Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark Ossi, OD
Optometrist in Leesburg, FL · enumerated 2019.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1245883297
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Registry record
Entity type Individual (Type 1)
Name Dr. Mark Ossi
Credential OD
Sex Male
Practice address 225 N 1st St, Leesburg, FL, 34748
Phone (407) 905-8827
Fax (352) 360-2389
Enumeration date Jul 18, 2019
Last updated in NPPES Nov 27, 2023
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
Where does Mark Ossi practice?
The practice location on file with NPPES is in Leesburg, FL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Ossi?
The National Provider Identifier (NPI) for Mark Ossi is 1245883297, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-27.