Stephen Nathanson, MD.
NPI 1851310452 · Pediatrics Physician · Valencia, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Nathanson, MD. is a Pediatrics Physician provider in Valencia, CA (NPI 1851310452).
Provider details
- NPI number
- 1851310452
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD.
- Sex
- Male
- Sole proprietor
- No
- License
- A43977 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$32 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2012-10-08
Frequently asked questions
- What is Stephen Nathanson's NPI number?
- Stephen Nathanson's National Provider Identifier (NPI) is 1851310452, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Nathanson's specialty?
- Stephen Nathanson is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Nathanson located?
- Stephen Nathanson's practice location on file with NPPES is 26357 Mcbean Pkwy, Valencia, CA 91355-4488.
- What is Stephen Nathanson's phone number?
- The practice phone number listed in the NPPES registry for Stephen Nathanson is (661) 222-2620.
- Does Stephen Nathanson accept Medicare?
- Stephen Nathanson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Nathanson's NPI active?
- Yes — Stephen Nathanson's NPI (1851310452) is active in the NPPES registry as of the last update on 2012-10-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.