Internal Medicine - Gastroenterology Specialists in Fullerton, CA
Browse 10 Internal Medicine - Gastroenterology providers listed in NPPES with a practice address in Fullerton, California.
How Fullerton compares with the U.S.
Fullerton has 7.1 clinicians in Internal Medicine - Gastroenterology per 100,000 residents, 14% higher than the U.S. rate of 6.2.
That is 10 active clinicians in Internal Medicine - Gastroenterology with a practice address in Fullerton, for a population of 140,968.
The California rate is 5.5 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.
Too few clinicians in Internal Medicine - Gastroenterology in Fullerton 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 Registry addresses can be out of date.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@t-medinfo.com · Methodology
Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of November 2026. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).
Dr. Martin Carr , MD
Internal Medicine - Gastroenterology
Dr. Patrick Koo , MD
Internal Medicine - Gastroenterology
Thu Anne Mai
Internal Medicine - Gastroenterology
Dr. Sajen Mathews , MD
Internal Medicine - Gastroenterology
Dr. Richard F. Mcguire , MD
Internal Medicine - Gastroenterology
Dr. Yeeshun F Miao , MD
Internal Medicine - Gastroenterology
Dr. Kumkum Sarkar Patel , MD, MPH
Internal Medicine - Gastroenterology
Dr. Vijay Krishna Prabhakar , MD
Internal Medicine - Gastroenterology
Dr. Scott P Sainburg , MD
Internal Medicine - Gastroenterology
Dr. Eugene Jay Yoon , MD
Internal Medicine - Gastroenterology
Frequently Asked Questions about Internal Medicine - Gastroenterology in Fullerton
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.
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.
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