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 126 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. Arlene GuerreroBehavior Technician1598362832
  2. Bryan GuerreroBehavior Technician1407738602
  3. Daniel GuerreroBehavior Technician1386400844
  4. Dariel GuerreroBehavior Technician1619898863
  5. Dominique GuerreroBehavior Technician1962372060
  6. Elizabeth GuerreroBehavior Technician1598635492
  7. Evangelyna GuerreroBehavior Technician1871330373
  8. Joseph GuerreroBehavior Technician1417780529
  9. Kimberly GuerreroBehavior Technician1205547783
  10. Kimberly GuerreroBehavior Technician1134915101
  11. Miranda GuerreroBehavior Technician1255071031
  12. Nicole GuerreroBehavior Technician1013795103
  13. Yzabella GuerreroBehavior Technician1205724820
  14. Nayeli Guerrero RiveraBehavior Technician1528844404
  15. Kalyssa GuerrierBehavior Technician1275241143
  16. Michael GuessBehavior Technician1649142043
  17. Alexa GuevaraBehavior Technician1003678509
  18. Bethany GuevaraBehavior Technician1952110736
  19. Jessie GuevaraBehavior Technician1902620008
  20. Joseph GuevaraBehavior Technician1639966203
  21. Juliana GuevaraBehavior Technician1720726243
  22. Roberto GuevaraBehavior Technician1407670516
  23. Briana Guevara BenitezBehavior Technician1962181511
  24. Justin GueyeBehavior Technician1992530646
  25. Peter GugliuzzaBehavior Technician1598560088
  26. Pamela GuilbaultBehavior Technician1427880152
  27. Winecarde GuillaumeBehavior Technician1346075058
  28. Fatima GuillenBehavior Technician1598623753
  29. Josselin GuillenBehavior Technician1942920764
  30. Katherine GuillenBehavior Technician1164372454
  31. Marlene GuillenBehavior Technician1427781368
  32. Ruby GuillenBehavior Technician1073435244
  33. Victoria GuillenBehavior Technician1083457519
  34. Valeria Guillen-ArreolaBehavior Technician1992685937
  35. Diana Guillen-MemijeBehavior Technician1285382077
  36. Adam GuillermoBehavior Technician1780510230
  37. Madeleine GuilmetteBehavior Technician1790652063
  38. Nicole GuiltinanBehavior Technician1174251821
  39. Pamela GuinnBehavior Technician1154027126
  40. Tezia GuinnBehavior Technician1881409027
  41. Valeria GuiterrezBehavior Technician1316729015
  42. Emerson GuizarBehavior Technician1104557891
  43. Jessica GuizarBehavior Technician1699471664
  44. Stephanie GuizarBehavior Technician1801543525
  45. Kathleen GundersonBehavior Technician1851224661
  46. Shakira GunnBehavior Technician1588552822
  47. Shane GunnBehavior Technician1972282556
  48. Yarelis GunterBehavior Technician1366329286
  49. Shelley GupilanBehavior Technician1336782002
  50. Amanda Gurrola, MSSpeech-Language Pathologist1720649403

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.