Ryan Ruey-En Sun, MD
Urology Physician · Stanford, CA
Ryan Ruey-En Sun, MD is a urology physician with a practice address in Stanford, California, and NPI 1891430807, issued on May 3, 2022. Check the license (California A177263, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ryan Ruey-En Sun
- Credential
- MD
- Primary taxonomy
- Urology Physician 208800000X
- License number
- A177263 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- May 3, 2022
- Record last updated
- Mar 14, 2024
- Medicare enrollment
- Enrolled (PECOS I20220715001120); accepts Medicare assignment
- Medical or professional school
- University Of Toronto, Faculty Of Medicine, 2017
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,524 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ryan Ruey-En Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A177263Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average urology physician in 2024
475 Medicare Part D claims for 188 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl105 claims
- Myrbetriq80 claims
- Finasteride61 claims
- Solifenacin Succinate27 claims
- Trospium Chloride26 claims
- Alfuzosin Hcl Er25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $121.41
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 9,340 providers of this specialty with any payment received $3,800.04 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Ryan Ruey-En Sun among 1,524 urology physician records in California
Ryan Ruey-En Sun, MD is one of 1,524 urology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, 1% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2017 · median 2003 among the 1,049 with a school on file
- Record last updated2024 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in California
There are 1,524 urology physician records in California.
All 1,524 in California → Every provider in Stanford → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Jennifer Abidari, MDStanford, CA 943051811098197
- Rodney Anderson, MDStanford, CA 943051265443246
- James Brooks, MDStanford, CA 943051043320005
- Benjamin Chung, M.D.Stanford, CA 943051205945920
- Craig Comiter, MDStanford, CA 943051780657171
- Michael Eisenberg, MDStanford, CA 943051508999749
- Harcharan Gill, MDStanford, CA 943051326152422
- Vanessa Gulla, M.D.Stanford, CA 943051376648279
Common questions
What is Ryan Ruey-En Sun, MD's NPI number?
Ryan Ruey-En Sun, MD's National Provider Identifier (NPI) is 1891430807, issued on May 3, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Ryan Ruey-En Sun, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Ryan Ruey-En Sun, MD's license?
NPPES lists California license number A177263, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ryan Ruey-En Sun, MD prescribe under Medicare Part D?
In 2024, Ryan Ruey-En Sun, MD had 475 Medicare Part D claims for 188 beneficiaries; the average among urology physician prescribers was 1,340. Part D covers Medicare prescriptions only.
What is Ryan Ruey-En Sun, MD's MIPS final score?
The 2023 MIPS final score is 76.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.