Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Michael J Duffy, PA
Physician Assistant in Oakland, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1801839188
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Michael J Duffy
Credential PA
Sex Male
Practice address 3315 Broadway, Oakland, CA, 94611
Phone (510) 486-2300
Fax (510) 486-2333
Enumeration date Jun 14, 2006
Last updated in NPPES Jul 21, 2022
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA11368 (CA) Primary
PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program.
About the PA credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 37623171 | Medicaid | NY | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What specialty is Michael Duffy?
Michael Duffy is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Thomas Peatman Orthopaedic Surgery Physician · Oakland, CA NPI 1427041938 Peter Slabaugh Orthopaedic Surgery of the Spine Physician · Oakland, CA NPI 1447227392 Kendrick Lee Orthopaedic Hand Surgery Physician · Oakland, CA NPI 1508833377 Webster Orthopaedic Medical Group, A Professional Corporation Orthopaedic Surgery Physician · Oakland, CA NPI 1316914385 Ross Talarico Foot & Ankle Surgery Podiatrist · Oakland, CA NPI 1265581037 Eric Stuffmann Orthopaedic Hand Surgery Physician · Oakland, CA NPI 1922294719 Shawn Lies Surgical Physician Assistant · Oakland, CA NPI 1578796439 Anthony Porter Orthopaedic Surgery Physician · Oakland, CA NPI 1679869515
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.