Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael W O'Riordan, D.D.S.,M.S.

Pediatric Dentistry in Warren, MI · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1689637324

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Michael W O'Riordan

Credential D.D.S.,M.S.

Sex Male

Practice address 11662 Martin Rd, Warren, MI, 48093

Phone (586) 754-6300

Fax (586) 754-6407

Enumeration date Apr 11, 2006

Last updated in NPPES Jun 10, 2009

Taxonomy & licenses

1223P0221X Pediatric Dentistry Dental Providers · License 10466 (MI) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Michael O'Riordan?

The National Provider Identifier (NPI) for Michael O'Riordan is 1689637324, a Type 1 (individual) record in the CMS NPPES registry.

Where does Michael O'Riordan practice?

The practice location on file with NPPES is in Warren, MI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-10.