Ronald Y. Yamaguchi, MD
Urology Physician · Santa Clara, CA
Ronald Y. Yamaguchi, MD is a urology physician with a practice address in Santa Clara, California, and NPI 1104905843, issued on Nov 3, 2006. Check the license (California G79384, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald Y. Yamaguchi
- Credential
- MD
- Primary taxonomy
- Urology Physician 208800000X
- License number
- G79384 CA
Self-reported in NPPES; status is on the state search - Practice location
- 710 Lawrence Expy, Santa Clara, CA 95051
- Phone
- (408) 851-1000
- Enumerated
- Nov 3, 2006
- Record last updated
- Dec 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G793840 CA
- Medicare enrollment
- Enrolled (PECOS I20101221000404); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1992
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,524 in California → Look up another NPI →
Also registered at 710 Lawrence Expy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Iype Abraham, M.D.Internal Medicine Physician1578737243
- Oren Abramson, MDPediatric Gastroenterology Physician1265511307
- Jamie Adiarte, PA-CPhysician Assistant1073824413
- Sarah Adut, PHDClinical Psychologist1609484831
- Najla Ahmadzia, M.D.Student in an Organized Health Care Education/Training Program1568692580
- Farhana Ahmed, MDHospitalist Physician1215110002
Verify Ronald Y. Yamaguchi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G79384Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average urology physician in 2024
1,195 Medicare Part D claims for 420 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims. 12 claims were for opioids.
Most prescribed
- Finasteride482 claims
- Tamsulosin Hcl225 claims
- Terazosin Hcl136 claims
- Sulfamethoxazole-Trimethoprim55 claims
- Ciprofloxacin Hcl44 claims
- Trospium Chloride31 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald Y. Yamaguchi among 1,524 urology physician records in California
Ronald Y. Yamaguchi, 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 51% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1992 · median 2003 among the 1,049 with a school on file
- Record last updated2021 · 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 Santa Clara → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Sarah Chan, MDSanta Clara, CA 950511114186186
- Sarah Evans, M.D.Santa Clara, CA 950511114900461
- Pauline Filippou, M.D.Santa Clara, CA 950511467849695
- David Guo, MDSanta Clara, CA 950511598054991
- Robert Harris, MDSanta Clara, CA 950511184703225
- Lisa Hata, MDSanta Clara, CA 950511225698566
- Mehdi Kamarei, MDSanta Clara, CA 950511528145463
- Dale Kunihira, M.D.Santa Clara, CA 950511962522540
Common questions
What is Ronald Y. Yamaguchi, MD's NPI number?
Ronald Y. Yamaguchi, MD's National Provider Identifier (NPI) is 1104905843, issued on Nov 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Y. Yamaguchi, MD located?
The NPPES record lists a practice address at 710 Lawrence Expy, Santa Clara, CA, 95051. Phone: (408) 851-1000. Providers update this record themselves, so call before visiting.
How can I verify Ronald Y. Yamaguchi, MD's license?
NPPES lists California license number G79384, 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 Ronald Y. Yamaguchi, MD prescribe under Medicare Part D?
In 2024, Ronald Y. Yamaguchi, MD had 1,195 Medicare Part D claims for 420 beneficiaries; the average among urology physician prescribers was 1,340. Part D covers Medicare prescriptions only.
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.