Quick answers
- Which hospitals does Connor G. O'Brien work at?
- Medicare's official clinician data lists Connor G. O'Brien at 5 hospitals: Community Hospital of the Monterey Peninsula, Marinhealth Medical Center, Salinas Valley Health Medical Center, UCSF Health St. Mary's Hospital and UCSF Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Connor G. O'Brien see patients?
- Medicare's clinician data lists 2 practice locations, including San Francisco, CA. Call before your visit to confirm the address.
- What is Connor G. O'Brien's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Connor G. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Connor G. 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 Connor G. O'Brien?
- (415) 476-4029, as listed in official Medicare / NPI Registry data.
- What is Connor G. O'Brien's NPI number?
- 1063788727. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Connor G. O'Brien works
Medicare's Facility Affiliation Data lists Connor G. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Community Hospital of the Monterey PeninsulaMonterey, CA · Acute Care Hospital · CCN 050145
- Marinhealth Medical CenterGreenbrae, CA · Acute Care Hospital · CCN 050360
- Salinas Valley Health Medical CenterSalinas, CA · Acute Care Hospital · CCN 050334
- UCSF Health St. Mary's HospitalSan Francisco, CA · Acute Care Hospital · CCN 050457
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
Practice locations
Addresses where Connor G. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 1701 Divisadero StSan Francisco, CA 94115 (415) 476‑4029
- 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000
Group practices
Medicare enrollment lists Connor G. O'Brien as a member of these groups (CMS data updated 2026-10-02).
- Regents of the University of California732 clinicians in the group
- University Anesthesia Medical Group408 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1063788727 |
| 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