Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark E Bernthal, OD
Optometrist in St Clair Shores, MI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1811991391
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Registry record
Entity type Individual (Type 1)
Name Mark E Bernthal
Credential OD
Sex Male
Practice address 21711 Greater Mack Ave, St Clair Shores, MI, 48080
Phone (586) 774-0393
Enumeration date Jun 13, 2005
Last updated in NPPES Jun 11, 2008
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 |
|---|---|---|---|
| 0218080001 | Other | MI | DMERC |
| 410016688 | Other | MI | MEDICARE RAILROAD |
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 1811991391 active?
Yes, as of the latest NPPES snapshot, NPI 1811991391 is active (record last updated 2008-06-11).
How do I verify Mark Bernthal's NPI record?
Cross-check NPI 1811991391 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 → James Klein Ophthalmology Physician · St Clair Shores, MI NPI 1104828482 Mariann Channell Ophthalmology Physician · St Clair Shores, MI NPI 1225030596 Richard C Mertz Jr MD PC Ophthalmology Physician · St Clair Shores, MI NPI 1467408914 Shorepointe Optical Inc Eyewear Supplier · Saint Clair Shores, MI NPI 1750465530 Richard C Mertz Jr MD PC Ambulatory Surgical Clinic/Center · Saint Clair Shores, MI NPI 1043395502 St Clair Shores Mi Ophthalmology Asc LLC Ambulatory Surgical Clinic/Center · Saint Clair Shores, MI NPI 1326215468
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-11.