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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ROBERT C MCMAHON OD
NPI 1598711400
Optometrist in Winona, MN

Active since May 25, 2006
106 E 2ND ST, WINONA, MN 55987(507) 454-4640 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Robert C Mcmahon Od NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ROBERT C MCMAHON OD (NPI 1598711400) is an individual optometrist in Winona, Minnesota, licensed in Minnesota (1471) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1598711400
Entity TypeIndividualMale
Primary Taxonomy152W00000X
Provider Legal NameROBERT C MCMAHONCredential: OD
Location Address106 E 2ND STWinona, MN 55987-3410
Mailing Address1836 South AveLa Crosse, WI 54601-5429 · (608) 782-7300 · Fax (608) 775-4429
Phone(507) 454-4640
Sole ProprietorNo
Enumeration DateMay 25, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1598711400 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
License✔ Licensed in MN · 1471
Definition
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
106 E 2ND ST, Winona, MN 55987
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Other Identifiers 1

Medicaid38629600WI

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

GUNDERSEN CLINIC, LTD.
Optometrist
106 E 2ND ST
WINONA, MN 55987
Winona County (608) 782-7300
BRADLEE G WOLNER OD
Optometrist
106 E 2ND ST
WINONA, MN 55987
Winona County (507) 454-4640

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Mcmahon's NPI number?

The NPI number for Robert Mcmahon is 1598711400. It was assigned to this individual provider in the NPPES registry on May 25, 2006.

Where is Robert Mcmahon located?

Robert Mcmahon practices at 106 E 2nd St, Winona, MN 55987. The listed phone number is (507) 454-4640.

What is Robert Mcmahon's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

When was this NPI record last updated?

The NPPES record for Robert Mcmahon was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.