Michael Walter Weiner, M.D.
Nephrology Physician · San Francisco, CA
Michael Walter Weiner, M.D. is a nephrology physician with a practice address in San Francisco, California, and NPI 1346359502, issued on Aug 30, 2006. Check the license (California G28940, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Walter Weiner
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- G28940 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4150 Clement St, San Francisco, CA 94121
- Phone
- (415) 221-4810
- Enumerated
- Aug 30, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 4150 Clement St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Alison Acerra, MS, RDRegistered Dietitian1992726848
- Sharon AdelsonCounselor1932467271
- Gary Agcaoili, C.T.R.SRecreation Therapist1649284019
Verify Michael Walter Weiner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G28940Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average nephrology physician in 2024
35 Medicare Part D claims, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $4,225.00
2 payments; by number, the most common kind was consulting fee; the largest payer was Merck Sharp & Dohme LLC. The 8,230 providers of this specialty with any payment received $3,091.37 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.
Michael Walter Weiner among 1,468 nephrology physician records in California
Michael Walter Weiner, M.D. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileNo · 77% of these records are
- Record last updated2007 · 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 Francisco → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Naomi Anker, M.D.San Francisco, CA 941211487881900
- David LovettSan Francisco, CA 941211245261544
- David Goldberg, MDSan Francisco, CA 941181740296276
- Jamshid Amanzadeh, MDSan Francisco, CA 941151629170428
- Michael Borah, MDSan Francisco, CA 941151144395435
- Alan Coleman, M.D.San Francisco, CA 941151013089580
- Young Hsu, MDSan Francisco, CA 941151982163101
- Tracy Jonelis, MDSan Francisco, CA 941151942372776
Common questions
What is Michael Walter Weiner, M.D.'s NPI number?
Michael Walter Weiner, M.D.'s National Provider Identifier (NPI) is 1346359502, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Walter Weiner, M.D. located?
The NPPES record lists a practice address at 4150 Clement St, San Francisco, CA, 94121. Phone: (415) 221-4810. Providers update this record themselves, so call before visiting.
How can I verify Michael Walter Weiner, M.D.'s license?
NPPES lists California license number G28940, 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 Michael Walter Weiner, M.D. prescribe under Medicare Part D?
In 2024, Michael Walter Weiner, M.D. had 35 Medicare Part D claims; 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.