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.
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
- Ryan Nguyen, PHARMDPharmacist1104465038
- Sarah NguyenMarriage & Family Therapist1427515527
- Theresa Nguyen, DOChild & Adolescent Psychiatry Physician1679884928
- Thien Trang Nguyen, DDSGeneral Practice Dentistry1417055864
- Thu NguyenNurse Practitioner1902229578
- Tiffany Nguyen, DDSDentist1356061287
- Todd Nguyen, NPNurse Practitioner1063270015
- Tony NguyenMarriage & Family Therapist1588979504
- Trini Nguyen, BABehavior Technician1376000760
- Victoria Nguyen, DDSGeneral Practice Dentistry1104955111
- Vivie Jen NguyenBehavior Technician1891508941
- Madonna Nicolai, CFNPInternal Medicine Physician1164648556
- Vivianna Nieto-Foust, LMFTMarriage & Family Therapist1265850028
- Michael NishimotoStudent in an Organized Health Care Education/Training Program1225974496
- Michael NishimuraOccupational Therapist1528999117
- Nicole Noche, NPWomen's Health Nurse Practitioner1003400524
- Ma Genevive Nolasco, M.A., BCBABehavior Analyst1649622655
- Charlotte NordstromFamily Nurse Practitioner1558807107
- Courtnee Novales, RNRegistered Nurse1306613914
- Shane NunanBehavior Technician1275113367
- Gustavo NunezBehavior Analyst1548194145
- Sylvia Nunez Serrano, LMFTMarriage & Family Therapist1366858284
- Lorraine Nunez-Santana, BIAthletic Trainer1073310470
- Alexandria O BardBehavior Technician1336606516
- Michele O'Hara, PTPhysical Therapist1720261654
- Rafael Ochoa, RDHDental Hygienist1063865509
- Jason Ockey, COTA/LOccupational Therapy Assistant1215348651
- Trevor Odell, DPTPhysical Therapist1184489494
- Sanae Ogura, MDFamily Medicine Physician1366192502
- Charles Oh, M.D.Specialist1780689042
- Don Oh, M.D.Internal Medicine Physician1326247669
- Vahan Oknayan, MFTMarriage & Family Therapist1639949746
- Skyler OlisBehavior Technician1386480291
- Lauren OlivasBehavior Technician1780371179
- Michelle Ollada Alipio, RNRegistered Nurse1861274094
- Bryan OlmedoRehabilitation Practitioner1326837147
- Nancy OlsenOccupational Therapist1902266588
- Clark OlsonRehabilitation Practitioner1043001282
- Kailee OlsonOther Technician1477816833
- Sarah Onaga, ODOptometrist1710417522
- Cathy Ong, O.D.Optometrist1801123518
- Kayla OrateNurse Practitioner1457234783
- Theadora Ordog, MDPediatrics Physician1508515164
- Joan OrdonezSpeech-Language Pathologist1548679475
- Amelia Orduna-Coe, DDSDentist1205291986
- Lee Ann OrmeMarriage & Family Therapist1720325178
- Belinda Orozco, RNRegistered Nurse1285334557
- Joanne Ortega, M.S., CCC-SLPSpeech-Language Pathologist1003933060
- Gisell OrtegonRehabilitation Practitioner1619766151
- Gladys OrtizBehavior Technician1851228282
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
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.