Frank Mainzer, M.D.
Diagnostic Radiology Physician · San Francisco, CA
Frank Mainzer, M.D. is a diagnostic radiology physician with a practice address in San Francisco, California, and NPI 1467402636, issued on May 11, 2006. Check the license (California G12512, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frank Mainzer
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- G12512 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 Hyde St, San Francisco, CA 94109
- Phone
- (415) 353-6390
- Enumerated
- May 11, 2006
- Record last updated
- Feb 25, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 00G125120 CA
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 900 Hyde St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Frank Mainzer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G12512Check 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 diagnostic radiology physician in 2024
18 Medicare Part D claims, against an average of 51 among the 2,711 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Frank Mainzer among 4,500 diagnostic radiology physician records in California
Frank Mainzer, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in San Francisco → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Edward Baker, M.D.San Francisco, CA 941091023057536
- Jerome Barakos, M.D.San Francisco, CA 941091972558922
- Stephen Benzian, MDSan Francisco, CA 941091619924032
- William Harvey, M.D.San Francisco, CA 941091689616757
- Michael Hope, MDSan Francisco, CA 941091699805093
- Amy Huang, MDSan Francisco, CA 941091639156326
- Maya Meux, M.D.San Francisco, CA 941091962441394
- Derk Purcell, M.D.San Francisco, CA 941091114047917
Common questions
What is Frank Mainzer, M.D.'s NPI number?
Frank Mainzer, M.D.'s National Provider Identifier (NPI) is 1467402636, issued on May 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Frank Mainzer, M.D. located?
The NPPES record lists a practice address at 900 Hyde St, San Francisco, CA, 94109. Phone: (415) 353-6390. Providers update this record themselves, so call before visiting.
How can I verify Frank Mainzer, M.D.'s license?
NPPES lists California license number G12512, 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 Frank Mainzer, M.D. prescribe under Medicare Part D?
In 2024, Frank Mainzer, M.D. had 18 Medicare Part D claims; the average among diagnostic radiology physician prescribers was 51. 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.