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

GUADALUPE YESSENIA DIAZ DO
NPI 1164088548
Family Medicine in Madera, CA

Q: What is Guadalupe Diaz's NPI number?

The NPI number for Guadalupe Diaz is 1164088548. It was assigned to this individual provider in the NPPES registry on May 11, 2019.

Q: What is Guadalupe Diaz's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Q: When was this NPI record last updated?

The NPPES record for Guadalupe Diaz was last updated on October 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.

Active since May 11, 2019PECOS Enrolled

344 E 6TH ST, MADERA, CA 93638(559) 664-4000(559) 675-5224 Get Directions Write a Review

NPPES record last updated: October 7, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 7, 2026, Jan 2, 2026, Jun 5, 2024 and 1 more (4 updates tracked since 2019).

On this page

About Guadalupe Yessenia Diaz Do NPPES

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

GUADALUPE YESSENIA DIAZ DO (NPI 1164088548) is an individual family medicine provider in Madera, California, licensed in California (20A22524) and active in the NPI registry since May 2019. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1164088548

Entity TypeIndividualFemale

Primary Taxonomy207Q00000X

Provider Legal NameGUADALUPE YESSENIA DIAZCredential: DO

Location Address344 E 6TH STMadera, CA 93638-3631

Mailing Address344 E 6th StMadera, CA 93638-3631 · (559) 664-4000 · Fax (559) 675-5224

Phone(559) 664-4000

Fax(559) 675-5224

Sole ProprietorNo

Enumeration DateMay 11, 2019

Last NPPES UpdateOctober 7, 20264 updates tracked since enumeration

NPPES CertifiedOctober 7, 2026

✔ NPI 1164088548 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in CA · 20A22524

Definition

Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

344 E 6TH ST, Madera, CA 93638

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Guadalupe Yessenia Diaz Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Guadalupe Diaz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Faculty Associates , Inc.

18 mi

Vascular Surgery

1247 E ALLUVIAL AVE, SUITE 101
Fresno, CA 93720

Reassigned Medicare billing, California enrollment
320 clinicians in this Medicare group

NPI 1881092963 (559) 431-6226

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93638 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$90.32 typical visit price

range $58.87 – $176.60

Typical copayment $22.58 (range $14.71 – $44.15)

Most-billed visit code 99203

Established Patient

$103.36 typical visit price

range $19.28 – $144.60

Typical copayment $25.84 (range $4.82 – $36.15)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

SOLEDAD REYES FNP-C

Nurse Practitioner (Family)

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 666-4000

DANIELA IVONNE ULLOA

Dentist

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

ALONDRA JUAREZ

Social Worker (Clinical)

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

MADHURI SHUKLA APRN

Nurse Practitioner

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

ALEXANDRIA SHEREE ROMERO PA-C

Physician Assistant

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

HARJEET K GILL NP

Nurse Practitioner (Family)

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

CAROLINA GUTIERREZ GARCIA

Family Medicine

344 E 6TH ST
MADERA, CA 93638

Madera County (442) 228-0681

DR. GERARD N MAZO MD

General Practice

344 E 6TH ST
MADERA, CA 93638

Madera County (559) 664-4000

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 Guadalupe Diaz's NPI number?

The NPI number for Guadalupe Diaz is 1164088548. It was assigned to this individual provider in the NPPES registry on May 11, 2019.

Where is Guadalupe Diaz located?

Guadalupe Diaz practices at 344 E 6th St, Madera, CA 93638. The listed phone number is (559) 664-4000.

What is Guadalupe Diaz's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Guadalupe Diaz enrolled in Medicare?

Yes. Guadalupe Diaz is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Guadalupe Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Guadalupe Diaz reassigns Medicare benefits to University Faculty Associates , Inc. (Fresno, 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 Guadalupe 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 Guadalupe Diaz was last updated on October 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.