Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael A Sless, O.D. P.A.

Optometrist in Monkton, MD · enumerated 2007 · authorized official Michael Sless, President.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1528252632

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Registry record

Entity type Organization (Type 2)

Legal business name Michael A Sless, O.D. P.A.

Other name <Unavail>

Practice address 16940 York Rd Ste 200, Monkton, MD, 21111

Phone (410) 343-2409

Enumeration date Aug 31, 2007

Last updated in NPPES Nov 11, 2009

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License TA0896 (MD) Primary

Authorized official

Name Michael Sless

Title President

Phone (410) 343-2409

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Michael A Sless, O.D. P.A. located?

The practice location on file with NPPES is in Monkton, MD.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-11-11. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-11.