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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MR. ROBERT JOSEPH GUILLEN RADT
NPI 1821726779
Counselor - Addiction (Substance Use Disorder) in San Jose, CA

Active since August 09, 2022
298 BERNAL RD, SAN JOSE, CA 95119(408) 780-0755(408) 956-6314 Get Directions Write a Review

NPPES record last updated: August 1, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 1, 2026, Aug 9, 2022 (2 updates tracked since 2022).

About Mr. Robert Joseph Guillen Radt NPPES

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

MR. ROBERT JOSEPH GUILLEN RADT (NPI 1821726779) is an individual addiction (substance use disorder) provider in San Jose, California, licensed in California (CI49050925) and active in the NPI registry since August 2022.

NPPES Registry Identity

NPI1821726779
Entity TypeIndividualMale
Primary Taxonomy101YA0400X
Provider Legal NameMR. ROBERT JOSEPH GUILLENCredential: RADT
Location Address298 BERNAL RDSan Jose, CA 95119-1809
Mailing Address298 Bernal RdSan Jose, CA 95119-1809 · (408) 780-0755
Phone(408) 780-0755
Fax(408) 956-6314
Sole ProprietorNo
Enumeration DateAugust 9, 2022
Last NPPES UpdateAugust 1, 20262 updates tracked since enumeration
NPPES CertifiedAugust 1, 2026
✔ NPI 1821726779 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers
Taxonomy Code101YA0400X
License✔ Licensed in CA · CI49050925
298 BERNAL RD, San Jose, CA 95119
Open in Google Maps ↗

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.

MISS FELICIA ANN HOFFMAN RESIDENTIAL COUN
Counselor (Mental Health)
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 404-8673
ALAN KINH ARMENTA
Rehabilitation Practitioner
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 638-4744
TIMOTHY WILLIAM PETTETT SUDRC #16547
Counselor
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (510) 337-7950
SOKUNTHEA CHEA
Licensed Psychiatric Technician
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 404-8673
ALMA A MARTINEZ
Rehabilitation Counselor
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 498-7906
ARISTIDES MELGOZA PULIDO
Rehabilitation Practitioner
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 498-7906
MRS. BLANCA ALICIA CARRILLO-SERRANO A.S.W.
Social Worker (Clinical)
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (408) 629-0713
MARISELA VASQUEZ
Case Manager/Care Coordinator
298 BERNAL RD
SAN JOSE, CA 95119
Santa Clara County (669) 216-0076

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 Robert Guillen's NPI number?

The NPI number for Robert Guillen is 1821726779. It was assigned to this individual provider in the NPPES registry on August 9, 2022.

Where is Robert Guillen located?

Robert Guillen practices at 298 Bernal Rd, San Jose, CA 95119. The listed phone number is (408) 780-0755.

What is Robert Guillen's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for Robert Guillen was last updated on August 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days 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.