Steven G. Gwiazdowski, MD
Neonatal-Perinatal Medicine Physician · Fairfield, CA
Steven G. Gwiazdowski, MD is a neonatal-perinatal medicine physician with a practice address in Fairfield, California, and NPI 1710037684, issued on Jan 11, 2007. Check the license (California G683240, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Steven G. Gwiazdowski
- Credential
- MD
- Primary taxonomy
- Neonatal-Perinatal Medicine Physician 2080N0001X
- License number
- G683240 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1860 Pennsylvania Ave Ste 145, Fairfield, CA 94533
- Phone
- (707) 646-4051
- Enumerated
- Jan 11, 2007
- Record last updated
- Sep 19, 2025
- Fax
- (707) 646-5323
- Medicaid ID
- GR0040030 CA
- Medicare enrollment
- Enrolled (PECOS I20251003003445); may accept Medicare assignment
- Medical or professional school
- Virginia Commonwealth University, School Of Medicine, 1985
- Entity
- Type 1 · individual
8 nearest neonatal-perinatal medicine physician records → All 871 in California → Look up another NPI →
Also registered at 1860 Pennsylvania Ave Ste 145
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maika Manalastas, DONeonatal-Perinatal Medicine Physician1144615881
Verify Steven G. Gwiazdowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G683240Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Steven G. Gwiazdowski among 871 neonatal-perinatal medicine physician records in California
Steven G. Gwiazdowski, MD is one of 871 neonatal-perinatal medicine physician records with a practice address in California. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 36% newer
- In a Medicare fileNo · 15% of these records are
- In the CMS Doctors and Clinicians fileYes · 7% of these records are
- Graduated1985 · median 2012 among the 61 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080N0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neonatal-Perinatal Medicine Physician providers in California
There are 871 neonatal-perinatal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 871 in California → Every provider in Fairfield → Neonatal-Perinatal Medicine Physician nationwide →
The 8 neonatal-perinatal medicine physician records with the nearest ZIP codes
- Maika Manalastas, DOFairfield, CA 945331144615881
- Brian Montenegro, MDFairfield, CA 945331194871376
- Stephen Golden, M.D.Travis Air Force Base, CA 945351649264136
- Maha Amr, M.DAntioch, CA 945091962514141
- Berenice Ku, M.D.San Leandro, CA 945771144392952
- Ashvin Sangoram, M.D. PHDSan Leandro, CA 945771952508376
- Cynthia Wikler, M.D.San Leandro, CA 945771215016365
- Richard Bell, MDVallejo, CA 945891922161298
Common questions
What is Steven G. Gwiazdowski, MD's NPI number?
Steven G. Gwiazdowski, MD's National Provider Identifier (NPI) is 1710037684, issued on Jan 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Steven G. Gwiazdowski, MD located?
The NPPES record lists a practice address at 1860 Pennsylvania Ave Ste 145, Fairfield, CA, 94533. Phone: (707) 646-4051. Providers update this record themselves, so call before visiting.
How can I verify Steven G. Gwiazdowski, MD's license?
NPPES lists California license number G683240, 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. 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.