Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Michael D Thomas, OD
Optometrist in Madison, IN · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1689673121
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Registry record
Entity type Individual (Type 1)
Name Dr. Michael D Thomas
Credential OD
Sex Male
Practice address 441 Green Rd, Madison, IN, 47250
Phone (812) 273-2020
Fax (812) 273-4022
Enumeration date Jul 18, 2005
Last updated in NPPES Dec 12, 2007
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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 NPI 1689673121 active?
Yes, as of the latest NPPES snapshot, NPI 1689673121 is active (record last updated 2007-12-12).
How do I verify Michael Thomas's NPI record?
Cross-check NPI 1689673121 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-12-12.