Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Donald Trease, O.D.
Optometrist in South Bend, IN · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1346287109
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Registry record
Entity type Individual (Type 1)
Name Donald Trease
Credential O.D.
Sex Male
Practice address 4123 S Michigan St, South Bend, IN, 46614
Phone (574) 291-8900
Fax (574) 299-8503
Enumeration date Jun 1, 2006
Last updated in NPPES Jul 8, 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 1346287109 active?
Yes, as of the latest NPPES snapshot, NPI 1346287109 is active (record last updated 2007-07-08).
How do I verify Donald Trease's NPI record?
Cross-check NPI 1346287109 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 → Christopher J. Wolf, Od, Inc Optometrist · South Bend, IN NPI 1023069283 Christopher Wolf Optometrist · South Bend, IN NPI 1174564173 Lisa Cammett Optometrist · South Bend, IN NPI 1861420283 Northern Indiana Optometrists, PC Optometrist · South Bend, IN NPI 1841215738 James Longenecker Optometrist · South Bend, IN NPI 1154462711
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.