Quick answers
- Which hospitals does Brian J. Keyashian work at?
- Medicare's official clinician data lists Brian J. Keyashian at 5 hospitals: Alta Bates Summit Medical Center, Alta Bates Summit Medical Center - Alta Bates Camp…, Contra Costa Regional Medical Center, John Muir Medical Center - Concord Campus and John Muir Medical Center - Walnut Creek Campus. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Brian J. Keyashian see patients?
- Medicare's clinician data lists 6 practice locations, including Alamo, CA, Antioch, CA and Walnut Creek, CA. Call before your visit to confirm the address.
- What is Brian J. Keyashian's specialty?
- Medicare lists Vascular Surgery as the primary specialty.
- Does Brian J. Keyashian accept Medicare assignment?
- Yes. Medicare's clinician data says Brian J. Keyashian 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 Brian J. Keyashian?
- (925) 932-6330, as listed in official Medicare / NPI Registry data.
- What is Brian J. Keyashian's NPI number?
- 1962776245. 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 J. Keyashian works
Medicare's Facility Affiliation Data lists Brian J. Keyashian at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · CCN 050043
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
- Contra Costa Regional Medical CenterMartinez, CA · Acute Care Hospital · CCN 050276
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
Practice locations
Addresses where Brian J. Keyashian is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1505 Saint Alphonsus WayAlamo, CA 94507 (925) 932‑6330
- 2350 Country Hills DrAntioch, CA 94509
- 2637 Shadelands DrWalnut Creek, CA 94598
- 350 30th St, Suite 210Oakland, CA 94609 (510) 832‑6131
- 365 Lennon LnWalnut Creek, CA 94598
Group practices
Medicare enrollment lists Brian J. Keyashian as a member of this group (CMS data updated 2026-10-02).
- Bass Medical Group291 clinicians in the group
Specialties
- Vascular Surgeryprimary
Other vascular surgeons in Alamo
Clinicians with the same Medicare primary specialty in Alamo, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962776245 |
| 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