NPI Lens

William Robert Mathias, PA-C

NPI 1285806323ActiveIndividual· Physician Assistant· San Marcos, CA

Physician Assistant (PA-C) with Neighborhood Healthcare, practicing in San Marcos, California. Part D covered 337 prescriptions written in 2024, 84% of them generic. Viiv Healthcare Company was the largest of 2 companies reporting payments in 2025, $45.72 in all, mostly food and beverage.

Overview

NPI1285806323
StatusActive
Entity typeIndividual
CredentialPA-C
Sole proprietorNo
NPI issuedMar 28, 2008
Last updated in NPPESMar 28, 2023
Certified by providerMar 28, 2023

Specialties and licenses

TaxonomyCodeLicenseState
Physician Assistant Primary363A00000X59627CA
Physician Assistant363A00000X085.004666IL

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Oct 9, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026No match—
New York OMIG · Nov 10, 2026No match—
Ohio Medicaid · Nov 10, 2026No match—
Pennsylvania Medicheck · Nov 10, 2026No match—
Washington HCA · Nov 10, 2026No match—

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

Medicare

Enrollment (PECOS)Enrolled Practitioner - Physician Assistant (CA)

Part D prescriptions in 2024

Prescriptions (claims)337 · 657 30-day fills
Patients114
Total drug cost$51,601
Generic share84% of claims

Medicare sources and data years

Education and affiliations

Graduation year2022
Medicare specialtyPhysician Assistant

Medical group

Source: CMS Care Compare

Industry payments (Open Payments)

  • 2025$45.72 · 2 payments from 2 companies
  • 2024$223.91 · 9 payments from 7 companies

Top paying companies in 2025

CompanyAmountPayments
Viiv Healthcare Company$28.961
Hologic Sales and Service, LLC$16.761

What the 2025 payments were for

  • Food and Beverage$45.72 · 2 payments

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

Other Physician Assistant providers in San Marcos

All Physician Assistant providers in California →