Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Jeffrey Millegan, MD, MPH
Psychiatry Physician in Oakland, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831251719
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Registry record
Entity type Individual (Type 1)
Name Dr. Jeffrey Millegan
Credential MD, MPH
Sex Male
Practice address 1300 Clay St, Oakland, CA, 94612
Phone (510) 752-1075
Enumeration date Dec 15, 2006
Last updated in NPPES Jun 17, 2026
Taxonomy & licenses
2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License MD-22374 (HI) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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
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.
What specialty is Jeffrey Millegan?
Jeffrey Millegan is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Mechel Henry Physical Medicine & Rehabilitation Physician · Oakland, CA NPI 1639131212 Sandra Smith Clinical Psychologist · Oakland, CA NPI 1124266242 Mechel Henry MD Inc Physical Medicine & Rehabilitation Physician · Oakland, CA NPI 1447667381 Disability Counseling Services Inc. Clinical Psychologist · Oakland, CA NPI 1174370241
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-17.