Stephen M. Nathanson, MD.
Pediatrics Physician · Valencia, CA
Stephen M. Nathanson, MD. is a pediatrics physician with a practice address in Valencia, California, and NPI 1851310452, issued on Jul 18, 2006. Check the license (California A43977, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen M. Nathanson
- Credential
- MD.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- A43977 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26357 Mcbean Pkwy, Valencia, CA 91355
- Phone
- (661) 222-2620
- Enumerated
- Jul 18, 2006
- Record last updated
- Oct 8, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (661) 222-2685
- Medicaid ID
- 00A439770 CA
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 26357 Mcbean Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stephen M. Nathanson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A43977Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $31.76
1 payment: food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 21,580 providers of this specialty with any payment received $842.05 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Stephen M. Nathanson among 9,272 pediatrics physician records in California
Stephen M. Nathanson, MD. is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 56% newer
- In a Medicare fileYes · 31% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2012 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatrics Physician providers in California
There are 9,272 pediatrics physician records in California.
All 9,272 in California → Every provider in Valencia → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Adrienne Altman, M.D.Valencia, CA 913551447384490
- Michelle Campana, M.D.Valencia, CA 913551003075714
- Hasan Chowdhury, M.D.Valencia, CA 913551114945235
- Pamela Colby, M.D.Valencia, CA 913551629009188
- Amy Cooper, MD/MPHValencia, CA 913551366602138
- Harris Greenwald, M.D.Valencia, CA 913551760546675
- Daphne Horowitz, MDValencia, CA 913551841357183
- Peter Kim, M.D.Valencia, CA 913551467477638
Common questions
What is Stephen M. Nathanson, MD.'s NPI number?
Stephen M. Nathanson, MD.'s National Provider Identifier (NPI) is 1851310452, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen M. Nathanson, MD. located?
The NPPES record lists a practice address at 26357 Mcbean Pkwy, Valencia, CA, 91355. Phone: (661) 222-2620. Providers update this record themselves, so call before visiting.
How can I verify Stephen M. Nathanson, MD.'s license?
NPPES lists California license number A43977, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.