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 54 of 347.
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
- Kenia CastilloBehavior Technician1528919503
- Lesley CastilloBehavior Technician1689381410
- Luna CastilloBehavior Technician1124842232
- Maria CastilloBehavior Technician1407739451
- Richard CastilloBehavior Technician1174445563
- Ruby CastilloBehavior Technician1407534167
- Teresa CastilloBehavior Technician1063269918
- Thomas CastilloBehavior Technician1790537637
- Whitney CastilloBehavior Technician1144039017
- Wilfredo CastilloBehavior Technician1336827534
- Zunhaila CastilloBehavior Technician1538927033
- Jose Castillo De SerinBehavior Analyst1992338685
- Leyla Castillo GalvezBehavior Technician1306626742
- Blanca Estrella Castillo GuzmanBehavior Technician1134807399
- Ciara Lyn Castillo-GonzalezBehavior Technician1821732140
- Mariana CastleBehavior Technician1437916202
- Adrienna CastoroBehavior Technician1194558197
- Alexis CastroBehavior Technician1659123594
- Alyssa CastroBehavior Technician1568118560
- Amber Castro, MAMarriage & Family Therapist1194384412
- Andrea CastroBehavior Technician1295424448
- Arthur CastroBehavior Technician1497587216
- Berenice CastroBehavior Technician1083453088
- Brenda CastroBehavior Technician1801784418
- Brian CastroBehavior Technician1922929884
- Clarisa CastroBehavior Technician1053115311
- Elizabeth CastroBehavior Technician1598608606
- Jasmine CastroBehavior Technician1518840560
- Jasmine CastroBehavior Technician1013865971
- Jessica CastroBehavior Technician1508587510
- Leslie CastroBehavior Technician1356063713
- Litzy CastroBehavior Technician1508780925
- Marissa CastroBehavior Technician1811724966
- Maya CastroBehavior Technician1427745587
- Priscila CastroBehavior Technician1699502294
- Richard CastroBehavior Technician1861313801
- Samantha CastroBehavior Technician1053123224
- Saray CastroBehavior Technician1073238937
- Shania CastroBehavior Technician1023865599
- Mia Castro McGeeBehavior Technician1962340869
- Elsa Castro-GarciaBehavior Technician1689491292
- Faithallianne CatacutanBehavior Technician1013838978
- Ashley CatanoBehavior Technician1336727437
- Theresa CatheyBehavior Technician1477444065
- Christine CaudilloBehavior Technician1811730534
- Megan CaudilloOccupational Therapy Assistant1376259192
- Alexis CavadaBehavior Technician1033969464
- Katelyn CavalieriBehavior Technician1982318143
- Brianna CavanaghBehavior Technician1437974292
- Ivonne Cavanaugh ReyesBehavior Technician1447085196
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
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.