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MARIA MILAGROS DIAZ M.D.
NPI 1609308089
Obstetrics & Gynecology in Olympia, WA

Active since April 03, 2017PECOS Enrolled
700 LILLY RD NE, OLYMPIA, WA 98506(360) 923-7000(360) 923-7089 Get Directions Write a Review

NPPES record last updated: September 1, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Maria Milagros Diaz M.d. NPPES

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

MARIA MILAGROS DIAZ M.D. (NPI 1609308089) is an individual obstetrics & gynecology provider in Olympia, Washington, licensed in Washington (MD61150295) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS and maintains a secondary practice location in Las Vegas.

NPPES Registry Identity

NPI1609308089
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameMARIA MILAGROS DIAZCredential: M.D.
Location Address700 LILLY RD NEOlympia, WA 98506-5115
Mailing Address700 Lilly Rd NeOlympia, WA 98506-5115 · (360) 923-7000 · Fax (360) 923-7089
Phone(360) 923-7000
Fax(360) 923-7089
Sole ProprietorNo
Enumeration DateApril 3, 2017
Last NPPES UpdateSeptember 1, 2021
NPPES CertifiedSeptember 1, 2021
✔ NPI 1609308089 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in WA · MD61150295
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.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
700 LILLY RD NE, Olympia, WA 98506
Open in Google Maps ↗

Secondary Practice Location 1

Location 13100 N Tenaya Way, Graduate Medical EducationLas Vegas, NV 89128-0436 · Phone (702) 962-9552

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Maria Milagros Diaz M.d. 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 Reassignments

2

Medicare enrollment records show Maria Diaz reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Kaiser Foundation Health Plan Of Washington
40 mi
Multi-Specialty
2715 NACHES AVE SW # GSWA1N02
Renton, WA 98057
  • Reassigned Medicare billing, Washington enrollment
  • 2,678 clinicians in this Medicare group
NPI 1124264577 (509) 241-7349
Magella Medical Group, Inc.
946 mi
Maternal & Fetal Medicine
2888 LONG BEACH BLVD STE 400
Long Beach, CA 90806
  • Reassigned Medicare billing, California enrollment
  • 191 clinicians in this Medicare group
NPI 1376640086 (562) 997-8510

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 98506 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
$130.99 typical visit price
range $57.27 – $172.80
Typical copayment $32.74 (range $14.31 – $43.20)
Most-billed visit code 99204
Established Patient
$71.29 typical visit price
range $18.56 – $141.11
Typical copayment $17.82 (range $4.64 – $35.27)
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.

AMIHAN A FERRER M.D.
Family Medicine
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
DAVID A REMIS
Dermatology
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
MICHAEL W BALFE M.D.
Family Medicine
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
STACY E DELL
Counselor (Mental Health)
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
GORDON WHEAT M.D.
Family Medicine
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
MONIQUE C. SEMIEN MD
Internal Medicine (Hematology & Oncology)
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
BAHRAM BADRI
Family Medicine
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000
ELIZABETH A HOWELL MD
Obstetrics & Gynecology
700 LILLY RD NE
OLYMPIA, WA 98506
Thurston County (360) 923-7000

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 Maria Diaz's NPI number?

The NPI number for Maria Diaz is 1609308089. It was assigned to this individual provider in the NPPES registry on April 3, 2017.

Where is Maria Diaz located?

Maria Diaz practices at 700 Lilly Rd NE, Olympia, WA 98506. The listed phone number is (360) 923-7000.

What is Maria Diaz's specialty?

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

Is Maria Diaz enrolled in Medicare?

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

Which organizations bill Medicare for Maria Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maria Diaz reassigns Medicare benefits to 2 organizations: Kaiser Foundation Health Plan Of Washington (Renton, WA) and Magella Medical Group, Inc. (Long Beach, CA). Each 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 Maria 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 Maria Diaz was last updated on September 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.