Emergency Medicine Providers in San Marcos, TX
Browse 11 Emergency Medicine providers listed in NPPES with a practice address in San Marcos, Texas.
How San Marcos compares with the U.S.
San Marcos has 16 clinicians in Emergency Medicine per 100,000 residents, about 74% of the U.S. rate of 21.
That is 11 active clinicians in Emergency Medicine with a practice address in San Marcos, for a population of 70,897.
That is close to the Texas rate of 16.
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 Emergency Medicine in San Marcos 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 Registry addresses can be out of date.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. Jessica Best , MD
Emergency Medicine
Dr. Myla J. Canales , MD
Emergency Medicine
Dr. Curtis Ryan Grote , MD
Emergency Medicine
Bradley Lawing
Emergency Medicine
Dr. Toan Leung , MD
Emergency Medicine
Dr. Jose Ovidio Pena , MD
Emergency Medicine
Dr. Katherine Alison Sides , MD
Emergency Medicine
Dr. John Dewey Whisenant , MD
Emergency Medicine
Dr. Grant David Williams , MD
Emergency Medicine
Dr. Daniel Patrick Loisel , DO
Emergency Medicine
Dr. Randolph Cochrane Seybold , MD
Emergency Medicine
Frequently Asked Questions about Emergency Medicine in San Marcos
Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the Texas 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 San Marcos
Emergency Medicine Providers in Other Texas Cities
Cities with the most listed practitioners first.