Quick answers
- Which hospitals does Patrick W. O'Brien work at?
- Medicare's official clinician data lists Patrick W. O'Brien at 1 hospital: Mercy Medical Ctr. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Patrick W. O'Brien see patients?
- Medicare's clinician data lists 3 practice locations, including Springfield, MA. Call before your visit to confirm the address.
- What is Patrick W. O'Brien's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Patrick W. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Patrick W. O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Patrick W. O'Brien?
- (413) 748-9212, as listed in official Medicare / NPI Registry data.
- What is Patrick W. O'Brien's NPI number?
- 1134577141. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Patrick W. O'Brien works
Medicare's Facility Affiliation Data lists Patrick W. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Medical CtrSpringfield, MA · Acute Care Hospital · CCN 220066
Practice locations
Addresses where Patrick W. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 233 Carew StSpringfield, MA 01104 (413) 748‑9212
- 271 Carew StSpringfield, MA 01104 (413) 452‑6251
- 401 Chestnut StSpringfield, MA 01104 (413) 452‑6251
Group practices
Medicare enrollment lists Patrick W. O'Brien as a member of these groups (CMS data updated 2026-10-02).
- Riverbend Medical Group Inc226 clinicians in the group
- SC Orthopedics of New England, PC.10 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Springfield
Clinicians with the same Medicare primary specialty in Springfield, MA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134577141 |
| Corrections | Report 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians