NPPES file of Aug 9, 2026

Doctors and health care providers in Union City, CA

1,006 individual NPPES records list a practice address in Union City, 187th of 812 California cities. The largest group is behavior technician: 117, 12% of the city's records, against 18% across California. Page 20 of 21.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

Union City in California

  • Rank in California187th of 812 cities by records
  • Share of the state0.1% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups25.4% of all records

Compared with California as a whole, Union City has 8.4× the state's share of speech-language assistant records and 0.32× its share of marriage & family therapist records.

Providers in Union City, alphabetically

  1. Kimberly WilliamsCounselor1659676864
  2. Laura Wilson, LMFTMarriage & Family Therapist1164966073
  3. Nanette Winterfelt, LCSWClinical Social Worker1508919051
  4. Agnieszka Wisniewska, M.D.Psychiatry Physician1659501708
  5. Anna Witanto, D.D.S.General Practice Dentistry1477693133
  6. Aryn WolfeClinical Social Worker1144783879
  7. Angela Wong, ODOptometrist1275195141
  8. Carmen Wong, PHARM.D.Pharmacist1376813865
  9. Cho Kui WongSpeech-Language Pathologist1225733116
  10. Connie Wong, O.D.Optometrist1205241593
  11. Ernest Wong, DMDGeneral Practice Dentistry1518526821
  12. Joshua Wong, DCChiropractor1710803648
  13. Matthew Wong, O.D.Optometrist1306101746
  14. Yvonne Wong, RPHPharmacist1154325975
  15. Andrew Woo, DDSGeneral Practice Dentistry1710039813
  16. Aja Wooden-Xenos, PSYDClinical Psychologist1679887343
  17. Wendy WrightSpeech-Language Assistant1760306112
  18. Christina Wu, M.D.Internal Medicine Physician1790837920
  19. Jeffery Wu, DPTPhysical Therapist1811509813
  20. Martha Wunsch, M.D.Pediatrics Physician1275709230
  21. Athena Xides, PHARMDPharmacist1831820125
  22. Song Qing Xue, L. ACAcupuncturist1629417027
  23. Christian Michael YabutBehavior Technician1699696484
  24. Jessica YangMarriage & Family Therapist1548748064
  25. Yuxiang Yang, MDFamily Medicine Physician1972131480
  26. Matthew Yap, PHARMDPharmacist1003428384
  27. Sean Yarber, COTAOccupational Therapy Assistant1144840596
  28. Nicholas Yatco, DDSGeneral Practice Dentistry1114124120
  29. Wilma Yaung, M.D.Internal Medicine Physician1437237294
  30. Roma Lee Ybera, OTR/LOccupational Therapist1851017164
  31. Amanda Yee, PHARMDPharmacist1245980481
  32. Kathleen YeePhysician Assistant1902683022
  33. Stephen Yee, O.D.Optometrist1952453045
  34. Amy Yeh, PHARMDPharmacist1447901244
  35. Sang Yi, PTPhysical Therapist1689738775
  36. Lauren YokomizoInternal Medicine Physician1073969184
  37. Justin Yoshihara, DMDDentist1649830969
  38. Stephen Young, M.D.Obstetrics & Gynecology Physician1790863546
  39. Amy YuPharmacist1356989214
  40. Jennyfer YuBehavior Technician1417730052
  41. Jessica Yu, PHARMDPharmacist1851704191
  42. Judy Yuen, PSYDClinical Psychologist1114153830
  43. Wing Yuen, PHARMDPharmacist1619499407
  44. Jean Zee, P.T.Physical Therapist1033256136
  45. Naweed ZemaryalaiPhlebotomy Technician1073443578
  46. Daniel ZenarosaPhysical Therapist1790606010
  47. Reema Zereh, D.C.Chiropractor1073648606
  48. Jessica ZhangOccupational Therapist1891534038
  49. Ying Zhang, M.D.Geriatric Medicine (Family Medicine) Physician1861665564
  50. Zuo Zhang, ACUPUNCTURISTAcupuncturist1205525029

The largest California cities

  1. Los Angeles69,537
  2. San Diego52,937
  3. San Francisco38,143
  4. Sacramento33,083
  5. San Jose20,925

All of California →

How to read this directory

Union City, California appears in the CMS National Plan and Provider Enumeration System with 1,006 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in Union City - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a Union City practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.

The provider mix in Union City is weighted toward Behavior Technician (117 clinicians, followed by Pharmacist with 75 and Speech-Language Pathologist with 64). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to California's population, Union City reports roughly 2.6 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.

Of California's most common specialties, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Union City practice address, a coverage gap Union City patients typically fill by traveling to a larger nearby hub.

For Union City patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.

For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.

Common questions

How many doctors are in Union City, CA?

There are 1,006 registered healthcare providers in Union City, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Union City?

The most common specialties in Union City are Behavior Technician, Pharmacist, Speech-Language Pathologist, Physical Therapist, General Practice Dentistry. Behavior Technician has the most providers with 117.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.