2026 data CMS NPPES NUCC Taxonomy

Doctors in Monrovia, CA

Compiled from official public sources by the PlainDoctor editorial team.

Active healthcare providers in Monrovia sourced from the CMS NPPES weekly file, no proprietary ratings, no editorial scores. NPI counts, specialty distribution, and primary practice addresses refreshed each release.

15,779
Providers
CMS NPPES-registered
20
Specialties
NUCC taxonomy codes
Behavior Technician
Top specialty
14,977 providers
California
State
CA

15,779 healthcare providers across 20 specialties

Monrovia, California appears in the CMS National Plan and Provider Enumeration System with 15,779 registered healthcare providers spanning 20 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 2023 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 (14,977 clinicians, followed by Behavior Analyst with 116 and Marriage & Family Therapist with 81). 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 40.5 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.

Within California, Monrovia ranks #8 of 805 cities tracked by provider count, accounting for 1.7% of the state's registered providers. 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, searching by specialty narrows the 690-taxonomy roster to clinicians with the relevant training, and each provider page links to NPI, state licensing boards, and the NPPES registry for credential verification. 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, so listing details may be out of date; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients. Nothing on this page substitutes for consulting a licensed clinician about your personal health decisions.

15,779
Providers
20
Specialties
#8
of 805 CA cities
1.7%
of CA providers
40.5
Per 100K (state)

Which specialties are most common in Monrovia

Behavior Technician 14,977
Behavior Analyst 116
Marriage & Family Therapist 81
Speech-Language Pathologist 48
Mental Health Counselor 39
Student in an Organized Health Care Education/Training Program 37
Pharmacist 33
Genetic Counselor (M.S.) 28
Rehabilitation Practitioner 24
Case Manager/Care Coordinator 21
Clinical Social Worker 21
Physical Therapist 16
Optometrist 16
Pediatric Occupational Therapist 15
Assistant Behavior Analyst 14
Speech-Language Assistant 13
Licensed Vocational Nurse 12
General Practice Dentistry 11
Dentist 11
Licensed Psychiatric Technician 10

Healthcare Providers (Page 49)

Name
Estephania Castillo
Behavior Technician
Iris Castillo
Behavior Technician
Karla Castillo
Behavior Technician
Kenia Castillo
Behavior Technician
Lesley Castillo
Behavior Technician
Luna Castillo
Behavior Technician
Maria Castillo
Behavior Technician
Ruby Castillo
Behavior Technician
Teresa Castillo
Behavior Technician
Thomas Castillo
Behavior Technician
Whitney Castillo
Behavior Technician
Wilfredo Castillo
Behavior Technician
Zunhaila Castillo
Behavior Technician
Jose Castillo De Serin
Behavior Analyst
Leyla Castillo Galvez
Behavior Technician
Blanca Estrella Castillo Guzman
Behavior Technician
Ciara Lyn Castillo-Gonzalez
Behavior Technician
Mariana Castle
Behavior Technician
Adrienna Castoro
Behavior Technician
Alexis Castro
Behavior Technician
Alyssa Castro
Behavior Technician
Amber Castro, MA
Mental Health Counselor
Andrea Castro
Behavior Technician
Arthur Castro
Behavior Technician
Berenice Castro
Behavior Technician
Brenda Castro
Behavior Technician
Clarisa Castro
Behavior Technician
Jasmine Castro
Behavior Technician
Javier Castro
Behavior Technician
Jessica Castro
Behavior Technician
Leslie Castro
Behavior Technician
Marissa Castro
Behavior Technician
Maya Castro
Behavior Technician
Priscila Castro
Behavior Technician
Samantha Castro
Behavior Technician
Saray Castro
Behavior Technician
Shania Castro
Behavior Technician
Elsa Castro-Garcia
Behavior Technician
Ashley Catano
Behavior Technician
Theresa Cathey
Behavior Technician
Christine Caudillo
Behavior Technician
Megan Caudillo
Occupational Therapy Assistant
Alexis Cavada
Behavior Technician
Katelyn Cavalieri
Behavior Technician
Brianna Cavanagh
Behavior Technician
Ivonne Cavanaugh Reyes
Behavior Technician
Audira Cave
Behavior Technician
Audrianna Cave
Behavior Technician
Mia Cave
Behavior Technician
Bailey Caviness
Behavior Technician

Nearby Cities in California

Other California cities with provider coverage in the CMS NPPES registry.

Compare specialties side-by-side →

Frequently Asked Questions

How many doctors are in Monrovia, CA?
There are 15,779 registered healthcare providers in Monrovia, CA, covering 20 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, Mental Health Counselor. Behavior Technician has the most providers with 14,977.

Provider data from CMS NPPES (download.cms.gov/nppes); specialty classification from NUCC Health Care Provider Taxonomy. PlainDoctor does not rate or rank providers. Methodology · About

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from CMS National Plan and Provider Enumeration System (NPPES). Consult a qualified professional before making decisions based on this data.

Compiled from official public sources by the PlainDoctor editorial team.