Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Diana Marie Douglas, O.D.
Optometrist in Warren, OH · enumerated 2009.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1144452459
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Registry record
Entity type Individual (Type 1)
Name Dr. Diana Marie Douglas
Credential O.D.
Sex Female
Practice address 302 Niles Cortland Rd Ne, Warren, OH, 44484
Phone (330) 394-2020
Fax (330) 395-7194
Enumeration date Aug 20, 2009
Last updated in NPPES Nov 21, 2025
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 Diana Douglas practice?
The practice location on file with NPPES is in Warren, OH. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Diana Douglas?
The National Provider Identifier (NPI) for Diana Douglas is 1144452459, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-21.