Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Ritzinger Optometric Clinic Sc

Optometrist in Hudson, WI · enumerated 2006 · authorized official Mark Ritzinger, Owner.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1407816929

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Ritzinger Optometric Clinic Sc

Parent organization Ritzinger Optometric Clinic Sc

Practice address 211 Second St, Hudson, WI, 54016

Phone (715) 386-2020

Fax (715) 386-1600

Enumeration date Mar 27, 2006

Last updated in NPPES Nov 12, 2009

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers Primary

Authorized official

Name Mark Ritzinger

Title Owner

Phone (715) 425-7235

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-11-12. Verify at npiregistry.cms.hhs.gov.

Where is Ritzinger Optometric Clinic Sc located?

The practice location on file with NPPES is in Hudson, WI.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2009-11-12.