Michael Duffy, PA
Physician Assistant · Oakland, CA
Michael Duffy, PA is a physician assistant with a practice address in Oakland, California, and NPI 1801839188, issued on Jun 14, 2006. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Michael Duffy
- Credential
- PA
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 3315 Broadway, Oakland, CA 94611
- Phone
- (510) 486-2300
- Enumerated
- Jun 14, 2006
- Entity
- Type 1 · individual
Also registered at 3315 Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
15% fewer Medicare Part D claims than the average physician assistant in 2024
708 Medicare Part D claims for 386 beneficiaries, against an average of 832 among the 95,030 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Amoxicillin-Clavulanate Potass56 claims
- Nitrofurantoin Mono-Macro35 claims
- Azithromycin33 claims
- Lisinopril26 claims
- Gabapentin21 claims
- Eliquis20 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.
Physician Assistant providers in California
There are 13,861 physician assistant records in California.
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Common questions
What is Michael Duffy, PA's NPI number?
Michael Duffy, PA's National Provider Identifier (NPI) is 1801839188, issued on Jun 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Duffy, PA located?
The NPPES record lists a practice address at 3315 Broadway, Oakland, CA, 94611. Phone: (510) 486-2300. Providers update this record themselves, so call before visiting.
How can I verify Michael Duffy, PA's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Michael Duffy, PA prescribe under Medicare Part D?
In 2024, Michael Duffy, PA had 708 Medicare Part D claims for 386 beneficiaries; the average among physician assistant prescribers was 832. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.