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Internal Medicine Providers in Riverside, CA

Browse 187 Internal Medicine providers listed in NPPES with a practice address in Riverside, California.

187 Healthcare Providers

How Riverside compares with the U.S.

Riverside has 59 clinicians in Internal Medicine per 100,000 residents, about 1.3 times the U.S. rate of 44.

That is 187 active clinicians in Internal Medicine with a practice address in Riverside, for a population of 319,069.

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.

97% of clinicians in Internal Medicine in Riverside listed in the CMS Medicare file (136 of 140) accept Medicare assignment. That is similar to the California 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.

28% of clinicians in Internal Medicine in Riverside listed in the CMS Medicare file (39 of 140) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower 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 Riverside, CA

Source: CMS PECOS
PECOS Enrolled Specialists 164 In Riverside, CA
Part B Lab & Imaging Eligible 164 Diagnostic Referrals
DME Ordering Eligible 165 Durable Medical Equipment
Home Health Agency Referrals 164 HHA Ordering Eligible
Showing 1โ€“20 of 187 providers
With recent CMS data first, then Aโ€“Z

Dr. Jacqueline Gesner Agcaoili , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
4440 Brockton Ave., Suite 320, Riverside, CA 92501
Phone: 9513696191
NPI Identifier 1124022108
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Dr. John Gaspar Agtuca , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
6900 Brockton Ave Ste 100, Riverside, CA 925063817
Phone: 9517813800
NPI Identifier 1306200183
View Full Profile

Dr. Zainab Ali , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
4646 Brockton Ave Ste 202-1, Riverside, CA 925060172
Phone: 9517742952
NPI Identifier 1437449048
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Dr. Mark David Allison , MD

Internal Medicine

Active NPI Status
4100 Central Ave, Suite 106, Riverside, CA 925062933
Phone: 9517888332
NPI Identifier 1164471223
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Dr. Sejad Al-Tahan , DO

Internal Medicine

Active NPI Status
3750 Arlington Ave, Riverside, CA 925062607
Phone: 9517743050
NPI Identifier 1871087874
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Dr. Joseph Alukal , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
3390 University Ave Ste 100, Riverside, CA 925013315
Phone: 8448278000
NPI Identifier 1801270699
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Dr. Arthur Kevin Calderon Amador , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 8335742273
NPI Identifier 1851850978
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Dr. Apoorva Ananth , MD

Internal Medicine

Active NPI Status
7117 Brockton Ave, Riverside, CA 925062658
Phone: 5107521933
NPI Identifier 1558866863
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Dr. Tamara Lynne Bautista Aqui , DO

Internal Medicine

Active NPI Status
4445 Magnolia Ave, Riverside, CA 925014135
Phone: 9517883274
NPI Identifier 1992333447
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Dr. Amir Asifuddin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 9513534226
NPI Identifier 1407148760
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Dr. Sammy R. Badawi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 9093532000
NPI Identifier 1073661971
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Dr. Caroline Anita Bakhit , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10895 Magnolia Ave, Riverside, CA 925053057
Phone: 9516024382
NPI Identifier 1013536069
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Dr. Javier Jose Barranco-Trabi , MD

Internal Medicine

Active NPI Status
900 University Ave, Riverside, CA 925219800
Phone: 9094752612
NPI Identifier 1154959013
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Evan Alexander Basical

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
14305 Meridian Pkwy, Riverside, CA 925183034
Phone: 8335742273
NPI Identifier 1164165031
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Dr. Jeffrey Jon Brand , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 9093532000
NPI Identifier 1659429553
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Brian Minh Bui

Internal Medicine

Active NPI Status Accepts Medicare Assignment
4445 Magnolia Ave, Riverside, CA 925014135
Phone: 9517883000
NPI Identifier 1982108262
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Dr. Gloria Gaeta Carreon , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
7117 Brockton Ave, Riverside, CA 925062658
Phone: 9517826260
NPI Identifier 1194937649
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Dr. Sarah Chae , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
4646 Brockton Ave Ste 201, Riverside, CA 925060104
Phone: 9515851800
NPI Identifier 1003872169
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Dr. Fiona Chai-Tom , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10800 Magnolia Ave, Riverside, CA 925053043
Phone: 8335742273
NPI Identifier 1174104848
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Dr. Jennifer J Chang , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
3865 Jackson St, Riverside, CA 92503
Phone: 7148697760
NPI Identifier 1831364991
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Frequently Asked Questions about Internal Medicine in Riverside

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.