NPPES file of Aug 9, 2026

Doctors and health care providers in Fountain Valley, CA

2,190 individual NPPES records list a practice address in Fountain Valley, 99th of 812 California cities. The largest group is behavior technician: 207, 9% of the city's records, against 18% across California. Page 5 of 44.

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

The 8 largest groups in Fountain Valley

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Fountain Valley in California

  • Rank in California99th of 812 cities by records
  • Share of the state0.2% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups20.6% of all records

Compared with California as a whole, Fountain Valley has 15.6× the state's share of other technician records and 0.31× its share of student in an organized health care education/training program records.

Providers in Fountain Valley, alphabetically

  1. Phong Bui, MDEndocrinology, Diabetes & Metabolism Physician1316177462
  2. Tam Bui, M.D.Otolaryngology Physician1215937859
  3. Thomas Bui, M.D.Family Medicine Physician1326361585
  4. Tina Bui, DNP, APRN, ACNPC-BCAcute Care Nurse Practitioner1760367833
  5. Rachel Buivids, M.S.P.T.Physical Therapist1003136482
  6. Valerie Bunker, M.S.Marriage & Family Therapist1609088327
  7. Laura Burnside, BTOther Technician1982077095
  8. Danielle Bustamante, BCBABehavior Analyst1215342977
  9. Gerardo Bustillo, M.D.Obstetrics & Gynecology Physician1972631786
  10. Eun Byun, MDSpecialist1861683047
  11. Dennis Cabrera, PHARMDPharmacist1275170524
  12. Alberto CacheroPhysical Therapist1245301092
  13. Lizbeth CadenaBehavior Technician1831960350
  14. Lisa Cai, PA-CMedical Physician Assistant1699243253
  15. Alondra CalvilloBehavior Technician1548988769
  16. Jacqueline CamberosCase Manager/Care Coordinator1033822036
  17. William Canaletti, PA-CMedical Physician Assistant1124056767
  18. Victoria CanizalesBehavior Technician1457054785
  19. Marie Cannon, LCSWSocial Worker1629190368
  20. Roselia Canseco CruzCase Manager/Care Coordinator1972160794
  21. Alan Cantillep, MDNephrology Physician1639517808
  22. Jessica CaoBehavior Technician1851264063
  23. Michael Cao, P.T.Physical Therapist1740390533
  24. Nhu-Van Cao, PHARM.DPharmacist1346369071
  25. Sean Cao, M.D.Surgery Physician1558360966
  26. Thanh Cao, D.O.Nephrology Physician1073963583
  27. Kerri Capodarco, FNP-BCNurse Practitioner1629847108
  28. Tiffany Caragan, NURSE PRACTITIONERFamily Nurse Practitioner1144597543
  29. Jonathan Rex Carlos, PTAPhysical Therapy Assistant1033815949
  30. Jody Carr, PA-CPhysician Assistant1881882264
  31. Jennifer CarranzaCommunity Health Worker1770262933
  32. Summer Carranza, BA CSD, CERT SLPASpeech-Language Assistant1245084854
  33. Paola CarrasquillaBehavior Technician1194443317
  34. Brenda CarrilloClinical Social Worker1366895237
  35. Danny CarrilloMental Health Counselor1740576693
  36. Alicia Carroll, SLPSpeech-Language Pathologist1104207679
  37. Dan Carver, O.D.Corneal and Contact Management Optometrist1083688675
  38. McKayla CasaliniPhysical Therapist1851263974
  39. Tina CasoliBehavior Technician1902528417
  40. Cathleen CassidySonography Radiologic Technologist1609194406
  41. David Cassidy, M.D.Diagnostic Radiology Physician1376591594
  42. Cathy Castagna-Petersen, MS,LMFTProfessional Counselor1871022277
  43. Christina CastanedaBehavior Technician1073224507
  44. Denise CastellanosMidwife1356587042
  45. Jaymee Castillo, PA-CPhysician Assistant1417429705
  46. Katelyn CastilloBehavior Technician1669952511
  47. Efren Castillo ArceMental Health Counselor1538637715
  48. Robert CastleAddiction (Substance Use Disorder) Counselor1821981945
  49. Mayerling CastroClinical Social Worker1295103794
  50. Monica CastroStudent in an Organized Health Care Education/Training Program1013742337

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

Fountain Valley, California appears in the CMS National Plan and Provider Enumeration System with 2,190 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 Fountain Valley - 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 Fountain Valley 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 Fountain Valley is weighted toward Behavior Technician (207 clinicians, followed by Pharmacist with 144 and Marriage & Family Therapist with 101). 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, Fountain Valley reports roughly 5.6 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, Addiction (Substance Use Disorder) Counselor is the most prominent one with no provider currently listing a Fountain Valley practice address, a coverage gap Fountain Valley patients typically fill by traveling to a larger nearby hub.

For Fountain Valley 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 Fountain Valley, CA?

There are 2,190 registered healthcare providers in Fountain Valley, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Fountain Valley?

The most common specialties in Fountain Valley are Behavior Technician, Pharmacist, Marriage & Family Therapist, Internal Medicine Physician, Other Technician. Behavior Technician has the most providers with 207.

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.