NPPES file of Aug 9, 2026

Doctors and health care providers in Norwalk, CA

1,600 individual NPPES records list a practice address in Norwalk, 137th of 812 California cities. The largest group is behavior technician: 193, 12% of the city's records, against 18% across California. Page 22 of 32.

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

Norwalk in California

  • Rank in California137th of 812 cities by records
  • Share of the state0.2% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups24% of all records

Compared with California as a whole, Norwalk has 8.1× the state's share of licensed psychiatric technician records and 0.50× its share of addiction (substance use disorder) counselor records.

Providers in Norwalk, alphabetically

  1. Bruce Niels, LPTLicensed Psychiatric Technician1861857419
  2. David Niz, MDPsychiatry Physician1265488944
  3. Joan NjokuPsychiatric/Mental Health Nurse Practitioner1265140222
  4. Su Jin NoPharmacist1649876863
  5. Rebecca NoelPhysical Therapy Assistant1902264450
  6. Nicole NoggleClinical Social Worker1255205316
  7. Devoney NolbertoRegistered Nurse1851890966
  8. Roger Nomura, O.D.Optometrist1861564254
  9. Asmath Noor, D.D.S.M.DOrthodontics and Dentofacial Orthopedics Dentistry1770708646
  10. David NopCase Manager/Care Coordinator1801428461
  11. Nicholas NovellaMental Health Counselor1144429960
  12. Corinne Novick, LCSWSocial Worker1750696845
  13. Elizabeth O'DonnellMental Health Counselor1154088359
  14. Jessica ObandoStudent in an Organized Health Care Education/Training Program1609317163
  15. Chukwuemeka Obilor, LVNLicensed Vocational Nurse1447404157
  16. Samantha OcampoBehavior Technician1073467007
  17. Uche OchiaPsychiatric/Mental Health Nurse Practitioner1831915065
  18. Eduardo Ochoa, BCBABehavior Analyst1821744475
  19. Jessica OchoaStudent in an Organized Health Care Education/Training Program1104396159
  20. Lisa Oda, RN, MSN, CPNPPediatric Nurse Practitioner1154652543
  21. Jennifer Oday, M.D.Psychiatry Physician1760545693
  22. Greta Oducayen, LCSWClinical Social Worker1619051984
  23. Jenny Oh, DDSGeneral Practice Dentistry1881808095
  24. Jan Marie Ojacastro, NURSE PRACTITIONERFamily Nurse Practitioner1336915693
  25. Chioma Okaro, PMHNPPsychiatric/Mental Health Nurse Practitioner1487450003
  26. Ifeyinwa OkekePharmacist1811279979
  27. Kenechi OkoliCase Manager/Care Coordinator1518515485
  28. Yvonne Olive, N.P.Family Nurse Practitioner1952562639
  29. Rene OlmosCognitive & Behavioral Psychologist1821818444
  30. Saja OmarBehavior Technician1801752498
  31. Yanique OnealCase Manager/Care Coordinator1215580550
  32. Irene OntiverosStudent in an Organized Health Care Education/Training Program1831704642
  33. Chikaodinaka Onyebalu, PMHNPPsychiatric/Mental Health Nurse Practitioner1033901608
  34. Marcelinus Onyejiji, NPPsychiatric/Mental Health Nurse Practitioner1467287714
  35. Annamma Oommen, RNRegistered Nurse1972672343
  36. Sara OrdunaBehavior Technician1770293391
  37. Andrew Oreta, PT, DPTPhysical Therapist1538860887
  38. Erica OrnelasStudent in an Organized Health Care Education/Training Program1922662170
  39. Edgar OrozcoBehavior Technician1497613335
  40. Cristian Orozco-GarciaStudent in an Organized Health Care Education/Training Program1710845599
  41. Joanna Ortiz MartinezBehavior Technician1922969021
  42. Lori Oshiro, LCSWClinical Social Worker1124899380
  43. Ralph Allan Osorio, RN, MSN, NP-CFamily Nurse Practitioner1578101531
  44. Sergio OsorioCase Manager/Care Coordinator1235740713
  45. Karla OsunaDoula1881556744
  46. Kent OyaStudent in an Organized Health Care Education/Training Program1932656352
  47. Tulin Ozkaragoz, PH.DClinical Psychologist1932156973
  48. Teresita Pabalan, DMDDentist1629176102
  49. Monica PachecoStudent in an Organized Health Care Education/Training Program1689500837
  50. Stephanie PadillaOccupational Therapy Assistant1811830649

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

Norwalk, California appears in the CMS National Plan and Provider Enumeration System with 1,600 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 Norwalk - 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 Norwalk 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 Norwalk is weighted toward Behavior Technician (193 clinicians, followed by Case Manager/Care Coordinator with 105 and Student in an Organized Health Care Education/Training Program with 86). 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, Norwalk reports roughly 4.1 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, Behavior Analyst is the most prominent one with no provider currently listing a Norwalk practice address, a coverage gap Norwalk patients typically fill by traveling to a larger nearby hub.

For Norwalk 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 Norwalk, CA?

There are 1,600 registered healthcare providers in Norwalk, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Norwalk?

The most common specialties in Norwalk are Behavior Technician, Case Manager/Care Coordinator, Student in an Organized Health Care Education/Training Program, Clinical Social Worker, Marriage & Family Therapist. Behavior Technician has the most providers with 193.

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.