Quick answers
- Does Elizabeth G. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Elizabeth G. Obrien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Elizabeth G. Obrien see?
- In 2024, CMS data shows 623 Original Medicare patients and 676 services for Elizabeth G. Obrien. This counts Original Medicare only and measures volume, not quality.
- What is Elizabeth G. Obrien's NPI number?
- 1922454560. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Elizabeth G. Obrien, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 623 |
|---|---|
| Services billed to Medicare | 676 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Emergency department visit with high level of medical decision making (99285)489 services
- Critical care, first 30-74 minutes (99291)121 services
- Emergency department visit with moderate level of medical decision making (99284)33 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis61%
- Anxiety54%
- Ischemic heart disease44%
- Depression43%
Hospitals where Elizabeth G. Obrien works
Medicare's Facility Affiliation Data lists Elizabeth G. Obrien 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.
- South Shore HospitalSouth Weymouth, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220100
Practice locations
Addresses where Elizabeth G. Obrien is enrolled with Medicare (CMS data updated October 2, 2026).
- 55 Fogg RdWeymouth, MA 02190 (781) 792‑4136
Group practices
Medicare enrollment lists Elizabeth G. Obrien as a member of this group (CMS data updated October 2, 2026).
- Coastal Medical Associates443 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Weymouth
Clinicians with the same Medicare primary specialty in Weymouth, MA — not a recommendation.
Other clinicians in Coastal Medical Associates
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Yale University School Of Medicine |
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922454560 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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