Independent US Healthcare Provider Directory & Public Medical Database Patient Guides
Medical Specialty Listing

Internal Medicine Providers in Duarte, CA

Browse 13 Internal Medicine providers listed in NPPES with a practice address in Duarte, California.

13 Healthcare Providers

How Duarte compares with the U.S.

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

That is 13 active clinicians in Internal Medicine with a practice address in Duarte, for a population of 22,184.

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.

Too few clinicians in Internal Medicine in Duarte are listed in the CMS Medicare file to report Medicare assignment or telehealth shares.

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 Registry addresses can be out of date.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. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Showing 1โ€“13 of 13 providers
With recent CMS data first, then Aโ€“Z

Dr. Karam Ashouri , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Duarte Rd, Duarte, CA 910103012
Phone: 8008264673
NPI Identifier 1518616200
View Full Profile

Dr. Stan Mathioulakis , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
931 Buena Vista St, Suite 102, Duarte, CA 910101712
Phone: 6263583204
NPI Identifier 1912080847
View Full Profile

Dr. Ulin Sargeant , MD, MPH

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1227 Buena Vista St, Suite #f, Duarte, CA 910102486
Phone: 8772544496
NPI Identifier 1992878151
View Full Profile

Dr. Indravadan Somalal Shah , MD

Internal Medicine

Active NPI Status
931 Buena Vista Street, #504, Duarte, CA 91010
Phone: 6263582576
NPI Identifier 1932126497
View Full Profile

Dr. Koral Shah , MD

Internal Medicine

Active NPI Status
1500 Duarte Rd, Duarte, CA 910103012
Phone: 8008264673
NPI Identifier 1124672613
View Full Profile

Dr. Mohammed Siddiqui , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Duarte Rd, Duarte, CA 910103012
Phone: 6262564673
NPI Identifier 1861056251
View Full Profile

Dr. Elizabeth Anne Smalley , MD

Internal Medicine

Active NPI Status
931 Buena Vista St, 405, Duarte, CA 910101712
Phone: 6263588901
NPI Identifier 1174596233
View Full Profile

Dr. Tomoko Tagawa , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1500 East Duarte Rd, Duarte, CA 91010
Phone: 6264719200
NPI Identifier 1285825414
View Full Profile

Dr. Razmik Thomassian , MD

Internal Medicine

Active NPI Status
1227 Buena Vista St Ste F, Duarte, CA 910102486
Phone: 8772544496
NPI Identifier 1518351733
View Full Profile

Dr. Gilbert Walton , MD

Internal Medicine

Active NPI Status
931 Buena Vista St, 405, Duarte, CA 910101712
Phone: 6263580269
NPI Identifier 1891738209
View Full Profile

Dr. Yu Wang , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Duarte Rd, Duarte, CA 910103012
Phone: 6262564673
NPI Identifier 1932170727
View Full Profile

Dr. Houman Badrzadeh , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Duarte Rd, Duarte, CA 910103012
Phone: 8008264673
NPI Identifier 1295380517
View Full Profile

Dr. Tyler Seto , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1500 Duarte Rd, Duarte, CA 910103012
Phone: 6262564673
NPI Identifier 1669579579
View Full Profile

Frequently Asked Questions about Internal Medicine in Duarte

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.