Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Michael John Butler, M.D.
Neurology Physician in Oakland, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699825737
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Michael John Butler
Credential M.D.
Sex Male
Practice address 4174 Park Blvd, Suite C, Oakland, CA, 94602
Phone (510) 530-0170
Fax (510) 530-0171
Enumeration date Jan 11, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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 Michael Butler?
Michael Butler is registered in NPPES with the primary taxonomy of Neurology 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 → Dr Yabu & Dr Lim DDS General Practice Dentistry · Oakland, CA NPI 1316943038 Sigal Medical Group Clinical Neuropsychologist · Oakland, CA NPI 1972652543 Anita Purohit General Practice Dentistry · Oakland, CA NPI 1780701292 Geraldine Lim Dentist · Oakland, CA NPI 1003085986 Eric Yabu Dentist · Oakland, CA NPI 1902220247
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.