Quick answers
- Which hospitals does Geoffrey A. Sonn work at?
- Medicare's official clinician data lists Geoffrey A. Sonn at 3 hospitals: Community Hospital of the Monterey Peninsula, Stanford Health Care and Stanford Health Care Tri-Valley. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Geoffrey A. Sonn see patients?
- Medicare's clinician data lists 1 practice location in Stanford, CA. Call before your visit to confirm the address.
- What is Geoffrey A. Sonn's specialty?
- Medicare lists Urology as the primary specialty, and also General Surgery.
- Does Geoffrey A. Sonn accept Medicare assignment?
- Yes. Medicare's clinician data says Geoffrey A. Sonn 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 Geoffrey A. Sonn offer telehealth?
- Medicare's clinician data says Geoffrey A. Sonn offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Geoffrey A. Sonn?
- (650) 723-4000, as listed in official Medicare / NPI Registry data.
- What is Geoffrey A. Sonn's NPI number?
- 1275720351. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Geoffrey A. Sonn works
Medicare's Facility Affiliation Data lists Geoffrey A. Sonn 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
- Stanford Health CareStanford, CA · Acute Care Hospital · CCN 050441
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · CCN 050283
Practice locations
Addresses where Geoffrey A. Sonn is enrolled with Medicare (CMS data updated 2026-10-02).
- 300 Pasteur DrStanford, CA 94305 (650) 723‑4000
Group practices
Medicare enrollment lists Geoffrey A. Sonn as a member of this group (CMS data updated 2026-10-02).
- Stanford Health Care3,122 clinicians in the group
Specialties
- Urologyprimary
- General Surgeryalso
Other urologists in Stanford
Clinicians with the same Medicare primary specialty in Stanford, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1275720351 |
| 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