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ALEXANDORA EKKENS SIPORIN
NPI 1285807990
Pediatrics in Ontario, CA

Active since April 02, 2008PECOS Enrolled
955 N DUESENBERG DR, #6322, ONTARIO, CA 91764(505) 934-0860 Get Directions Write a Review

NPPES record last updated: December 1, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Alexandora Ekkens Siporin NPPES

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

ALEXANDORA EKKENS SIPORIN (NPI 1285807990) is an individual pediatrics provider in Ontario, California, licensed in California (20A11828) and active in the NPI registry since April 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1285807990
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameALEXANDORA EKKENS SIPORIN
Location Address955 N DUESENBERG DR, #6322Ontario, CA 91764-7913
Mailing Address955 N Duesenberg Dr, #6322Ontario, CA 91764-7913 · (505) 934-0860
Phone(505) 934-0860
Sole ProprietorNo
Enumeration DateApril 2, 2008
Last NPPES UpdateDecember 1, 2021
✔ NPI 1285807990 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · 20A11828
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
955 N DUESENBERG DR, Ontario, CA 91764
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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)

Alexandora Ekkens Siporin 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 Alexandora Siporin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
7.8 mi
Health Maintenance Organization
15272 SUMMIT AVE
Fontana, CA 92336
  • Reassigned Medicare billing, California enrollment
  • 5,228 clinicians in this Medicare group
NPI 1316463763 (877) 608-0044

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 91764 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
$91.88 typical visit price
range $59.60 – $179.42
Typical copayment $22.97 (range $14.90 – $44.85)
Most-billed visit code 99203
Established Patient
$104.64 typical visit price
range $19.37 – $146.42
Typical copayment $26.16 (range $4.84 – $36.60)
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.

Other Providers at the Same Location NPPES

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

DR. YOHANNES D ABRAHAM PHARM.D
Pharmacist
955 N DUESENBERG DR, UNIT 7201
ONTARIO, CA 91764
San Bernardino County (909) 561-8262

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 Alexandora Siporin's NPI number?

The NPI number for Alexandora Siporin is 1285807990. It was assigned to this individual provider in the NPPES registry on April 2, 2008.

Where is Alexandora Siporin located?

Alexandora Siporin practices at 955 N Duesenberg Dr #6322, Ontario, CA 91764. The listed phone number is (505) 934-0860.

What is Alexandora Siporin's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Alexandora Siporin enrolled in Medicare?

Yes. Alexandora Siporin is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Alexandora Siporin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexandora Siporin reassigns Medicare benefits to Southern California Permanente Medical Group (Fontana, 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 Alexandora Siporin'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 Alexandora Siporin was last updated on December 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.