Healthcare Providers & Facilities in Union City, CA
Public healthcare directory of 1,014 individual practitioners and 155 healthcare facilities located in Union City, California.
Medical Specialties in Union City
Select a specialty to view practitioner listings, practice locations, and qualifications.
Pharmacist
Physical Therapist
Internal Medicine
Dentist
Obstetrics & Gynecology
All Specialties in Union City
Specialties with enough public records for a comparison with U.S. figures, besides those named above, plus the 60 largest of 104 more with at least one listed practitioner. Number of practitioners in brackets.
Allopathic & Osteopathic Physicians
- Dermatology (7)
- Family Medicine - Adult Medicine (3)
- Family Medicine - Geriatric Medicine (2)
- General Practice (10)
- Internal Medicine - Endocrinology, Diabetes & Metabolism (3)
- Internal Medicine - Rheumatology (2)
- Orthopaedic Surgery (2)
- Otolaryngology (6)
- Pediatrics (3)
- Physical Medicine & Rehabilitation (8)
- Preventive Medicine - Occupational Medicine (2)
- Psychiatry & Neurology - Psychiatry (9)
Behavioral Health & Social Service Providers
- Behavior Analyst (16)
- Behavior Technician (117)
- Counselor (16)
- Counselor - Addiction (Substance Use Disorder) (3)
- Counselor - Mental Health (16)
- Marriage & Family Therapist (20)
- Psychologist (16)
- Psychologist - Clinical (31)
- Psychologist - Clinical Child & Adolescent (3)
- Psychologist - Counseling (2)
- Social Worker (5)
- Social Worker - Clinical (30)
Chiropractic Providers
- Chiropractor (15)
Dental Providers
Dietary & Nutritional Service Providers
Eye and Vision Services Providers
Nursing Service Providers
Nursing Service Related Providers
Other Service Providers
- Acupuncturist (15)
- Case Manager/Care Coordinator (4)
- Community Health Worker (12)
- Specialist (6)
Pharmacy Service Providers
Physician Assistants & Advanced Practice Nursing Providers
Respiratory, Developmental, Rehabilitative and Restorative Service Providers
Speech, Language and Hearing Service Providers
Student, Health Care
Technologists, Technicians & Other Technical Service Providers
Featured Healthcare Providers in Union City
Practitioner profiles in Union City, CA with recent CMS Medicare or Open Payments data.
Dr. Kenneth Tuong Truong , DO
Internal Medicine
Nada Alkhairulla , RPH
Pharmacist
Dr. Matthew Wong , OD
Optometrist
Dr. Carmen Wong , PharmD
Pharmacist
Dr. Lynda Kay , MD
Family Medicine
Hang Tran , RPH
Pharmacist
Largest Cities in California
Other California cities with a full directory, by the number of active practitioners listed in NPPES.
How Union City compares with the U.S.
Compared with the U.S. as a whole, Union City has more clinicians in Ophthalmology (3.3x), Optometrists (2.0x) and clinicians in Dentist - General Practice (1.9x) per 100,000 residents.
It has fewer Physician Assistants (33% of the U.S. rate) and clinicians in Family Medicine (61%) per 100,000 residents.
Union City has 1,503 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.
92% of clinicians in Union City listed in the CMS Medicare file (156 of 169) accept Medicare assignment. That is similar to the California share of 91%.
Only 169 of 1,014 active clinicians in Union City 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.
21% of clinicians in Union City listed in the CMS Medicare file (36 of 169) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than 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).
Union City CMS Healthcare & Financial Disclosures
CMS Part D Prescribers (2024), Open Payments (program year 2025), Medicare (PECOS) enrollment and Part B (2024) data for Union City, CA
Healthcare operations in Union City, CA encompass 1,014 active individual practitioners and 155 registered medical facilities across 114 clinical specialties.
According to CMS Medicare Part D analytics for 2024, prescription drug volume in Union City accounts for $28.7 Million across 291,786 prescription claims. 292 local practitioners have a Medicare (PECOS) enrollment record. Open Payments data for program year 2025 list $0.0 Million in payments reported by companies to 65 local practitioners; a reported payment does not necessarily mean the financial relationship is improper.