Dr. Ryan R. Sun, MD
Urology (Urology Physician)
300 Pasteur Dr
Stanford, CA 94305
Who else practices at this address →
Santa Clara County includes mental health (13% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of Toronto, Faculty of Medicine (2017)
- Years since graduation
- 9
- In the NPI registry since
- 2022
- Medicare patients seen, 2024
- 393
Licensed in California since 2022, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2017Medical school: University of Toronto, Faculty of Medicine
- 2022Registered with an NPI (national billing number; not a license date)
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Urology Physician primary
CA license A177263 (first issued 2022; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Stanford Health Care Stanford, CA
- Stanford Health Care Tri-Valley Pleasanton, CA
Medical groups
- Stanford Health Care (3,122 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 393
- Services billed
- 2,642
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| New patient office or other outpatient visit, 45-59 minutes | 131 | 131 |
| Established patient office or other outpatient visit, 30-39 minutes | 75 | 70 |
| Diagnostic exam of bladder and urethra using an endoscope | 46 | 46 |
| Established patient office or other outpatient visit, 20-29 minutes | 45 | 43 |
| New patient office or other outpatient visit, 30-44 minutes | 35 | 35 |
| Electronic assessment of bladder emptying | 28 | 28 |
| Telehealth originating site facility fee | 26 | 24 |
| Established patient office or other outpatient visit, 40-54 minutes | 21 | 20 |
| Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies | 17 | 17 |
| Insertion of device into abdomen with pressure and urine flow rate study | 16 | 16 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Tamsulosin Hcl Other prescribers in Stanford, CA | 105 |
| Myrbetriq (mirabegron) Other prescribers in Stanford, CA | 80 |
| Finasteride Other prescribers in Stanford, CA | 61 |
| Solifenacin Succinate Other prescribers in Stanford, CA | 27 |
| Trospium Chloride Other prescribers in Stanford, CA | 26 |
| Alfuzosin Hcl Er (alfuzosin hcl) Other prescribers in Stanford, CA | 25 |
| Cephalexin Other prescribers in Stanford, CA | 21 |
| Amoxicillin-Clavulanate Potass (amoxicillin/potassium clav) Other prescribers in Stanford, CA | 15 |
| Tolterodine Tartrate Er (tolterodine tartrate) Other prescribers in Stanford, CA | 12 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 2 companies reported 8 payments worth $1,384 in total to this clinician.
| Boston Scientific Corporation | $769 |
|---|---|
| Intuitive Surgical, Inc. | $615 |
| Travel and Lodging | $1,151 |
|---|---|
| Food and Beverage | $233 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Intuitive Surgical, Inc. Dec 23, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to OKLAHOMA CITY, OK · in-kind | $596 |
| Boston Scientific Corporation Mar 27, 2025 | Travel and Lodging Lumenis Pulse 120H · Lumenis Pulse 120H_URO · travel to Boise, ID | $270 |
| Boston Scientific Corporation Jan 23, 2025 | Travel and Lodging Lumenis Pulse 120H · Lumenis Pulse 120H_URO · travel to Boise, ID · in-kind | $209 |
| Boston Scientific Corporation Mar 27, 2025 | Travel and Lodging Lumenis Pulse 120H · Lumenis Pulse 120H_URO · travel to Boise, ID | $56.86 |
| Intuitive Surgical, Inc. Dec 23, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to OKLAHOMA CITY, OK · in-kind | $19.00 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.