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

MR. DAMIEN DAVID DIAZ
NPI 1831505452
Marriage & Family Therapist in Pleasanton, CA

Active since July 02, 2014PECOS EnrolledAccepts Medicare Assignment
3825 HOPYARD RD STE 140, PLEASANTON, CA 94588(925) 847-5051 Get Directions Write a Review

NPPES record last updated: November 28, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 28, 2022, Jun 20, 2019, Jun 25, 2018 (3 updates tracked since 2018).

About Mr. Damien David Diaz NPPES

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

MR. DAMIEN DAVID DIAZ (NPI 1831505452) is an individual marriage & family therapist in Pleasanton, California and active in the NPI registry since July 2014. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2015).

NPPES Registry Identity

NPI1831505452
Entity TypeIndividualMale
Primary Taxonomy106H00000X
Provider Legal NameMR. DAMIEN DAVID DIAZ
Location Address3825 HOPYARD RD STE 140Pleasanton, CA 94588-8530
Mailing Address3825 Hopyard Rd Ste 140Pleasanton, CA 94588-8530 · (925) 847-5051
Phone(925) 847-5051
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateJuly 2, 2014
Last NPPES UpdateNovember 28, 20223 updates tracked since enumeration
NPPES CertifiedNovember 28, 2022
✔ NPI 1831505452 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers
Taxonomy Code106H00000X
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.
3825 HOPYARD RD STE 140, Pleasanton, CA 94588
Open in Google Maps ↗

Secondary Practice Locations 3

Location 123119 Cottonwood Ave Ste 100Moreno Valley, CA 92553-9661 · Phone (951) 413-5130 · Fax (951) 413-5230
Location 22085 Rustin Ave # 3Riverside, CA 92507-2498 · Phone (951) 955-2105
Location 33525 Presley AveRiverside, CA 92507 · Phone (951) 782-2400 · Fax (951) 683-4904

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mr. Damien David Diaz is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5991140766
PECOS Enrollment IDI20240302000388
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Damien Diaz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
22 mi
Internal Medicine
1190 VETERANS BLVD
Redwood City, CA 94063
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1639252604 (650) 299-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 6

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

DR. TOM JOSHUA PILLE WY DO
Psychiatry & Neurology (Psychiatry)
3825 HOPYARD RD STE 140
PLEASANTON, CA 94588
Alameda County (925) 847-5051
MS. EVELYN MASCARENAS
Social Worker (Clinical)
3825 HOPYARD RD STE 140
PLEASANTON, CA 94588
Alameda County (925) 847-5051
DR. ROBERT ERIC CHRISTENSEN PSY.D.
Psychologist (Clinical)
3825 HOPYARD RD STE 140, KAISER PLEASANTON DEP OF MENTAL HEALTH
PLEASANTON, CA 94588
Alameda County (925) 847-5630
SHIELA ADVANI PHARMD.
Pharmacist
3825 HOPYARD RD STE 140
PLEASANTON, CA 94588
Alameda County (925) 847-5583
MS. STEFANI COLEMAN
Marriage & Family Therapist
3825 HOPYARD RD STE 140
PLEASANTON, CA 94588
Alameda County (925) 847-5051
TIMOTHY CRAWFORD AMFT
Marriage & Family Therapist
3825 HOPYARD RD STE 140
PLEASANTON, CA 94588
Alameda County (925) 847-5192

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 Damien Diaz's NPI number?

The NPI number for Damien Diaz is 1831505452. It was assigned to this individual provider in the NPPES registry on July 2, 2014.

Where is Damien Diaz located?

Damien Diaz practices at 3825 Hopyard Rd Ste 140, Pleasanton, CA 94588. The listed phone number is (925) 847-5051.

What is Damien Diaz's specialty?

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

Is Damien Diaz enrolled in Medicare?

Yes. Damien Diaz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Damien Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Damien Diaz reassigns Medicare benefits to Permanente Medical Group Inc (Redwood City, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Damien Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Damien Diaz was last updated on November 28, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.