WILLIAM ELY FONSECA
NPI 1639043169
Behavior Technician in Antioch, CA

Active since September 29, 2025
1887 MOUNT GOETHE WAY, ANTIOCH, CA 94531(925) 690-7911 Get Directions Write a Review

NPPES record last updated: September 29, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About William Ely Fonseca NPPES

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

WILLIAM ELY FONSECA (NPI 1639043169) is an individual behavior technician in Antioch, California and active in the NPI registry since September 2025.

NPPES Registry Identity

NPI1639043169
Entity TypeIndividualMale
Primary Taxonomy106S00000X
Provider Legal NameWILLIAM ELY FONSECA
Location Address1887 MOUNT GOETHE WAYAntioch, CA 94531-9077
Mailing Address1887 Mount Goethe WayAntioch, CA 94531-9077 · (925) 690-7911
Sole ProprietorNo
Enumeration DateSeptember 29, 2025
NPPES CertifiedSeptember 29, 2025
NPI 1639043169 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyBehavior TechnicianBehavioral Health & Social Service Providers
Taxonomy Code106S00000X
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.
1887 MOUNT GOETHE WAY, Antioch, CA 94531

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 William Fonseca's NPI number?

The NPI number for William Fonseca is 1639043169. It was assigned to this individual provider in the NPPES registry on September 29, 2025.

Where is William Fonseca located?

William Fonseca practices at 1887 Mount Goethe Way, Antioch, CA 94531. The listed phone number is (925) 690-7911.

What is William Fonseca'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 William Fonseca was last updated on September 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.