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Healthcare Providers & Facilities in Fullerton, CA

Public healthcare directory of 5,456 individual practitioners and 837 healthcare facilities located in Fullerton, California.

5,456 Practitioners
837 Facilities
193 Specialties

Medical Specialties in Fullerton

Select a specialty to view practitioner listings, practice locations, and qualifications.

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All Specialties in Fullerton

Specialties with enough public records for a comparison with U.S. figures, besides those named above, plus the 60 largest of 168 more with at least one listed practitioner. Number of practitioners in brackets.

Dietary & Nutritional Service Providers

Nursing Service Providers

Nursing Service Related Providers

Other Service Providers

Podiatric Medicine & Surgery Service Providers

Featured Healthcare Providers in Fullerton

Practitioner profiles in Fullerton, CA with recent CMS Medicare or Open Payments data.

Michael Medina , PA

Physician Assistant

Medicare Accepted
100 E Valencia Mesa Dr Ste 310, Fullerton, CA
Phone: 7147343120
NPI 1801536784

Dr. Bang Nguyen , DO

Hospitalist

Medicare Accepted
101 E Valencia Mesa Dr, Fullerton, CA
Phone: 7144475027
NPI 1861477044

Collin Fuhrman , PA-C

Physician Assistant

101 E Valencia Mesa Dr, Fullerton, CA
Phone: 7146268500
NPI 1902439938

Dr. David Pretzinger , DC

Chiropractor

Medicare Accepted
220 Laguna Rd Ste 2, Fullerton, CA
Phone: 7142558343
NPI 1396248662

Dr. David Jawor , DDS

Dentist

501 N Cornell Ave, Fullerton, CA
Phone: 7145257757
NPI 1447436977

Deepti Ghiya

Psychiatry & Neurology - Psychiatry

2501 E Chapman Ave Ste 265, Fullerton, CA
Phone: 7147060206
NPI 1730422189

Largest Cities in California

Other California cities with a full directory, by the number of active practitioners listed in NPPES.

How Fullerton compares with the U.S.

Compared with the U.S. as a whole, Fullerton has more Optometrists (3.2x), clinicians in Internal Medicine - Endocrinology, Diabetes & Metabolism (2.5x) and clinicians in Physician Assistant - Surgical (2.2x) per 100,000 residents.

It has fewer clinicians in Nurse Practitioner - Psychiatric/Mental Health (45% of the U.S. rate), clinicians in Emergency Medicine (50%) and clinicians in Family Medicine (53%) per 100,000 residents.

Fullerton has 3,870 active clinicians per 100,000 residents, compared with 2,198 for the U.S.

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.

94% of clinicians in Fullerton listed in the CMS Medicare file (524 of 559) accept Medicare assignment. That is similar to the California share of 91%.

Only 559 of 5,456 active clinicians in Fullerton appear in the CMS Medicare file, so this share describes that smaller group.

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.

27% of clinicians in Fullerton listed in the CMS Medicare file (152 of 559) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the California share of 28%.

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).

Fullerton CMS Healthcare & Financial Disclosures

CMS Part D Prescribers (2024), Open Payments (program year 2025), Medicare (PECOS) enrollment and Part B (2024) data for Fullerton, CA

Source: CMS public datasets

Healthcare operations in Fullerton, CA encompass 5,456 active individual practitioners and 837 registered medical facilities across 193 clinical specialties.

According to CMS Medicare Part D analytics for 2024, prescription drug volume in Fullerton accounts for $106.4 Million across 583,799 prescription claims. 902 local practitioners have a Medicare (PECOS) enrollment record. Open Payments data for program year 2025 list $1.3 Million in payments reported by companies to 515 local practitioners; a reported payment does not necessarily mean the financial relationship is improper.

Medicare Part D Prescriptions (2024) $106.4M 583,799 Prescription Claims Source: data.cms.gov
Open Payments Sunshine Act (2025) $1.3M 515 Recipients Disclosed A reported payment does not necessarily mean the financial relationship is improper. Source: openpaymentsdata.cms.gov
Medicare (PECOS) Enrollment 902 Enrolled Medicare Practitioners Source: data.cms.gov
Medicare Part B Allowed Volume (2024) $61.4M 983,838 Services Performed Source: data.cms.gov

CMS PECOS: Eligible to Order or Refer for Medicare in Fullerton

Part B Lab & Imaging Eligible: 684
Durable Medical Equipment (DME): 711
Home Health Agency (HHA): 591
Source: CMS Order and Referring