DIANA DIAZ CNM
NPI 1033097555
Advanced Practice Midwife in Greenbrae, CA

Q: What is Diana Diaz's NPI number?

The NPI number for Diana Diaz is 1033097555. It was assigned to this individual provider in the NPPES registry on August 22, 2025. The provider is also known as Diana Tenjo Barrera.

Q: What is Diana Diaz's specialty?

The primary specialty registered for this NPI is Advanced Practice Midwife with taxonomy code 367A00000X.

Q: When was this NPI record last updated?

The NPPES record for Diana Diaz was last updated on February 12, 2026. 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.

Active since August 22, 2025PECOS Enrolled

250 BON AIR RD, GREENBRAE, CA 94904(415) 925-7000 Get Directions Write a Review

NPPES record last updated: February 12, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Diana Diaz Cnm NPPES

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

DIANA DIAZ CNM (NPI 1033097555) is an individual advanced practice midwife in Greenbrae, California, licensed in California (NMW236582) and active in the NPI registry since August 2025. She is enrolled in Medicare PECOS and is a graduate of Other (2025).

NPPES Registry Identity

NPI1033097555

Entity TypeIndividualFemale

Primary Taxonomy367A00000X

Provider Legal NameDIANA DIAZCredential: CNM

Location Address250 BON AIR RDGreenbrae, CA 94904-1702

Mailing Address250 Bon Air RdGreenbrae, CA 94904-1702 · (415) 925-7000

Phone(415) 925-7000

Sole ProprietorNo

Medical School CMSOtherGraduated 2025

Enumeration DateAugust 22, 2025

Last NPPES UpdateFebruary 12, 2026

NPPES CertifiedFebruary 12, 2026

✔ NPI 1033097555 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAdvanced Practice MidwifePhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code367A00000X

License✔ Licensed in CA · NMW236582

Definition

Advanced practice midwifery encompasses the independent provision of care during pregnancy, childbirth, and the postpartum period; sexual and reproductive health; gynecologic health; and family planning services, including preconception care. Midwives also provide primary care for individuals from adolescence throughout the lifespan as well as care for the healthy newborn during the first 28 days of life. Midwives provide initial and ongoing comprehensive assessment, diagnosis, and treatment. Midwifery care includes health promotion, disease prevention, risk assessment and management, and individualized wellness education and counseling. Source: American College of Nurse-Midwives, www.midwife.org Additional Resources: See the American College of Nurse-Midwives, www.midwife.org, for more information on Certified Nurse-Midwives, Certified Midwives, the American Midwifery Certification Board (AMCB), and licensure.

250 BON AIR RD, Greenbrae, CA 94904

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Other Names 1

Former Name (1)Diana Tenjo Barrera

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Diana Diaz Cnm is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2264913482

PECOS Enrollment IDI20260225004347

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

Regents Univ Of California Ucsf

13 mi

Internal Medicine

505 PARNASSUS AVE
San Francisco, CA 94143

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

NPI 1124439807 (415) 476-1000

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 94904 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

$104.67 typical visit price

range $69.07 – $202.63

Typical copayment $26.16 (range $17.26 – $50.65)

Most-billed visit code 99203

Established Patient

$85.00 typical visit price

range $23.44 – $166.64

Typical copayment $21.25 (range $5.86 – $41.66)

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 20

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

MESKEREM DABA RN, BSN

Registered Nurse (Psychiatric/Mental Health)

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 473-6666

ALEC CHANG D.O.

Psychiatry & Neurology (Psychiatry)

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 473-6835

MARIN HOSPITALIST MEDICAL GROUP, INC.

Internal Medicine

250 BON AIR RD, 3RD FLOOR
GREENBRAE, CA 94904

Marin County (415) 925-7545

DR. STEPHEN C ALLISON M.D.

Psychiatry & Neurology (Psychiatry)

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 925-7663

ANNIE LINN STODDARD

Rehabilitation Practitioner

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 473-6835

SARENA NAPIER ASW

Counselor (Mental Health)

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 473-6619

JULIET LIANNE HUNTINGTON CNM

Advanced Practice Midwife

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 925-7010

ZAMBIA RICHEA PLAYER RN

Registered Nurse

250 BON AIR RD
GREENBRAE, CA 94904

Marin County (415) 473-6666

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 Diaz's NPI number?

The NPI number for Diana Diaz is 1033097555. It was assigned to this individual provider in the NPPES registry on August 22, 2025. The provider is also known as Diana Tenjo Barrera.

Where is Diana Diaz located?

Diana Diaz practices at 250 Bon Air Rd, Greenbrae, CA 94904. The listed phone number is (415) 925-7000.

What is Diana Diaz's specialty?

The primary specialty registered for this NPI is Advanced Practice Midwife with taxonomy code 367A00000X.

Is Diana Diaz enrolled in Medicare?

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

Which organization bills Medicare for Diana Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diana Diaz reassigns Medicare benefits to Regents Univ Of California Ucsf (San Francisco, 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 Diana 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 Diana Diaz was last updated on February 12, 2026. 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.