NPPES file of Aug 9, 2026

Doctors and health care providers in Downey, CA

3,607 individual NPPES records list a practice address in Downey, 60th of 812 California cities. The largest group is behavior technician: 763, 21% of the city's records, against 18% across California. Page 42 of 73.

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

Downey in California

  • Rank in California60th of 812 cities by records
  • Share of the state0.4% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups32.4% of all records

Compared with California as a whole, Downey has 9.5× the state's share of ambulatory care registered nurse records and 0.38× its share of marriage & family therapist records.

Providers in Downey, alphabetically

  1. Perla MarinBehavior Technician1033784822
  2. Arnold Mariscal, D.C.Chiropractor1174522593
  3. Brianna MarquezBehavior Technician1235608332
  4. Joseph Marquez, D.O.Child & Adolescent Psychiatry Physician1902989528
  5. Nicholas MarquezBehavior Technician1366065948
  6. Phillip Marquez, RCP, RRTRegistered Respiratory Therapist1629830559
  7. Vicky Marquez, AGACNP-BCAcute Care Nurse Practitioner1982460424
  8. Maricarmen Marquez MendozaDay Training/Habilitation Specialist1972271948
  9. Ashley MarroquinBehavior Technician1073376943
  10. Gary Marsh, M.D.Cardiovascular Disease Physician1639116296
  11. Wayne MarshallBehavior Technician1407473804
  12. Lauren MartinCounselor1689493777
  13. Maria Martin, PTPhysical Therapist1386937290
  14. Alejandra MartinezBehavior Technician1669062485
  15. Ariana MartinezBehavior Technician1245107747
  16. Ashley MartinezBehavior Technician1104412048
  17. Berlin MartinezBehavior Technician1588133615
  18. Caitlin MartinezBehavior Technician1215582002
  19. Carlos MartinezClinical Social Worker1316595879
  20. Geovanny MartinezBehavior Technician1376132779
  21. Gerardo MartinezPhysical Therapy Assistant1326562638
  22. Giselle MartinezSpeech-Language Assistant1780484279
  23. Heidi MartinezBehavior Technician1184551483
  24. Jaimie Martinez, LCSWClinical Social Worker1528733797
  25. Jamie MartinezBehavior Technician1598436487
  26. Jazmin MartinezHealth & Wellness Coach1245191295
  27. Joe MartinezAddiction (Substance Use Disorder) Counselor1649639543
  28. Jon Martinez, MSWClinical Social Worker1811753882
  29. Lizet Martinez, MSWSocial Worker1679043483
  30. Marco MartinezBehavior Technician1235608407
  31. Marleen MartinezBehavior Technician1003574377
  32. Melanie MartinezBehavior Technician1396414074
  33. Melida MartinezBehavior Technician1790384923
  34. Michelle Martinez, LCSWClinical Social Worker1356954101
  35. Mindy MartinezAssistant Behavior Analyst1033783758
  36. Natalie MartinezCommunity Health Worker1780472266
  37. Rossy Martinez, DDSDentist1699894642
  38. Samantha MartinezBehavior Technician1821633264
  39. Sarah MartinezBehavior Technician1407425564
  40. Susan MartinezBehavior Technician1497387138
  41. Zoila Martinez, DDSGeneral Practice Dentistry1700907243
  42. Maritza Martinez HernandezBehavior Technician1548933872
  43. Viviana Martinez ReynagaBehavior Technician1407431091
  44. Mirna Martinez Serrano, LCSWClinical Social Worker1114104338
  45. Estefania Martinez- AlburezMarriage & Family Therapist1215621875
  46. Marsha Martinson, M.D.Obstetrics & Gynecology Physician1043525157
  47. Masina MasinaAddiction (Substance Use Disorder) Counselor1275154379
  48. Monica MasonSpeech-Language Pathologist1790240562
  49. T'Keya MasonBehavior Technician1770052946
  50. Nilcri Massey, RCP-RRTNeonatal/Pediatric Registered Respiratory Therapist1770341604

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

Downey, California appears in the CMS National Plan and Provider Enumeration System with 3,607 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 Downey - 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 Downey 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 Downey is weighted toward Behavior Technician (763 clinicians, followed by Pharmacist with 248 and Physical Therapist with 159). 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, Downey reports roughly 9.3 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, Mental Health Counselor is the most prominent one with no provider currently listing a Downey practice address, a coverage gap Downey patients typically fill by traveling to a larger nearby hub.

For Downey 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 Downey, CA?

There are 3,607 registered healthcare providers in Downey, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Downey?

The most common specialties in Downey are Behavior Technician, Pharmacist, Physical Therapist, Addiction (Substance Use Disorder) Counselor, Clinical Social Worker. Behavior Technician has the most providers with 763.

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.