NPPES file of Aug 9, 2026

Doctors and health care providers in Whittier, CA

2,836 individual NPPES records list a practice address in Whittier, 80th of 812 California cities. The largest group is behavior technician: 272, 10% of the city's records, against 18% across California. Page 38 of 57.

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

The 8 largest groups in Whittier

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

Whittier in California

  • Rank in California80th of 812 cities by records
  • Share of the state0.3% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups19.8% of all records

Compared with California as a whole, Whittier has 19.1× the state's share of speech-language assistant records and 0.50× its share of mental health counselor records.

Providers in Whittier, alphabetically

  1. Ashley NunoSpeech-Language Assistant1003396524
  2. Brooke NyenhuisSpeech-Language Assistant1154799914
  3. Aidan O'Brien, MDAnesthesiology Physician1417917691
  4. Dorothy O'BrienCommunity Health Registered Nurse1780042861
  5. Brittany O'ConnorOccupational Therapist1275931933
  6. Paul O'Connor, M.D.Diagnostic Radiology Physician1740629559
  7. Kerrie O'Leary-Sanchez, PSYDPsychologist1669993309
  8. Cristina O'Reilly, CCC SLPSpeech-Language Pathologist1154031417
  9. Christine Oak, OTROccupational Therapist1275192981
  10. Sy Oang, D.O.Internal Medicine Physician1972692937
  11. Thalia OberlyMarriage & Family Therapist1598105173
  12. Payal Ocampo, PA-CPhysician Assistant1700218427
  13. Tracy Ocampo, FNP-CFamily Nurse Practitioner1649704115
  14. Maria Ochoa, RNCommunity Health Registered Nurse1205292091
  15. Susana Ochoa-Valle, LCSWClinical Social Worker1558559351
  16. Nicole OchotorenaAddiction (Substance Use Disorder) Counselor1497564611
  17. Marcia Oen, PA-C, MPHSurgical Physician Assistant1174098727
  18. Michael Oest, CPOSpecialist1992996581
  19. Zachary Offman, DMDDentist1932736972
  20. Cee OgbeMarriage & Family Therapist1528307345
  21. Gordon Oh, PHARM.D.Pharmacist1982259362
  22. Lauren Okamura, RDRegistered Dietitian1457548554
  23. Gale OkeefeAcupuncturist1437334679
  24. Ekwy OkekeFamily Nurse Practitioner1609416643
  25. Marizol OkoliOccupational Therapist1235871005
  26. Emi OkunoBehavior Technician1043929276
  27. Lindsey OkunoBehavior Analyst1689596462
  28. Rosemary Oliva-Ponce, MSWSocial Worker1720375579
  29. Yvette OlivarriAddiction (Substance Use Disorder) Counselor1174983043
  30. Karla OliverCase Manager/Care Coordinator1194069104
  31. Janine OlmosMarriage & Family Therapist1184219388
  32. Tay OmOccupational Therapist1629575915
  33. Xavier Ordonez, O.D.Optometrist1750488193
  34. Alexis OrellanaBehavior Technician1265921654
  35. Cindy OrellanaAssistant Behavior Analyst1538051370
  36. Angelie Ornopia, M.A.Occupational Therapist1023447661
  37. Danielle OropezaBehavior Technician1033918396
  38. Corinne Orozco, SLPASpeech-Language Assistant1851736599
  39. Cristina OrozcoMarriage & Family Therapist1679216568
  40. Jorge OrozcoPhysical Therapist1891599361
  41. Elisa OrtaOccupational Therapy Assistant1861802597
  42. Kim Ortega, AU.D.Audiologist1831369552
  43. Carmen OrtizSpeech-Language Pathologist1326475922
  44. Carrie Ortiz, M.A., CCC-SLPSpeech-Language Pathologist1518191154
  45. Guadalupe OrtizMassage Therapist1033912241
  46. Lupie OrtizSpeech-Language Assistant1720531312
  47. Bernadette Osburn, MSN, RN, CNSGerontology Clinical Nurse Specialist1811823099
  48. Veronica OsegueraCase Manager/Care Coordinator1821384140
  49. Marwa Osman-Ahmed, SLP-CCCSpeech-Language Pathologist1407370950
  50. Andrew Ossa, RDNRegistered Dietitian1952860595

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

Whittier, California appears in the CMS National Plan and Provider Enumeration System with 2,836 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 Whittier - 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 Whittier 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 Whittier is weighted toward Behavior Technician (272 clinicians, followed by Clinical Social Worker with 149 and Speech-Language Assistant with 141). 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, Whittier reports roughly 7.3 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, Case Manager/Care Coordinator is the most prominent one with no provider currently listing a Whittier practice address, a coverage gap Whittier patients typically fill by traveling to a larger nearby hub.

For Whittier 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 Whittier, CA?

There are 2,836 registered healthcare providers in Whittier, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Whittier?

The most common specialties in Whittier are Behavior Technician, Clinical Social Worker, Speech-Language Assistant, Marriage & Family Therapist, Pharmacist. Behavior Technician has the most providers with 272.

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.