IndividualActive
John Castillo
NPI 1821926411 · Behavior Technician · Alhambra, CA
John Castillo is a Behavior Technician provider in Alhambra, CA (NPI 1821926411).
Provider details
- NPI number
- 1821926411
- Entity type
- Individual
- Primary specialty
- Behavior TechnicianBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
- License
- 106S00000X (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Established profile(53/100 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
100% 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
1000 S Fremont Ave
Unit 20 Bldg. A10 Suite 10100
Alhambra, CA 91803-8840
Phone: (626) 349-3838
Fax: (855) 838-9042
Street-level locationGet directions
Mailing address
1000 S Fremont Ave Bldg A10s
Alhambra, CA 91803-8800
Registry dates
- Enumerated
- 2026-05-12
- Last updated
- 2026-05-22
- Certified
- 2026-05-22
Frequently asked questions
- What is John Castillo's NPI number?
- John Castillo's National Provider Identifier (NPI) is 1821926411, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Castillo's specialty?
- John Castillo is listed in the NPPES registry with a primary specialty of Behavior Technician (Behavioral Health & Social Service Providers).
- Where is John Castillo located?
- John Castillo's practice location on file with NPPES is 1000 S Fremont Ave, Alhambra, CA 91803-8840.
- What is John Castillo's phone number?
- The practice phone number listed in the NPPES registry for John Castillo is (626) 349-3838.
- Is John Castillo's NPI active?
- Yes — John Castillo's NPI (1821926411) is active in the NPPES registry as of the last update on 2026-05-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.