1. Home
  2. Directory
  3. California
  4. San Mateo
  5. Marriage Family Therapist
  6. NPI Profile

DIANA LEE DE GUZMAN
NPI 1699636225
Marriage & Family Therapist in San Mateo, CA

Active since November 21, 2025
650 N DELAWARE ST, SAN MATEO, CA 94401(650) 558-2376 Get Directions Write a Review

NPPES record last updated: November 21, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Diana Lee De Guzman NPPES

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

DIANA LEE DE GUZMAN (NPI 1699636225) is an individual marriage & family therapist in San Mateo, California, licensed in California (119740) and active in the NPI registry since November 2025.

NPPES Registry Identity

NPI1699636225
Entity TypeIndividualFemale
Primary Taxonomy106H00000X
Provider Legal NameDIANA LEE DE GUZMAN
Location Address650 N DELAWARE STSan Mateo, CA 94401-1732
Mailing Address650 N Delaware StSan Mateo, CA 94401-1732 · (650) 558-2376
Phone(650) 558-2376
Sole ProprietorYes
Enumeration DateNovember 21, 2025
NPPES CertifiedNovember 21, 2025
✔ NPI 1699636225 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers
Taxonomy Code106H00000X
License✔ Licensed in CA · 119740
Definition
A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups.
650 N DELAWARE ST, San Mateo, CA 94401
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.

MS. LUZ DENISE GOVEA M.A.
Marriage & Family Therapist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2776
MAXWELL E BERNSTEIN LMFT
Marriage & Family Therapist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2977
ROXANA DENISE MORALES MS, AMFT
Marriage & Family Therapist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2299
SAN MATEO UNION HIGH SCHOOL DISTRICT
Marriage & Family Therapist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2399
DR. LENIS COLTON BROWN LEP
Psychologist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (559) 305-2355
LISA LAUX
Counselor (School)
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2280
MS. CELINE LOVELACE M. ED.
Psychologist
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2779
LISA MICHELLE MEJIA-SANDOVAL PPS
Social Worker (School)
650 N DELAWARE ST
SAN MATEO, CA 94401
San Mateo County (650) 558-2299

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 Diana De Guzman's NPI number?

The NPI number for Diana De Guzman is 1699636225. It was assigned to this individual provider in the NPPES registry on November 21, 2025.

Where is Diana De Guzman located?

Diana De Guzman practices at 650 N Delaware St, San Mateo, CA 94401. The listed phone number is (650) 558-2376.

What is Diana De Guzman's specialty?

The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.

When was this NPI record last updated?

The NPPES record for Diana De Guzman was last updated on November 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.