NPI Lens

Brian James Vierra, MD

NPI 1659483154ActiveIndividual· Obstetrics & Gynecology· Merced, CA

Obstetrics & Gynecology (MD) in Merced, California, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1987). In 2024 Medicare paid $13,766 for 77 patients, and Part D covered 118 of their prescriptions, 89% of them generic.

Overview

NPI1659483154
StatusActive
Entity typeIndividual
CredentialMD
Sole proprietorNo
NPI issuedAug 31, 2006
Last updated in NPPESDec 11, 2020
Certified by providerDec 11, 2020

Specialties and licenses

TaxonomyCodeLicenseState
Obstetrics & Gynecology Primary207V00000XG70901CA

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Nov 10, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026No match—
New York OMIG · Nov 11, 2026No match—
Ohio Medicaid · Nov 11, 2026No match—
Pennsylvania Medicheck · Nov 11, 2026No match—
Washington HCA · Nov 11, 2026No match—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)Enrolled Practitioner - Obstetrics/Gynecology (CA)
Accepts assignmentYes (participating)

Medicare services in 2024

Medicare patients77
Services billed226 across 25 procedure codes
Paid by Medicare$13,766

Part D prescriptions in 2024

Prescriptions (claims)118 · 271 30-day fills
Patients41
Total drug cost$7,544
Generic share89% of claims

Medicare sources and data years

Education and affiliations

Medical schoolLoyola University of Chicago, Stritch School of Medicine
Graduation year1987
Medicare specialtyObstetrics/Gynecology

Medical group

Hospital affiliation

Source: CMS Care Compare

Industry payments (Open Payments)

None reported for 2025 or 2024.

Receiving payments does not imply wrongdoing. What Open Payments covers ·original records

Other OB-GYNs in Merced

All 16 OB-GYNs in Merced · All OB-GYNs in California