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Physician Assistant

Gwyneth Kelleher

Works at hospitals in Springfield, MA · Palmer, MA · Massachusetts

Summary

Gwyneth Kelleher is a physician assistant at 3480 E Guasti Rd, Ontario, CA 91761. May accept Medicare assignment. NPI 1578253878. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026.

NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Gwyneth Kelleher, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Gwyneth Kelleher accept Medicare assignment?
Medicare's clinician data says Gwyneth Kelleher may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
What is Gwyneth Kelleher's NPI number?
1578253878. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Hospitals where Gwyneth Kelleher works

Medicare's Facility Affiliation Data lists Gwyneth Kelleher at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

  • Baystate Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220077
  • Baystate Wing HospitalPalmer, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220030

Practice locations

Addresses where Gwyneth Kelleher is enrolled with Medicare (CMS data updated October 2, 2026).

  • 3480 E Guasti RdOntario, CA 91761

Specialties

Find other clinicians: Physician Assistant, California →

Other physician assistants in Ontario

Clinicians with the same Medicare primary specialty in Ontario, CA — not a recommendation.

All physician assistants in Ontario →

Clinician information

Graduation year2023
Gender (as listed)Female
Medicare assignmentMay accept for some services
NPI (National Provider Identifier)1578253878
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  5. Medicare Care Compare — official Medicare tool to look up clinicians