Quick answers
- Which hospitals does William J. Obrien work at?
- Medicare's official clinician data lists William J. Obrien at 3 hospitals: Cleveland Clinic, Hillcrest Hospital and Marymount Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William J. Obrien see patients?
- Medicare's clinician data lists 7 practice locations, including Cleveland, OH, Mayfield Heights, OH and Mentor, OH. Call before your visit to confirm the address.
- What is William J. Obrien's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does William J. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Obrien 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.
- Does William J. Obrien offer telehealth?
- Medicare's clinician data says William J. Obrien offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William J. Obrien?
- (440) 461-6430, as listed in official Medicare / NPI Registry data.
- What is William J. Obrien's NPI number?
- 1477581395. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William J. Obrien works
Medicare's Facility Affiliation Data lists William J. Obrien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cleveland ClinicCleveland, OH · Acute Care Hospital · CCN 360180
- Hillcrest HospitalMayfield Heights, OH · Acute Care Hospital · CCN 360230
- Marymount HospitalGarfield Heights, OH · Acute Care Hospital · CCN 360143
Practice locations
Addresses where William J. Obrien is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 6770 Mayfield RdCleveland, OH 44124 (440) 461‑6430
- 6770 Mayfield RdMayfield Heights, OH 44124
- 6780 Mayfield RdMayfield Heights, OH 44124
- 8300 Norton PkwyMentor, OH 44060 (216) 444‑2200
- 8701 Darrow RdTwinsburg, OH 44087 (330) 888‑4000
Group practices
Medicare enrollment lists William J. Obrien as a member of this group (CMS data updated 2026-10-02).
- Cleveland Clinic7,090 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Cleveland
Clinicians with the same Medicare primary specialty in Cleveland, OH — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1477581395 |
| 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