Internal Medicine Providers in Diamond Bar, CA
Browse 11 Internal Medicine providers listed in NPPES with a practice address in Diamond Bar, California.
How Diamond Bar compares with the U.S.
Diamond Bar has 21 clinicians in Internal Medicine per 100,000 residents, about 46% of the U.S. rate of 44.
That is 11 active clinicians in Internal Medicine with a practice address in Diamond Bar, for a population of 53,355.
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.
Too few clinicians in Internal Medicine in Diamond Bar 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 Registry addresses can be out of date.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 · 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).
Dr. Lorindha F Argudo , MD
Internal Medicine
Dr. Steve Li Chan , MD
Internal Medicine
Dr. Chandan Gowda , DO
Internal Medicine
Dr. Michael Lawrence Kwok , MD
Internal Medicine
Dr. Manish Mehta , MD
Internal Medicine
Dr. Jonathan David Ou , MD
Internal Medicine
Dr. Yuh-Huey Wang , MD
Internal Medicine
Dr. Edwin T Chuong , MD
Internal Medicine
Dr. Claire Elizabeth Daniel , MD
Internal Medicine
Dr. Chengcong Wu , MD
Internal Medicine
Dr. Phillip A Wunder , DO
Internal Medicine
Frequently Asked Questions about Internal Medicine in Diamond Bar
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.
Other Specialties in Diamond Bar
Internal Medicine Providers in Other California Cities
Cities with the most listed practitioners first.