NPPES file of Aug 9, 2026

Doctors and health care providers in Tustin, CA

2,221 individual NPPES records list a practice address in Tustin, 97th of 812 California cities. The largest group is marriage & family therapist: 276, 12% of the city's records, against 6% across California. Page 30 of 45.

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

The 8 largest groups in Tustin

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

Tustin in California

  • Rank in California97th of 812 cities by records
  • Share of the state0.2% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups29.5% of all records

Compared with California as a whole, Tustin has 3.4× the state's share of chiropractor records and 0.70× its share of behavior technician records.

Providers in Tustin, alphabetically

  1. Ryan Nguyen, PHARMDPharmacist1104465038
  2. Sarah NguyenMarriage & Family Therapist1427515527
  3. Theresa Nguyen, DOChild & Adolescent Psychiatry Physician1679884928
  4. Thien Trang Nguyen, DDSGeneral Practice Dentistry1417055864
  5. Thu NguyenNurse Practitioner1902229578
  6. Tiffany Nguyen, DDSDentist1356061287
  7. Todd Nguyen, NPNurse Practitioner1063270015
  8. Tony NguyenMarriage & Family Therapist1588979504
  9. Trini Nguyen, BABehavior Technician1376000760
  10. Victoria Nguyen, DDSGeneral Practice Dentistry1104955111
  11. Vivie Jen NguyenBehavior Technician1891508941
  12. Madonna Nicolai, CFNPInternal Medicine Physician1164648556
  13. Vivianna Nieto-Foust, LMFTMarriage & Family Therapist1265850028
  14. Michael NishimotoStudent in an Organized Health Care Education/Training Program1225974496
  15. Michael NishimuraOccupational Therapist1528999117
  16. Nicole Noche, NPWomen's Health Nurse Practitioner1003400524
  17. Ma Genevive Nolasco, M.A., BCBABehavior Analyst1649622655
  18. Charlotte NordstromFamily Nurse Practitioner1558807107
  19. Courtnee Novales, RNRegistered Nurse1306613914
  20. Shane NunanBehavior Technician1275113367
  21. Gustavo NunezBehavior Analyst1548194145
  22. Sylvia Nunez Serrano, LMFTMarriage & Family Therapist1366858284
  23. Lorraine Nunez-Santana, BIAthletic Trainer1073310470
  24. Alexandria O BardBehavior Technician1336606516
  25. Michele O'Hara, PTPhysical Therapist1720261654
  26. Rafael Ochoa, RDHDental Hygienist1063865509
  27. Jason Ockey, COTA/LOccupational Therapy Assistant1215348651
  28. Trevor Odell, DPTPhysical Therapist1184489494
  29. Sanae Ogura, MDFamily Medicine Physician1366192502
  30. Charles Oh, M.D.Specialist1780689042
  31. Don Oh, M.D.Internal Medicine Physician1326247669
  32. Vahan Oknayan, MFTMarriage & Family Therapist1639949746
  33. Skyler OlisBehavior Technician1386480291
  34. Lauren OlivasBehavior Technician1780371179
  35. Michelle Ollada Alipio, RNRegistered Nurse1861274094
  36. Bryan OlmedoRehabilitation Practitioner1326837147
  37. Nancy OlsenOccupational Therapist1902266588
  38. Clark OlsonRehabilitation Practitioner1043001282
  39. Kailee OlsonOther Technician1477816833
  40. Sarah Onaga, ODOptometrist1710417522
  41. Cathy Ong, O.D.Optometrist1801123518
  42. Kayla OrateNurse Practitioner1457234783
  43. Theadora Ordog, MDPediatrics Physician1508515164
  44. Joan OrdonezSpeech-Language Pathologist1548679475
  45. Amelia Orduna-Coe, DDSDentist1205291986
  46. Lee Ann OrmeMarriage & Family Therapist1720325178
  47. Belinda Orozco, RNRegistered Nurse1285334557
  48. Joanne Ortega, M.S., CCC-SLPSpeech-Language Pathologist1003933060
  49. Gisell OrtegonRehabilitation Practitioner1619766151
  50. Gladys OrtizBehavior Technician1851228282

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

Tustin, California appears in the CMS National Plan and Provider Enumeration System with 2,221 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 Tustin - 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 Tustin 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 Tustin is weighted toward Marriage & Family Therapist (276 clinicians, followed by Behavior Technician with 273 and Clinical Social Worker with 106). 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, Tustin reports roughly 5.7 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 Tustin practice address, a coverage gap Tustin patients typically fill by traveling to a larger nearby hub.

For Tustin 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 Tustin, CA?

There are 2,221 registered healthcare providers in Tustin, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Tustin?

The most common specialties in Tustin are Marriage & Family Therapist, Behavior Technician, Clinical Social Worker, General Practice Dentistry, Chiropractor. Marriage & Family Therapist has the most providers with 276.

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.