Quick answers
- Which hospitals does Daniel P. O'Brien work at?
- Medicare's official clinician data lists Daniel P. O'Brien at 1 hospital: Milford Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Daniel P. O'Brien see patients?
- Medicare's clinician data lists 8 practice locations, including Hopkinton, MA, Northbridge, MA and Milford, MA. Call before your visit to confirm the address.
- What is Daniel P. O'Brien's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Daniel P. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Daniel P. 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 Daniel P. O'Brien?
- (508) 435-5936, as listed in official Medicare / NPI Registry data.
- What is Daniel P. O'Brien's NPI number?
- 1689284366. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Daniel P. O'Brien works
Medicare's Facility Affiliation Data lists Daniel P. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Milford Regional Medical CenterMilford, MA · Acute Care Hospital · CCN 220090
Practice locations
Addresses where Daniel P. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1 Lumber StHopkinton, MA 01748 (508) 435‑5936
- 100 Commerce DrNorthbridge, MA 01534 (508) 234‑6311
- 100 Medway RdMilford, MA 01757
- 1280 W Central StFranklin, MA 02038
- 129 S Main StMilford, MA 01757 (774) 462‑3339
Group practices
Medicare enrollment lists Daniel P. O'Brien as a member of these groups (CMS data updated 2026-10-02).
- UMass Memorial Medical Group Inc2,516 clinicians in the group
- Milford Regional Physician Group, Inc.210 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Hopkinton
Clinicians with the same Medicare primary specialty in Hopkinton, MA — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689284366 |
| 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