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XI DU PLUMMER MD, PHD
NPI 1396205373
Obstetrics & Gynecology - Maternal & Fetal Medicine in Palo Alto, CA

Active since March 25, 2019PECOS Enrolled
725 WELCH RD, PALO ALTO, CA 94304(650) 497-8000 Get Directions Write a Review

NPPES record last updated: July 21, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 21, 2026, Jul 24, 2023, May 29, 2023 (3 updates tracked since 2023).

About Xi Du Plummer Md, Phd NPPES

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

XI DU PLUMMER MD, PHD (NPI 1396205373) is an individual maternal & fetal medicine provider in Palo Alto, California, licensed in California (A186616) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS, maintains a secondary practice location in Palo Alto, and is a graduate of University Of Michigan Medical School (2019).

NPPES Registry Identity

NPI1396205373
Entity TypeIndividualFemale
Primary Taxonomy207VM0101X
Provider Legal NameXI DU PLUMMERCredential: MD, PHD
Location Address725 WELCH RDPalo Alto, CA 94304-1601
Mailing Address725 Welch RdPalo Alto, CA 94304-1601 · (650) 497-8000
Phone(650) 497-8000
Sole ProprietorYes
Medical School CMSUniversity Of Michigan Medical SchoolGraduated 2019
Enumeration DateMarch 25, 2019
Last NPPES UpdateJuly 21, 20263 updates tracked since enumeration
NPPES CertifiedJuly 21, 2026
✔ NPI 1396205373 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207VM0101X
License✔ Licensed in CA · A186616
Definition
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.
Also ListedObstetrics & GynecologyTaxonomy 207V00000X · License A186616 (CA)
Also ListedObstetrics & Gynecology · ObstetricsTaxonomy 207VX0000X · License A186616 (CA)
725 WELCH RD, Palo Alto, CA 94304
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Secondary Practice Location 1

Location 1453 Quarry Road, 4th Floor, Department of OB/GYNPalo Alto, CA 94304 · Phone (650) 725-8623

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Xi Du Plummer Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID8022344316
PECOS Enrollment IDI20260611004098
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 Xi Plummer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Lpch Medical Group Div Of Lucile
Same address
Children
725 WELCH RD
Palo Alto, CA 94304
  • Reassigned Medicare billing, California enrollment
  • 3,617 clinicians in this Medicare group
NPI 1417907940 (650) 498-6762
Stanford Health Care
0.2 mi
General Acute Care Hospital
300 PASTEUR DRIVE
Stanford, CA 94305
  • Reassigned Medicare billing, California enrollment
  • 4,258 clinicians in this Medicare group
NPI 1437292927 (650) 723-4000

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 94304 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 20

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

EIRI INENAGA MS, OTR/L
Occupational Therapist (Pediatrics)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8218
WENDY LEIGH ADAMS ARNP
Nurse Practitioner (Neonatal)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KEVIN WEI-HAN CHI MD
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
ASHEEN RAMA MD
Anesthesiology (Pediatric Anesthesiology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
CRYSTAL LEE MACKALL MD
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KRISTI LYNNE O'CONNOR OT
Occupational Therapist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
LAUREN GENNA ROOS NP
Nurse Practitioner
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
SHALINI MITTAL MD
Hospitalist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000

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 Xi Plummer's NPI number?

The NPI number for Xi Plummer is 1396205373. It was assigned to this individual provider in the NPPES registry on March 25, 2019.

Where is Xi Plummer located?

Xi Plummer practices at 725 Welch Rd, Palo Alto, CA 94304. The listed phone number is (650) 497-8000.

What is Xi Plummer's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Is Xi Plummer enrolled in Medicare?

Yes. Xi Plummer is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Xi Plummer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Xi Plummer reassigns Medicare benefits to 2 organizations: Lpch Medical Group Div Of Lucile (Palo Alto, CA) and Stanford Health Care (Stanford, 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 Xi Plummer'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 Xi Plummer was last updated on July 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.