Jan A. Winetz, MD
Nephrology Physician · San Jose, CA
Jan A. Winetz, MD is a nephrology physician with a practice address in San Jose, California, and NPI 1790777852, issued on Aug 16, 2005. Check the license (California G412450, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jan A. Winetz
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- G412450 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2505 Samaritan Dr, San Jose, CA 95124
- Phone
- (408) 356-8133
- Enumerated
- Aug 16, 2005
- Record last updated
- May 17, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (408) 356-6923
- Medicaid ID
- 00G412450 CA
- Medicare enrollment
- Enrolled (PECOS I20251116000147); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 2505 Samaritan Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Matthew Bloom, M.D.Surgical Critical Care Physician1477631844
- Jacqueline Chak, M.D.Pediatrics Physician1558684647
- Carole Cook, M.D.Gynecology Physician1710003850
- Mark Eastham, M.D.Specialist1881610376
- Lauren Farash, M.D., M.P.H.Pediatrics Physician1215170147
- Ernesto Gonzalez, M.D.Neonatal-Perinatal Medicine Physician1689937344
Verify Jan A. Winetz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G412450Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average nephrology physician in 2024
198 Medicare Part D claims for 102 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 17 claims were for opioids.
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 2 group practices
- CH Specialty Services NV Requeijo PCCarson City, NV
- Northbay Physicians Surgery Center, LLCFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jan A. Winetz among 1,468 nephrology physician records in California
Jan A. Winetz, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1976 · median 2001 among the 1,128 with a school on file
- Record last updated2016 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in San Jose → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Archana Dhawan, M.D.San Jose, CA 951241649294273
- Khoi Hoang, MDSan Jose, CA 951241821099359
- Tarla Joshi, MDSan Jose, CA 951241669474458
- Steven Tilles, MDSan Jose, CA 951241841292745
- Alexander Doan, MDSan Jose, CA 951281003859661
- Lewis Haut, MDSan Jose, CA 951281760490510
- June Lugovoy, MDSan Jose, CA 951281508822248
- Nicholas MonacoSan Jose, CA 951281457404816
Common questions
What is Jan A. Winetz, MD's NPI number?
Jan A. Winetz, MD's National Provider Identifier (NPI) is 1790777852, issued on Aug 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jan A. Winetz, MD located?
The NPPES record lists a practice address at 2505 Samaritan Dr, San Jose, CA, 95124. Phone: (408) 356-8133. Providers update this record themselves, so call before visiting.
How can I verify Jan A. Winetz, MD's license?
NPPES lists California license number G412450, 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 Jan A. Winetz, MD prescribe under Medicare Part D?
In 2024, Jan A. Winetz, MD had 198 Medicare Part D claims for 102 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.