NPPES file of Aug 9, 2026

Doctors and health care providers in Monrovia, CA

17,347 individual NPPES records list a practice address in Monrovia, 8th of 812 California cities. The largest group is behavior technician: 16,526, 95% of the city's records, against 18% across California. Page 53 of 347.

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

The 8 largest groups in Monrovia

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

Monrovia in California

  • Rank in California8th of 812 cities by records
  • Share of the state1.8% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups96.4% of all records
  • Behavior Technician rank1st of the 10 California cities with the most

Compared with California as a whole, Monrovia has 5.4× the state's share of behavior technician records and 0.09× its share of marriage & family therapist records.

Providers in Monrovia, alphabetically

  1. Robert CasillasBehavior Technician1811767635
  2. Sandra CasillasBehavior Technician1497684849
  3. Brittany CasperBehavior Technician1619683521
  4. Shannon CassBehavior Technician1548032642
  5. Mary CassadayBehavior Technician1811779523
  6. Eduardo CasselynBehavior Technician1942128301
  7. Faidherme CasseusBehavior Technician1427937713
  8. Salena CassianoBehavior Technician1467157776
  9. Mark CassioBehavior Technician1598515926
  10. Aaryn CastanedaBehavior Technician1346964814
  11. Alexis CastanedaBehavior Technician1801521976
  12. Blanca CastanedaDay Training/Habilitation Specialist1548956949
  13. Briana CastanedaLicensed Vocational Nurse1497601637
  14. Daisy CastanedaBehavior Technician1578413597
  15. Jose CastanedaBehavior Technician1366313108
  16. Kimberly CastanedaBehavior Technician1063293629
  17. Nathalie CastanedaBehavior Technician1710564042
  18. Trinity CastanedaBehavior Technician1013669035
  19. Vanesa CastanedaBehavior Technician1033069059
  20. Naydelin Castaneda CenicerosBehavior Technician1619609443
  21. Gabriela Castaneda CovarrubiasBehavior Technician1598641607
  22. Emily Castaneda ReyesBehavior Technician1942983879
  23. Ana CastanonBehavior Technician1104747062
  24. Dominic CastanonBehavior Technician1316678147
  25. Jacqueline CastanonBehavior Technician1144148727
  26. Jeovany CastellanoBehavior Technician1447937644
  27. Kevin CastellanoBehavior Technician1699658641
  28. Angel CastellanosBehavior Technician1124946587
  29. Hilda CastellanosBehavior Technician1437007382
  30. Isabella CastellanosBehavior Technician1043922750
  31. Jahnean CastellanosBehavior Technician1447083571
  32. Jessica CastellanosBehavior Technician1558087890
  33. Yesenia CastellanosBehavior Technician1477302297
  34. Danielle CastelloBehavior Technician1427794114
  35. Alissa CastellonBehavior Technician1356153175
  36. Andrea CastellonBehavior Technician1568040665
  37. James CastellonBehavior Technician1811880610
  38. Kimberly CastellonBehavior Technician1558045716
  39. Omar CastellonBehavior Technician1578297701
  40. Aileen CastilloBehavior Technician1851013387
  41. Allison CastilloBehavior Technician1750208567
  42. Amanda CastilloBehavior Technician1962253682
  43. Anaester CastilloBehavior Technician1801533047
  44. Carlos CastilloBehavior Technician1194470328
  45. Christina CastilloBehavior Technician1477236461
  46. Diana CastilloBehavior Technician1073368080
  47. Estephania CastilloBehavior Technician1518798909
  48. Iris CastilloBehavior Technician1124878558
  49. Jennifer CastilloBehavior Technician1134043961
  50. Karla CastilloBehavior Technician1811684970

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

Monrovia, California appears in the CMS National Plan and Provider Enumeration System with 17,347 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 Monrovia - 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 Monrovia 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 Monrovia is weighted toward Behavior Technician (16,526 clinicians, followed by Behavior Analyst with 109 and Marriage & Family Therapist with 94). 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, Monrovia reports roughly 44.5 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, Addiction (Substance Use Disorder) Counselor is the most prominent one with no provider currently listing a Monrovia practice address, a coverage gap Monrovia patients typically fill by traveling to a larger nearby hub.

For Monrovia 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 Monrovia, CA?

There are 17,347 registered healthcare providers in Monrovia, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Monrovia?

The most common specialties in Monrovia are Behavior Technician, Behavior Analyst, Marriage & Family Therapist, Speech-Language Pathologist, Student in an Organized Health Care Education/Training Program. Behavior Technician has the most providers with 16,526.

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.