Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark W Wellnitz, O.D.

Optometrist in Glencoe, MN · enumerated 2010 · practices at Southwest Eye Care.

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

National Provider Identifier

1528374600

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark W Wellnitz

Credential O.D.

Sex Male

Practice address 1201 Greeley Ave N # 3, Glencoe, MN, 55336

Phone (320) 864-2020

Fax (320) 864-6678

Enumeration date Aug 26, 2010

Last updated in NPPES Mar 11, 2019

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3209 (MN) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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

What is the NPI number for Mark Wellnitz?

The National Provider Identifier (NPI) for Mark Wellnitz is 1528374600, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Wellnitz practice?

The practice location on file with NPPES is in Glencoe, MN. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Southwest Eye Care Optometrist · Glencoe, MN NPI 1144343252 Aubree Thorseth Optometrist · Glencoe, MN NPI 1104481985

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-03-11.