Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark B Gordon, O.D.
Optometrist in Baltimore, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1821028382
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Mark B Gordon
Credential O.D.
Sex Male
Practice address 100 Park Ave, Baltimore, MD, 21201
Phone (410) 752-1677
Fax (410) 752-4435
Enumeration date Jul 3, 2006
Last updated in NPPES Mar 21, 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 |
|---|---|---|---|
| 522190 | Other | MD | BCBS |
| S017-0006 | Other | MD | BLUECHOICE |
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
How do I verify Mark Gordon's NPI record?
Cross-check NPI 1821028382 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1821028382 active?
Yes, as of the latest NPPES snapshot, NPI 1821028382 is active (record last updated 2008-03-21).
Other providers at this practice address
Browse all → Barenburg Optical Service, Inc Optometrist · Baltimore, MD NPI 1639179112 Ross Fischer Optometrist · Baltimore, MD NPI 1720173594 Jonathan Ekedahl Ophthalmology Physician · Baltimore, MD NPI 1174781686 Barenburg Optometric Service, Inc Ophthalmology Physician · Baltimore, MD NPI 1073858759 Clarke Nelson Ophthalmology Physician · Baltimore, MD NPI 1558894923 Angela Mantzavinos Optometrist · Baltimore, MD NPI 1740971787 Barenburg Optical Service, Inc Ophthalmology Physician · Baltimore, MD NPI 1376381608
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-21.