Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Michael William Olff, DC
Chiropractor in Discovery Bay, CA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679564942
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Registry record
Entity type Individual (Type 1)
Name Dr. Michael William Olff
Credential DC
Sex Male
Practice address 1555 Riverlake Rd, Ste. L., Discovery Bay, CA, 94514
Phone (925) 240-6533
Fax (925) 778-8109
Enumeration date Nov 4, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC 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
What is the NPI number for Michael Olff?
The National Provider Identifier (NPI) for Michael Olff is 1679564942, a Type 1 (individual) record in the CMS NPPES registry.
Where does Michael Olff practice?
The practice location on file with NPPES is in Discovery Bay, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.