Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael W. Hammer,O.D. Inc.

Optometrist in Mason, OH · enumerated 2012 · authorized official Michael Hammer, President.

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

National Provider Identifier

1316208317

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Michael W. Hammer,O.D. Inc.

Practice address 126 E Main St, Mason, OH, 45040

Phone (513) 677-2840

Fax (513) 677-2840

Enumeration date Jun 6, 2012

Last updated in NPPES Jun 6, 2012

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License 3773T58 (OH) Primary

Authorized official

Name Michael Hammer

Title President

Phone (513) 677-2840

Other identifiers

Identifier	Type	State	Issuer
000000014088	Other	OH	BLUE CROSS BLUE SHIELD
0598214	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.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2012-06-06. Verify at npiregistry.cms.hhs.gov.

Where is Michael W. Hammer,O.D. Inc. located?

The practice location on file with NPPES is in Mason, OH.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-06.