IndividualActive
Matthew Williamson
NPI 1043199003 · Behavior Technician · Monrovia, CA
Matthew Williamson is a Behavior Technician provider in Monrovia, CA (NPI 1043199003).
Provider details
- NPI number
- 1043199003
- Entity type
- Individual
- Primary specialty
- Behavior TechnicianBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Basic profile(47/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
1333 S Mayflower Ave
Suite 220
Monrovia, CA 91016-4066
Phone: (818) 241-6780
Fax: (888) 588-2752
Street-level locationGet directions
Mailing address
1333 S Mayflower Ave
Monrovia, CA 91016-4066
Registry dates
- Enumerated
- 2025-09-02
- Last updated
- 2025-09-02
- Certified
- 2025-09-02
Frequently asked questions
- What is Matthew Williamson's NPI number?
- Matthew Williamson's National Provider Identifier (NPI) is 1043199003, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Williamson's specialty?
- Matthew Williamson is listed in the NPPES registry with a primary specialty of Behavior Technician (Behavioral Health & Social Service Providers).
- Where is Matthew Williamson located?
- Matthew Williamson's practice location on file with NPPES is 1333 S Mayflower Ave, Monrovia, CA 91016-4066.
- What is Matthew Williamson's phone number?
- The practice phone number listed in the NPPES registry for Matthew Williamson is (818) 241-6780.
- Is Matthew Williamson's NPI active?
- Yes — Matthew Williamson's NPI (1043199003) is active in the NPPES registry as of the last update on 2025-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.