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STEPHEN M NATHANSON MD.
NPI 1851310452
Pediatrics in Valencia, CA

Active since July 18, 2006PECOS Enrolled
26357 MCBEAN PKWY, VALENCIA, CA 91355(661) 222-2620(661) 222-2685 Get Directions Write a Review

NPPES record last updated: October 8, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Stephen M Nathanson Md. NPPES

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

STEPHEN M NATHANSON MD. (NPI 1851310452) is an individual pediatrics provider in Valencia, California, licensed in California (A43977) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1851310452
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameSTEPHEN M NATHANSONCredential: MD.
Location Address26357 MCBEAN PKWYValencia, CA 91355-4488
Mailing AddressPo Box 9602Mission Hills, CA 91346-9602 · (818) 837-5637 · Fax (818) 837-5589
Phone(661) 222-2620
Fax(661) 222-2685
Sole ProprietorNo
Enumeration DateJuly 18, 2006
Last NPPES UpdateOctober 8, 2012
✔ NPI 1851310452 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · A43977
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.
26357 MCBEAN PKWY, Valencia, CA 91355
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Other Identifiers 3

Medicare UPINE73283CA
Medicaid00A439770CA
Medicare PINA0360PCA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stephen M Nathanson Md. 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 Stephen Nathanson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Providence Facey Medical Foundation
Same address
Internal Medicine
26357 MCBEAN PKWY
Valencia, CA 91355
  • Reassigned Medicare billing, California enrollment
  • 684 clinicians in this Medicare group
NPI 1710031588 (661) 222-2600

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 91355 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

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.

AROUSHA DAVATGARZADEH M.D.
Internal Medicine
26357 MCBEAN PKWY
VALENCIA, CA 91355
Los Angeles County (661) 222-2605
DR. ROBERT WAYNE MOWER D.D.S.
Dentist (Oral and Maxillofacial Surgery)
26357 MCBEAN PKWY, SUITE 255
VALENCIA, CA 91355
Los Angeles County (661) 255-1515
DAVID M LANUM DPT
Physical Therapist
26357 MCBEAN PKWY, STE 220
SANTA CLARITA, CA 91355
Los Angeles County (661) 254-0077
DEEPTHI KARANAM M.D.
Internal Medicine
26357 MCBEAN PKWY
VALENCIA, CA 91355
Los Angeles County (661) 222-2600
HASAN MURAD CHOWDHURY M.D.
Pediatrics
26357 MCBEAN PKWY
VALENCIA, CA 91355
Los Angeles County (661) 222-2620
MIKE SAGUIBO
Physical Therapist
26357 MCBEAN PKWY, 220
SANTA CLARITA, CA 91355
Los Angeles County (661) 254-0077
ALYSCIA MIRIAM CHEEMA MD
Family Medicine
26357 MCBEAN PKWY
VALENCIA, CA 91355
Los Angeles County (818) 466-7506
BELINDA G ROUSE N.P.
Nurse Practitioner
26357 MCBEAN PKWY
VALENCIA, CA 91355
Los Angeles County (661) 222-2658

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 Stephen Nathanson's NPI number?

The NPI number for Stephen Nathanson is 1851310452. It was assigned to this individual provider in the NPPES registry on July 18, 2006.

Where is Stephen Nathanson located?

Stephen Nathanson practices at 26357 Mcbean Pkwy, Valencia, CA 91355. The listed phone number is (661) 222-2620.

What is Stephen Nathanson's specialty?

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

Is Stephen Nathanson enrolled in Medicare?

Yes. Stephen Nathanson is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Stephen Nathanson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Nathanson reassigns Medicare benefits to Providence Facey Medical Foundation (Valencia, 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 Stephen Nathanson'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 Stephen Nathanson was last updated on October 8, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.