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MARY ELIZABETH ABUSIEF M.D.
NPI 1639206733
Obstetrics & Gynecology - Reproductive Endocrinology in East Palo Alto, CA

Active since February 27, 2007PECOS EnrolledAccepts Medicare Assignment
1950 UNIVERSITY AVE STE 170, EAST PALO ALTO, CA 94303(650) 322-1900 Get Directions Write a Review

NPPES record last updated: May 28, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 28, 2020, Apr 9, 2019, Jun 27, 2017 (3 updates tracked since 2017).

About Mary Elizabeth Abusief M.d. NPPES

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

MARY ELIZABETH ABUSIEF M.D. (NPI 1639206733) is an individual reproductive endocrinology provider in East Palo Alto, California, licensed in California (A100071) and active in the NPI registry since February 2007. She is enrolled in Medicare PECOS and is a graduate of Southern Illinois University School Of Medicine (2000).

NPPES Registry Identity

NPI1639206733
Entity TypeIndividualFemale
Primary Taxonomy207VE0102X
Provider Legal NameMARY ELIZABETH ABUSIEFCredential: M.D.
Location Address1950 UNIVERSITY AVE STE 170East Palo Alto, CA 94303-2289
Mailing Address325 Distel CirLos Altos, CA 94022-1408 · (800) 597-2234
Phone(650) 322-1900
Sole ProprietorNo
Medical School CMSSouthern Illinois University School Of MedicineGraduated 2000
Enumeration DateFebruary 27, 2007
Last NPPES UpdateMay 28, 20203 updates tracked since enumeration
NPPES CertifiedMay 28, 2020
✔ NPI 1639206733 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Reproductive EndocrinologyAllopathic & Osteopathic Physicians
Taxonomy Code207VE0102X
Licenses✔ Licensed in CA · A100071✔ Licensed in MA · 221426
Definition
An obstetrician/gynecologist who is capable of managing complex problems relating to reproductive endocrinology and infertility.
1950 UNIVERSITY AVE STE 170, East Palo Alto, CA 94303
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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 and accepts Medicare assignment

Mary Elizabeth Abusief M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9830408723
PECOS Enrollment IDI20151015001011
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 Mary Abusief reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sutter Bay Medical Foundation
1.8 mi
Multi-Specialty
795 EL CAMINO REAL
Palo Alto, CA 94301
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1104067115 (California)
  • 4,479 clinicians in this Medicare group
NPI 1013950807 (650) 321-4121

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 94303 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
$121.77 typical visit price
range $23.96 – $169.60
Typical copayment $30.44 (range $5.99 – $42.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Mary Abusief's NPI number?

The NPI number for Mary Abusief is 1639206733. It was assigned to this individual provider in the NPPES registry on February 27, 2007.

Where is Mary Abusief located?

Mary Abusief practices at 1950 University Ave Ste 170, East Palo Alto, CA 94303. The listed phone number is (650) 322-1900.

What is Mary Abusief's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Reproductive Endocrinology, with taxonomy code 207VE0102X.

Is Mary Abusief enrolled in Medicare?

Yes. Mary Abusief is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Mary Abusief's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Abusief reassigns Medicare benefits to Sutter Bay Medical Foundation (Palo Alto, 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 Mary Abusief'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 Mary Abusief was last updated on May 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.