Quick answers
- Does Sean M. O'Hara accept Medicare assignment?
- Yes. Medicare's clinician data says Sean M. O'Hara 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 Sean M. O'Hara see?
- In 2024, CMS data shows 653 Original Medicare patients and 866 services for Sean M. O'Hara. This counts Original Medicare only and measures volume, not quality.
- What is Sean M. O'Hara's NPI number?
- 1023429370. 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 Sean M. O'Hara, 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 | 653 |
|---|---|
| Services billed to Medicare | 866 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Emergency department visit with high level of medical decision making (99285)347 services
- Emergency department visit with moderate level of medical decision making (99284)160 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)69 services
- Emergency department visit with low level of medical decision making (99283)51 services
- Initial hospital care with same-day admission and discharge with high level of medical decision making, per day, if using time, at least 85 minutes (99236)35 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%
- Arthritis53%
- Anxiety50%
- Depression49%
- Ischemic heart disease47%
Hospitals where Sean M. O'Hara works
Medicare's Facility Affiliation Data lists Sean M. O'Hara 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.
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220071
- Merrimack Health Lawrence HospitalLawrence, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220010
- North Shore Medical Center -Salem, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220035
Practice locations
Addresses where Sean M. O'Hara is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 General StLawrence, MA 01841
- 55 Fruit StBoston, MA 02114 (617) 724‑0287
- 81 Highland AveSalem, MA 01970 (978) 354‑2551
Group practices
Medicare enrollment lists Sean M. O'Hara as a member of these groups (CMS data updated October 2, 2026).
- Massachusetts General Physicians Organization Inc3,558 clinicians in the group
- Mass General Brigham Medical Group Northern Massachusetts Inc827 clinicians in the group
- Lawrence General Hospital123 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Lawrence
Clinicians with the same Medicare primary specialty in Lawrence, MA — not a recommendation.
Other clinicians in Massachusetts General Physicians Organization Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023429370 |
| 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