Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Jeffrey Guillen
Behavior Analyst in El Cajon, CA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1356842165
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Registry record
Entity type Individual (Type 1)
Name Jeffrey Guillen
Sex Male
Practice address 321 Van Houten Ave, El Cajon, CA, 92020
Phone (619) 383-0704
Enumeration date Feb 27, 2018
Last updated in NPPES Feb 27, 2018
Taxonomy & licenses
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty.
Frequently asked questions
Where does Jeffrey Guillen practice?
The practice location on file with NPPES is in El Cajon, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Jeffrey Guillen?
The National Provider Identifier (NPI) for Jeffrey Guillen is 1356842165, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Madeline Aguirre Behavior Analyst · El Cajon, CA NPI 1639612955 Albena Apostolova Rank Behavior Analyst · El Cajon, CA NPI 1568901320 Maricris Nailes Behavior Analyst · El Cajon, CA NPI 1710491576 Liana Babayan Behavior Analyst · El Cajon, CA NPI 1003324641 Kaela Potter Behavior Analyst · El Cajon, CA NPI 1043718828 Nicholas Woo-Vonhoogenstyn Behavior Analyst · El Cajon, CA NPI 1316447089 Mariah Arevalo Behavior Technician · El Cajon, CA NPI 1699275230 Victoria Ham Behavior Technician · El Cajon, CA NPI 1033610258
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-02-27.