BERTHA ALICIA DIAZ MFT
NPI 1003023698
Marriage & Family Therapist in Martinez, CA
About Bertha Alicia Diaz Mft NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
BERTHA ALICIA DIAZ MFT (NPI 1003023698) is an individual marriage & family therapist in Martinez, California, licensed in California (MFC45501) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Bertha Alicia Diaz Mft is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Bertha Diaz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Martinez, CA 94553
- Reassigned Medicare billing, California enrollment
- 530 clinicians in this Medicare group
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MARTINEZ, CA 94553
MARTINEZ, CA 94553
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 Bertha Diaz's NPI number?
The NPI number for Bertha Diaz is 1003023698. It was assigned to this individual provider in the NPPES registry on May 16, 2007.
Where is Bertha Diaz located?
Bertha Diaz practices at 1340 Arnold Dr Ste 200, Martinez, CA 94553. The listed phone number is (925) 957-5150.
What is Bertha Diaz's specialty?
The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.
Is Bertha Diaz enrolled in Medicare?
Yes. Bertha Diaz is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Bertha Diaz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Bertha Diaz reassigns Medicare benefits to Contra Costa County (Martinez, 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 Bertha 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 Bertha Diaz was last updated on November 15, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Bertha Alicia Diaz, MFT · NPI 1003023698
Marriage & Family Therapist provider in Martinez, California. Individual provider, active in the CMS NPPES registry since May 16, 2007.
## Identity
- **NPI:** 1003023698 (Entity type: Individual)
- **Enumerated:** May 16, 2007
- **Primary specialty:** Marriage & Family Therapist · taxonomy 106H00000X
- **State license:** MFC45501 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1340 ARNOLD DR STE 200, Martinez, CA 94553-4189
- **Phone:** (925) 957-5150
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Contra Costa County (NPI 1750509162, Martinez, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 15, 2010
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Source: [NPI Profile](https://npiprofile.com/npi/1003023698) · Data from the CMS NPPES public registry.