NPPES file of Aug 9, 2026

Doctors and health care providers in Santa Ana, CA

8,904 individual NPPES records list a practice address in Santa Ana, 18th of 812 California cities. The largest group is behavior technician: 1,625, 18% of the city's records, against 18% across California. Page 39 of 179.

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

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

The 8 largest groups in Santa Ana

  1. Behavior Technician1,625
  2. Mental Health Counselor684
  3. Marriage & Family Therapist678
  4. Clinical Social Worker433
  5. Addiction (Substance Use Disorder) Counselor407
  6. Registered Nurse281
  7. Counselor247
  8. Social Worker216

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

Santa Ana in California

  • Rank in California18th of 812 cities by records
  • Share of the state0.9% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups33.5% of all records

Compared with California as a whole, Santa Ana has 12.5× the state's share of community health registered nurse records and 0.50× its share of student in an organized health care education/training program records.

Providers in Santa Ana, alphabetically

  1. Ashley DiabBehavior Technician1649128307
  2. Lian DialBehavior Technician1548046147
  3. Tuyen Diamantopoulos, PHARMDPharmacist1245508225
  4. Amanda DiamondBehavior Technician1841056777
  5. Brianna Diamond, BA, RADTAddiction (Substance Use Disorder) Counselor1306608930
  6. Alejandro DiazPsychologist1821610650
  7. Alexis DiazMental Health Counselor1609427277
  8. Andrea DiazMental Health Counselor1912477142
  9. Anthony DiazMental Health Counselor1639595077
  10. Brittany DiazCounselor1649916362
  11. Claudia Diaz, MAMarriage & Family Therapist1780448480
  12. Cristie DiazCounselor1801019377
  13. Elizabeth DiazCounselor1366206633
  14. Elizabeth DiazPeer Specialist1326880519
  15. Geraldine DiazBehavior Technician1598592131
  16. Ivette DiazBehavior Technician1548960214
  17. Jessica DiazPharmacist1336865138
  18. Jonathan DiazBehavior Technician1346092285
  19. Leticia DiazMarriage & Family Therapist1326472309
  20. Maidellin Diaz, RNRegistered Nurse1184481210
  21. Mariah DiazCommunity Health Worker1376285221
  22. Michelle DiazCounselor1427201763
  23. Monica Diaz, RDADental Assistant1326308529
  24. Natalie DiazDay Training/Habilitation Specialist1154139210
  25. Pamela DiazRehabilitation Practitioner1275408106
  26. Rosa DiazMarriage & Family Therapist1639633571
  27. Seima Diaz, MACPMarriage & Family Therapist1245568849
  28. Sergio DiazMassage Therapist1063829919
  29. Stephanie DiazMental Health Counselor1396093696
  30. Ximena DiazBehavior Technician1396305488
  31. Yanete DiazClinical Social Worker1023750148
  32. Maruja Diaz Arjonilla, MDEndocrinology, Diabetes & Metabolism Physician1841481074
  33. Ashley Diaz DeleonMental Health Counselor1881299634
  34. Britni Diaz DeleonBehavior Technician1407694524
  35. Marisela Diaz Leon De RamirezCommunity Health Worker1922844216
  36. Rosemary Diaz RuizOther Technician1669081824
  37. Maria Diaz-GuevaraDay Training/Habilitation Specialist1689984361
  38. Susan DickersonSpeech-Language Pathologist1235070152
  39. Linda DickeySocial Worker1487976338
  40. Agnes Dickson, PSYCHOLOGISTClinical Psychologist1861565772
  41. Dolores DicksonMental Health Counselor1639566300
  42. Sharon Dickson, MSW.,LCSWClinical Social Worker1629313796
  43. Rebecca Didonato, AABehavior Technician1013672989
  44. Isabel DiegoBehavior Technician1033700547
  45. Denise Diep, BEHAVIOR TECHNICIANBehavior Technician1215515739
  46. Duyen DiepBehavior Technician1801405949
  47. Peter Diep, BEHAVIOR TECHNICIANBehavior Technician1497300842
  48. Vinnie Diep, RBTOther Technician1952769382
  49. Nicole DietrichPsychologist1619709466
  50. Alisa Dietz, M.A., B.C.B.A.Behavior Analyst1326401928

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

Santa Ana, California appears in the CMS National Plan and Provider Enumeration System with 8,904 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 Santa Ana - 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 Santa Ana 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 Santa Ana is weighted toward Behavior Technician (1,625 clinicians, followed by Mental Health Counselor with 684 and Marriage & Family Therapist with 678). 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, Santa Ana reports roughly 22.9 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, Internal Medicine Physician is the most prominent one with no provider currently listing a Santa Ana practice address, a coverage gap Santa Ana patients typically fill by traveling to a larger nearby hub.

For Santa Ana 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 Santa Ana, CA?

There are 8,904 registered healthcare providers in Santa Ana, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Santa Ana?

The most common specialties in Santa Ana are Behavior Technician, Mental Health Counselor, Marriage & Family Therapist, Clinical Social Worker, Addiction (Substance Use Disorder) Counselor. Behavior Technician has the most providers with 1,625.

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.