Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Robert & William Hass Optometrists Professional Corp

Optometrist in Owosso, MI · enumerated 2006 · authorized official William Hass, President.

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

National Provider Identifier

1396859773

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Registry record

Entity type Organization (Type 2)

Legal business name Robert & William Hass Optometrists Professional Corp

Practice address 120 N Hickory St, Owosso, MI, 48867

Phone (989) 725-5330

Fax (989) 723-2303

Enumeration date Aug 19, 2006

Last updated in NPPES Oct 24, 2017

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License 4901002552 (MI) Primary

332H00000X Eyewear Supplier Suppliers · License 4901002552 (MI) Secondary

332H00000X Eyewear Supplier Suppliers · License 4901002808 (MI) Secondary

Authorized official

Name William Hass

Title President

Phone (989) 725-5330

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 2017-10-24. Verify at npiregistry.cms.hhs.gov.

Where is Robert & William Hass Optometrists Professional Corp located?

The practice location on file with NPPES is in Owosso, MI.

Providers at this address

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Steven Hass Optometrist · Owosso, MI NPI 1700167111

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-10-24.