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Internal Medicine Providers in Martinez, CA

Browse 48 Internal Medicine providers listed in NPPES with a practice address in Martinez, California.

48 Healthcare Providers

How Martinez compares with the U.S.

Martinez has 130 clinicians in Internal Medicine per 100,000 residents, 2.9 times the U.S. rate of 44.

That is 48 active clinicians in Internal Medicine with a practice address in Martinez, for a population of 36,903.

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. 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 Martinez listed in the CMS Medicare file (14 of 14) accept Medicare assignment. That is similar to the California share of 96%.

Only 14 of 48 active clinicians in Internal Medicine in Martinez 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.

43% of clinicians in Internal Medicine in Martinez listed in the CMS Medicare file (6 of 14) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to 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 Martinez, CA

Source: CMS PECOS
PECOS Enrolled Specialists 32 In Martinez, CA
Part B Lab & Imaging Eligible 32 Diagnostic Referrals
DME Ordering Eligible 34 Durable Medical Equipment
Home Health Agency Referrals 32 HHA Ordering Eligible
Showing 1โ€“20 of 48 providers
With recent CMS data first, then Aโ€“Z

Dr. Abid H Ahmed , MD

Internal Medicine

Active NPI Status
2500 Alhambra Ave, Martinez, CA 94553
Phone: 9253705000
NPI Identifier 1346531001
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Dr. David R. Besley , MD

Internal Medicine

Active NPI Status
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1336227420
View Full Profile

Dr. Adam Marshall Buck , MD

Internal Medicine

Active NPI Status
2500 Alhambra Ave, Martinez, CA 945533156
Phone: 9253705000
NPI Identifier 1346564119
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Dr. Nusrat Ijaz Chaudhry , MD

Internal Medicine

Active NPI Status
2500 Alhambra Ave, Martinez, CA 945533156
Phone: 9253705200
NPI Identifier 1689829004
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Dr. Lauren Sue-Jung Choi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9252297756
NPI Identifier 1700271210
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Dr. George T. Chuang , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1235217324
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Dr. Kenton L. Chung , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1770661878
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Dr. David A. Fields , MD

Internal Medicine

Active NPI Status
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1831277938
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Dr. Jeremy Fish , MD

Internal Medicine

Active NPI Status
2500 Alhambra Avenue, Contra Costa Regional Medical Center And Health Centers, Martinez, CA 945533156
Phone: 9253705110
NPI Identifier 1952497943
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Dr. Yelena Gambarin , MD

Internal Medicine

Active NPI Status
150 Muir Rd # Hbpc11c3, Martinez, CA 945534668
Phone: 9253722131
NPI Identifier 1043412026
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Dr. Thomas Edward Gamsky , MD

Internal Medicine

Active NPI Status
10 Douglas Dr, Martinez, CA 945534077
Phone: 9253131100
NPI Identifier 1043296247
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Oliver Graham

Internal Medicine

Active NPI Status
2500 Alhambra Ave, Martinez, CA 945533156
Phone: 9253705110
NPI Identifier 1972705424
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Dr. Indu Gupta , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1881766632
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Dr. Steven A. Johnson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1861571531
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Dr. Sara Kate Levin , MD

Internal Medicine

Active NPI Status
2500 Alhambra Avenue, Contra Costa Regional Medical Center And Health Centers, Martinez, CA 945533156
Phone: 9253705110
NPI Identifier 1184707853
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Dr. Olga P. Likhacheva , MD

Internal Medicine

Active NPI Status
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1053499129
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Dr. Eunice Liu , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721669
NPI Identifier 1851575310
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Dr. Ekaterina V. Malinovsky , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1174675987
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Dr. Neeraja V. Maramreddy , MD

Internal Medicine

Active NPI Status
200 Muir Rd, Martinez, CA 945534614
Phone: 9253721000
NPI Identifier 1093893109
View Full Profile

Dr. Yu-Hung Patty Peng , MD

Internal Medicine

Active NPI Status
2500 Alhambra Ave, Martinez, CA 94553
Phone: 9253705000
NPI Identifier 1922298520
View Full Profile

Frequently Asked Questions about Internal Medicine in Martinez

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.