Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Louis W Mastrian, O.D.
Optometrist in Hermitage, PA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1255314043
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Registry record
Entity type Individual (Type 1)
Name Louis W Mastrian
Credential O.D.
Sex Male
Practice address 490 N Kerrwood Dr, Suite 203, Hermitage, PA, 16148
Phone (724) 342-2733
Fax (724) 342-6652
Enumeration date Nov 25, 2005
Last updated in NPPES Sep 6, 2012
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 001214412 | Medicaid | PA | - |
| 418468 | Medicaid | OH | - |
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 1255314043 active?
Yes, as of the latest NPPES snapshot, NPI 1255314043 is active (record last updated 2012-09-06).
How do I verify Louis Mastrian's NPI record?
Cross-check NPI 1255314043 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 → Margaret Mastrian Optometrist · Hermitage, PA NPI 1972586766 Muscarella Chiropractic, PC Chiropractor · Hermitage, PA NPI 1770603169 Charles Gulland Orthodontics and Dentofacial Orthopedics Dentistry · Hermitage, PA NPI 1427274125 Mastrian Eyecare, LLC Optometrist · Hermitage, PA NPI 1811299191 Chiropractic and Wellness Works,LLC Rehabilitation Chiropractor · Hermitage, PA NPI 1366716672 Kevin Pollock Optometrist · Hermitage, PA NPI 1134067382
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-06.