Quick answers
- Which hospitals does Brian Sebastian work at?
- Medicare's official clinician data lists Brian Sebastian at 5 hospitals: Marinhealth Medical Center, Providence Queen of the Valley Medical Center, Providence Santa Rosa Memorial Hospital, Sonoma Valley Hospital and UCSF Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Brian Sebastian see patients?
- Medicare's clinician data lists 1 practice location in San Francisco, CA. Call before your visit to confirm the address.
- What is Brian Sebastian's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Brian Sebastian accept Medicare assignment?
- Medicare's clinician data says Brian Sebastian may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Brian Sebastian offer telehealth?
- Medicare's clinician data says Brian Sebastian offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Brian Sebastian?
- (415) 476-1000, as listed in official Medicare / NPI Registry data.
- What is Brian Sebastian's NPI number?
- 1184624637. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Brian Sebastian works
Medicare's Facility Affiliation Data lists Brian Sebastian at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Marinhealth Medical CenterGreenbrae, CA · Acute Care Hospital · CCN 050360
- Providence Queen of the Valley Medical CenterNapa, CA · Acute Care Hospital · CCN 050009
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA · Acute Care Hospital · CCN 050174
- Sonoma Valley HospitalSonoma, CA · Acute Care Hospital · CCN 050090
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
Practice locations
Addresses where Brian Sebastian is enrolled with Medicare (CMS data updated 2026-10-02).
- 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000
Group practices
Medicare enrollment lists Brian Sebastian as a member of this group (CMS data updated 2026-10-02).
- Regents Univ of California UCSF283 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184624637 |
| 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