 7076244000
NPI Identifier 1194183012
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Dr. Mary Judeline Minguito , MD

Internal Medicine

Active NPI Status
1 Quality Dr, Vacaville, CA 956889494
Phone: 7074535000
NPI Identifier 1912059718
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Frequently Asked Questions about Internal Medicine in Vacaville

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 California 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.