GEOFFREY ALEXANDER SONN MD
NPI 1275720351
Urology in Stanford, CA
About Geoffrey Alexander Sonn Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GEOFFREY ALEXANDER SONN MD (NPI 1275720351) is an individual urology provider in Stanford, California, licensed in California (A96537) and active in the NPI registry since October 2007. He is enrolled in Medicare PECOS and is a graduate of University Of California, Geffen School Of Medicine (2005).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Geoffrey Alexander Sonn Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 12
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94305 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Geoffrey Sonn's NPI number?
The NPI number for Geoffrey Sonn is 1275720351. It was assigned to this individual provider in the NPPES registry on October 2, 2007.
Where is Geoffrey Sonn located?
Geoffrey Sonn practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Geoffrey Sonn's specialty?
The primary specialty registered for this NPI is Urology with taxonomy code 208800000X.
Is Geoffrey Sonn enrolled in Medicare?
Yes. Geoffrey Sonn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
When was this NPI record last updated?
The NPPES record for Geoffrey Sonn was last updated on March 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Geoffrey Alexander Sonn, MD · NPI 1275720351
Urology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since October 2, 2007.
## Identity
- **NPI:** 1275720351 (Entity type: Individual)
- **Enumerated:** October 2, 2007
- **Primary specialty:** Urology · taxonomy 208800000X
- **State license:** A96537 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Medical school:** University Of California, Geffen School Of Medicine, class of 2005
## Record status
- **NPPES last updated:** March 18, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1275720351) · Data from the CMS NPPES public registry.