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VIVIAN TY WAN DO
NPI 1659832251
Obstetrics & Gynecology in Mountain View, CA

Active since March 26, 2019PECOS Enrolled
2495 HOSPITAL DR STE 670, MOUNTAIN VIEW, CA 94040(650) 396-8110 Get Directions Write a Review

NPPES record last updated: October 2, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 2, 2024, Jul 28, 2023 (2 updates tracked since 2023).

About Vivian Ty Wan Do NPPES

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

VIVIAN TY WAN DO (NPI 1659832251) is an individual obstetrics & gynecology provider in Mountain View, California, licensed in New York (322276) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659832251
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameVIVIAN TY WANCredential: DO
Location Address2495 HOSPITAL DR STE 670Mountain View, CA 94040-4187
Mailing Address2495 Hospital Dr Ste 670Mountain View, CA 94040-4187 · (650) 396-8110
Phone(650) 396-8110
Sole ProprietorNo
Enumeration DateMarch 26, 2019
Last NPPES UpdateOctober 2, 20242 updates tracked since enumeration
NPPES CertifiedOctober 2, 2024
✔ NPI 1659832251 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 NY · 322276
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
2495 HOSPITAL DR STE 670, Mountain View, CA 94040
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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)

Vivian Ty Wan 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 Vivian Wan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Doctor Azad, Medical Corporation
Same address
Obstetrics & Gynecology
2495 HOSPITAL DR STE 670
Mountain View, CA 94040
  • Reassigned Medicare billing, California enrollment
  • 7 clinicians in this Medicare group
NPI 1740410836 (650) 396-8110

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 94040 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
$156.67 typical visit price
range $70.37 – $206.04
Typical copayment $39.16 (range $17.59 – $51.51)
Most-billed visit code 99204
Established Patient
$86.56 typical visit price
range $23.96 – $169.60
Typical copayment $21.64 (range $5.99 – $42.40)
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 4

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

DR. CHRISTINA KATHERINE LAM D.O.
Obstetrics & Gynecology
2495 HOSPITAL DR STE 670
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 396-8110
DR. POOJA GUPTA M.D
Obstetrics & Gynecology
2495 HOSPITAL DR STE 670
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 396-8110
DR. SARAH PASHTOON AZAD MD
Obstetrics & Gynecology
2495 HOSPITAL DR STE 670
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 396-8110
DOCTOR AZAD, MEDICAL CORPORATION
Obstetrics & Gynecology
2495 HOSPITAL DR STE 670
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 396-8110

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 Vivian Wan's NPI number?

The NPI number for Vivian Wan is 1659832251. It was assigned to this individual provider in the NPPES registry on March 26, 2019.

Where is Vivian Wan located?

Vivian Wan practices at 2495 Hospital Dr Ste 670, Mountain View, CA 94040. The listed phone number is (650) 396-8110.

What is Vivian Wan's specialty?

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

Is Vivian Wan enrolled in Medicare?

Yes. Vivian Wan is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Vivian Wan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Vivian Wan reassigns Medicare benefits to Doctor Azad, Medical Corporation (Mountain View, 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 Vivian Wan'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 Vivian Wan was last updated on October 2, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.