Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

JOHN CHRISTOPHER CASTILLO
NPI 1821926411
Behavior Technician in Alhambra, CA

Active since May 12, 2026
1000 S FREMONT AVE, UNIT 20 BLDG. A10 SUITE 10100, ALHAMBRA, CA 91803(626) 349-3838(855) 838-9042 Get Directions Write a Review

NPPES record added: May 22, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: May 22, 2026, May 12, 2026 (2 updates tracked since 2026).

About John Christopher Castillo NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN CHRISTOPHER CASTILLO (NPI 1821926411) is an individual behavior technician in Alhambra, California, licensed in California (106S00000X) and active in the NPI registry since May 2026.

NPPES Registry Identity

NPI1821926411
Entity TypeIndividualMale
Primary Taxonomy106S00000X
Provider Legal NameJOHN CHRISTOPHER CASTILLO
Location Address1000 S FREMONT AVE, UNIT 20 BLDG. A10 SUITE 10100Alhambra, CA 91803-8840
Mailing Address1000 S Fremont Ave Bldg A10sAlhambra, CA 91803-8800 · (626) 349-3838 · Fax (855) 838-9042
Fax(855) 838-9042
Sole ProprietorNo
Enumeration DateMay 12, 2026
Last NPPES UpdateMay 22, 20262 updates tracked since enumeration
NPPES CertifiedMay 22, 2026
NPI 1821926411 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyBehavior TechnicianBehavioral Health & Social Service Providers
Taxonomy Code106S00000X
License Licensed in CA · 106S00000X
Definition
The behavior technician is a paraprofessional who practices under the close, ongoing supervision of a behavior analyst or assistant behavior analyst certified by the Behavior Analyst Certification Board and/or credentialed by a state (such as through licensure). The behavior technician is primarily responsible for the implementation of components of behavior-analytic treatment plans developed by the supervisor. That may include collecting data on treatment targets and conducting certain types of behavioral assessments (e.g., stimulus preference assessments). The behavior technician does not design treatment or assessment plans or procedures but provides services as assigned by the supervisor responsible for his or her work.
1000 S FREMONT AVE, Alhambra, CA 91803

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Physician Assistant (Medical)
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Behavior Technician
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Behavior Technician
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Student in an Organized Health Care Education/Training Program
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Student in an Organized Health Care Education/Training Program
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Behavior Technician
1000 S FREMONT AVE
ALHAMBRA, CA 91803
Physical Therapist (Pediatrics)
1000 S FREMONT AVE, UNIT 27
ALHAMBRA, CA 91803
Behavior Technician
1000 S FREMONT AVE
ALHAMBRA, CA 91803

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Castillo's NPI number?

The NPI number for John Castillo is 1821926411. It was assigned to this individual provider in the NPPES registry on May 12, 2026.

Where is John Castillo located?

John Castillo practices at 1000 S Fremont Ave Unit 20 Bldg. A10 Suite 10100, Alhambra, CA 91803. The listed phone number is (626) 349-3838.

What is John Castillo's specialty?

The primary specialty registered for this NPI is Behavior Technician with taxonomy code 106S00000X.

When was this NPI record last updated?

The NPPES record for John Castillo was last updated on May 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.