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STEVEN G GWIAZDOWSKI MD
NPI 1710037684
Pediatrics - Neonatal-Perinatal Medicine in Fairfield, CA

Active since January 11, 2007PECOS Enrolled
1860 PENNSYLVANIA AVE STE 145, FAIRFIELD, CA 94533(707) 646-4051(707) 646-5323 Get Directions Write a Review

NPPES record last updated: September 19, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Steven G Gwiazdowski Md NPPES

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

STEVEN G GWIAZDOWSKI MD (NPI 1710037684) is an individual neonatal-perinatal medicine provider in Fairfield, California, licensed in California (G683240) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in Vallejo, and is a graduate of Virginia Commonwealth University, School Of Medicine (1985).

NPPES Registry Identity

NPI1710037684
Entity TypeIndividualMale
Primary Taxonomy2080N0001X
Provider Legal NameSTEVEN G GWIAZDOWSKICredential: MD
Location Address1860 PENNSYLVANIA AVE STE 145Fairfield, CA 94533-3547
Mailing Address1860 Pennsylvania Ave Ste 145Fairfield, CA 94533-3547 · (707) 429-6908 · Fax (707) 429-6906
Phone(707) 646-4051
Fax(707) 646-5323
Sole ProprietorNo
Medical School CMSVirginia Commonwealth University, School Of MedicineGraduated 1985
Enumeration DateJanuary 11, 2007
Last NPPES UpdateSeptember 19, 2025
NPPES CertifiedSeptember 19, 2025
✔ NPI 1710037684 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Neonatal-Perinatal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080N0001X
License✔ Licensed in CA · G683240
Definition
A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.
1860 PENNSYLVANIA AVE STE 145, Fairfield, CA 94533
Open in Google Maps ↗

Secondary Practice Location 1

Location 1300 Hospital DrVallejo, CA 94589-2574 · Phone (707) 554-5102

Other Identifiers 1

MedicaidGR0040030CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Steven G Gwiazdowski Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID9830086875
PECOS Enrollment IDI20251003003445
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 Reassignments

3

Medicare enrollment records show Steven Gwiazdowski reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of California San Francisco
41 mi
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
41 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808
Ucsf Pediatrics Associates
41 mi
Pediatrics
505 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 1,159 clinicians in this Medicare group
NPI 1376614016 (415) 353-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES

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

MAIKA MANALASTAS DO
Pediatrics (Neonatal-Perinatal Medicine)
1860 PENNSYLVANIA AVE STE 145
FAIRFIELD, CA 94533
Solano County (707) 646-4051

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 Steven Gwiazdowski's NPI number?

The NPI number for Steven Gwiazdowski is 1710037684. It was assigned to this individual provider in the NPPES registry on January 11, 2007.

Where is Steven Gwiazdowski located?

Steven Gwiazdowski practices at 1860 Pennsylvania Ave Ste 145, Fairfield, CA 94533. The listed phone number is (707) 646-4051.

What is Steven Gwiazdowski's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Is Steven Gwiazdowski enrolled in Medicare?

Yes. Steven Gwiazdowski is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Steven Gwiazdowski's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Steven Gwiazdowski reassigns Medicare benefits to 3 organizations: University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Ucsf Pediatrics Associates (San Francisco, CA). Each 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 Steven Gwiazdowski'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 Steven Gwiazdowski was last updated on September 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.