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BAY AREA GYNECOLOGY ONCOLOGY INC
NPI 1891801122
Specialist in Campbell, CA

Active since August 21, 2006
910 CAMPISI WAY STE 2A, CAMPBELL, CA 95008(408) 827-4274(408) 827-4275 Get Directions Write a Review

NPPES record last updated: September 29, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 17, 2025, Oct 9, 2024, May 8, 2023 and 1 more (4 updates tracked since 2022).

About Bay Area Gynecology Oncology Inc NPPES

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

BAY AREA GYNECOLOGY ONCOLOGY INC (NPI 1891801122), doing business as Bay Area Gynecology Oncology, is a healthcare organization registered as a specialist in Campbell, California and active in the NPI registry since August 2006. The organization lists James Frederick Lilja, Director, as its authorized official.

NPPES Registry Identity

NPI1891801122
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameBAY AREA GYNECOLOGY ONCOLOGY INC
Location Address910 CAMPISI WAY STE 2ACampbell, CA 95008-2351
Mailing AddressPo Box 33235Los Gatos, CA 95031-3235
Phone(408) 827-4274
Fax(408) 827-4275
Organization SubpartNo
Authorized OfficialJames Frederick LiljaDirector · (408) 827-4274
Enumeration DateAugust 21, 2006
Last NPPES UpdateSeptember 29, 20254 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2025
✔ NPI 1891801122 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
Licenses✔ Licensed in CA · G85643✔ Licensed in CA · A068842
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
910 CAMPISI WAY STE 2A, Campbell, CA 95008
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Other Names 1

Doing Business AsBay Area Gynecology Oncology

Other Identifiers 4

OtherG85643CA · License Dr. Lilja
Medicaid00A068842CA
OtherA068842CA · License Dr. Manuel
Medicaid00G856431CA

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Bay Area Gynecology Oncology Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

6

Medicare enrollment records show 6 clinicians reassign Medicare billing to Bay Area Gynecology Oncology Inc, which bills Medicare for the services they deliver. Of these, 3 practice at this address and 5 within 10 miles. They are listed nearest first.

Clinicians, nearest first (6)

Elaine Lee, M.D.
Surgical Oncology
NPI 1619243086
910 CAMPISI WAY STE 2A
Campbell, CA 95008
(408) 827-4274
✔ PECOS✔ Accepts MedicareSame address
James Lilja, M.D.
Obstetrics/Gynecology
NPI 1225081441
910 CAMPISI WAY STE 2A
Campbell, CA 95008
(408) 827-4274
✔ PECOS✔ Accepts MedicareSame address
Tiffany Sia, M.D.
Obstetrics/Gynecology
NPI 1760915912
910 CAMPISI WAY STE 2A
Campbell, CA 95008
(408) 827-4274
✔ PECOS✔ Accepts MedicareSame address
Katherine Volpe, MD
Urology
NPI 1306102520
455 OCONNOR DR STE 370
San Jose, CA 95128
(408) 827-4274
✔ PECOS✔ Accepts Medicare2.5 mi
Victor Velasco, M.D.
Obstetrics/Gynecology
NPI 1144689027
2734 EL CAMINO REAL
Santa Clara, CA 95051
(650) 934-7530
✔ PECOS✔ Accepts Medicare4.8 mi
Cici Liu, M.D.
Gynecological Oncology
NPI 1952620577
125 LATTIMORE RD STE 258
Rochester, NY 14620
(585) 442-8020
✔ PECOS✔ Accepts Medicare2,350 mi

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

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 Bay Area Gynecology Oncology Inc's NPI number?

The NPI number for Bay Area Gynecology Oncology Inc is 1891801122. It was assigned to this organization in the NPPES registry on August 21, 2006. The provider is doing business as Bay Area Gynecology Oncology.

Where is Bay Area Gynecology Oncology Inc located?

Bay Area Gynecology Oncology Inc is located at 910 Campisi Way Ste 2A, Campbell, CA 95008. The listed phone number is (408) 827-4274.

What is Bay Area Gynecology Oncology Inc's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Bay Area Gynecology Oncology Inc enrolled in Medicare?

Yes. Bay Area Gynecology Oncology Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Bay Area Gynecology Oncology Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 6 clinicians in 4 Medicare specialties reassign their Medicare billing to Bay Area Gynecology Oncology Inc. A 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 the clinician's services. The largest specialties are Obstetrics/Gynecology (3), Gynecological Oncology (1) and Surgical Oncology (1). Of these, 3 practice at this address and 5 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Bay Area Gynecology Oncology Inc was last updated on September 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.