TERESA LYNN DIAZ MD
NPI 1194735753
Obstetrics & Gynecology in Oakland, CA

Q: What is Teresa Diaz's NPI number?

The NPI number for Teresa Diaz is 1194735753. It was assigned to this individual provider in the NPPES registry on August 8, 2006. The provider is also known as Teresa Lynn Rattler MD.

Q: What is Teresa Diaz's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: Is Teresa Diaz enrolled in Medicare?

No. Teresa Diaz has opted out of Medicare through November 7, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Teresa Diaz was last updated on February 21, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.

Active since August 08, 2006Opted out of Medicare · through Nov 7, 2026

1411 E 31ST STREET, OAKCARE MEDICAL GROUP, OAKLAND, CA 94602(510) 437-4323(510) 437-5042 Get Directions Write a Review

NPPES record last updated: February 21, 2012. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Teresa Lynn Diaz Md NPPES

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

TERESA LYNN DIAZ MD (NPI 1194735753) is an individual obstetrics & gynecology provider in Oakland, California, licensed in California (A88588) and active in the NPI registry since August 2006. She has opted out of Medicare through November 7, 2026 and remains eligible to order and refer.

NPPES Registry Identity

NPI1194735753

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameTERESA LYNN DIAZCredential: MD

Location Address1411 E 31ST STREET, OAKCARE MEDICAL GROUPOakland, CA 94602-1080

Mailing Address1411 E 31st Street, Oakcare Medical GroupOakland, CA 94602-1080 · (510) 437-4323 · Fax (510) 437-5042

Phone(510) 437-4323

Fax(510) 437-5042

Sole ProprietorNo

Enumeration DateAugust 8, 2006

Last NPPES UpdateFebruary 21, 2012

✔ NPI 1194735753 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in CA · A88588

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

1411 E 31ST STREET, Oakland, CA 94602

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Other Names 1

Former Name (1)Teresa Lynn Rattler Md

Other Identifiers 3

Medicare UPINI18156

Medicare ID-Type Unspecified00A885880CA

Medicaid00A885880CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Teresa Lynn Diaz Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from November 7, 2018 through November 7, 2026.

Opt-Out Effective DateNovember 7, 2018

Opt-Out In Effect ThroughNovember 7, 2026Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94602 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

$153.83 typical visit price

range $69.00 – $202.35

Typical copayment $38.45 (range $17.25 – $50.58)

Most-billed visit code 99204

Established Patient

$84.91 typical visit price

range $23.44 – $166.46

Typical copayment $21.22 (range $5.86 – $41.61)

Most-billed visit code 99213

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 17

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

DENISE TUKENMEZ MD

Pediatrics

1411 E 31ST STREET, OAKCARE MEDICAL GROUP
OAKLAND, CA 94602

Alameda County (510) 437-4323

SONJI FRANCINE WALKER MSW

Social Worker (Clinical)

1411 E 31ST STREET
OAKLAND, CA 94602

Alameda County (510) 437-4688

RONALD ADLER MD

Internal Medicine (Gastroenterology)

1411 E 31ST STREET, OAKCARE MEDICAL GROUP
OAKLAND, CA 94602

Alameda County (510) 437-4323

BRADLEY JACKSON HOLDEN MD

Pediatrics (Neonatal-Perinatal Medicine)

1411 E 31ST STREET, OAK CARE MED GRP
OAKLAND, CA 94602

Alameda County (510) 437-4323

ZEV MASON FELIX DO

Student in an Organized Health Care Education/Training Program

1411 E 31ST STREET, QIC 22134 DEPT OF SURGERY
OAKLAND, CA 94602

Alameda County (510) 437-4401

MS. AMY ELISABETH HERRICK CRNA

Nurse Anesthetist, Certified Registered

1411 E 31ST STREET
OAKLAND, CA 94602

Alameda County (510) 437-4366

KATHLEEN ANNE CLANON MD

Allergy & Immunology

1411 E 31ST STREET
OAKLAND, CA 94602

Alameda County (510) 437-4323

ALAMEDA HEALTH SYSTEM

General Acute Care Hospital

1411 E 31ST STREET
OAKLAND, CA 94602

Alameda County (510) 437-4800

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 Teresa Diaz's NPI number?

The NPI number for Teresa Diaz is 1194735753. It was assigned to this individual provider in the NPPES registry on August 8, 2006. The provider is also known as Teresa Lynn Rattler MD.

Where is Teresa Diaz located?

Teresa Diaz practices at 1411 E 31st Street Oakcare Medical Group, Oakland, CA 94602. The listed phone number is (510) 437-4323.

What is Teresa Diaz's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Teresa Diaz enrolled in Medicare?

No. Teresa Diaz has opted out of Medicare through November 7, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Teresa Diaz was last updated on February 21, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.