Steven Gwiazdowski, MD
NPI 1710037684 · Neonatal-Perinatal Medicine Physician · Fairfield, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Gwiazdowski, MD is a Neonatal-Perinatal Medicine Physician provider in Fairfield, CA (NPI 1710037684).
Provider details
- NPI number
- 1710037684
- Entity type
- Individual
- Primary specialty
- Neonatal-Perinatal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G683240 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (1)
- 300 Hospital DrVallejo, CA 94589-2574Phone: (707) 554-5102
Registry dates
- Enumerated
- 2007-01-11
- Last updated
- 2025-09-19
- Certified
- 2025-09-19
Frequently asked questions
- What is Steven Gwiazdowski's NPI number?
- Steven Gwiazdowski's National Provider Identifier (NPI) is 1710037684, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Gwiazdowski's specialty?
- Steven Gwiazdowski is listed in the NPPES registry with a primary specialty of Neonatal-Perinatal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Gwiazdowski located?
- Steven Gwiazdowski's practice location on file with NPPES is 1860 Pennsylvania Ave Ste 145, Fairfield, CA 94533-3547.
- What is Steven Gwiazdowski's phone number?
- The practice phone number listed in the NPPES registry for Steven Gwiazdowski is (707) 646-4051.
- Does Steven Gwiazdowski accept Medicare?
- Steven Gwiazdowski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Gwiazdowski's NPI active?
- Yes — Steven Gwiazdowski's NPI (1710037684) is active in the NPPES registry as of the last update on 2025-09-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.