1. Home
  2. Directory
  3. Wisconsin
  4. Fond Du Lac
  5. Family Medicine
  6. NPI Profile

GAY D TREPANIER MD
NPI 1164415709
Family Medicine - Geriatric Medicine in Fond Du Lac, WI

Active since August 30, 2005
481 E DIVISION ST, SUITE 100, FOND DU LAC, WI 54935(920) 929-8120(920) 929-8126 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Gay D Trepanier Md NPPES

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

GAY D TREPANIER MD (NPI 1164415709) is an individual geriatric medicine provider in Fond Du Lac, Wisconsin, licensed in Wisconsin (16852) and active in the NPI registry since August 2005.

NPPES Registry Identity

NPI1164415709
Entity TypeIndividualMale
Primary Taxonomy207QG0300X
Provider Legal NameGAY D TREPANIERCredential: MD
Location Address481 E DIVISION ST, SUITE 100Fond Du Lac, WI 54935-3748
Mailing Address481 E Division St, Suite 100Fond Du Lac, WI 54935-3748 · (920) 929-8120 · Fax (920) 929-8126
Phone(920) 929-8120
Fax(920) 929-8126
Sole ProprietorNo
Enumeration DateAugust 30, 2005
Last NPPES UpdateSeptember 11, 2025
✔ NPI 1164415709 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QG0300X
License✔ Licensed in WI · 16852
Definition
A family medicine physician with special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes, and the hospital.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 16852 (WI)
481 E DIVISION ST, Fond Du Lac, WI 54935
Open in Google Maps ↗

Other Identifiers 1

Medicaid31081800WI

Other Providers at the Same Location NPPES 17

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

GREGORY B KAPALA M.D.
Radiology (Diagnostic Radiology)
481 E DIVISION ST
FOND DU LAC, WI 54935
Fond Du Lac County (920) 921-5676
TERRY FOX BCHIS
Hearing Instrument Specialist
481 E DIVISION ST, STE 900
FOND DU LAC, WI 54935
Fond Du Lac County (920) 926-1288
RADIOLOGY FOND DU LAC LTD
Radiology (Diagnostic Radiology)
481 E DIVISION ST
FOND DU LAC, WI 54935
Fond Du Lac County (920) 921-5676
ANDREW R. KARAU H.I.S
Hearing Instrument Specialist
481 E DIVISION ST
FOND DU LAC, WI 54935
Fond Du Lac County (920) 926-1288
MARCIE ANN JANZ APNP
Family Medicine (Geriatric Medicine)
481 E DIVISION ST, SUITE 100
FOND DU LAC, WI 54935
Fond Du Lac County (920) 929-8120
MS. ANN MARIE PICKART HEARING INST SPECIAL
Hearing Instrument Specialist
481 E DIVISION ST, STE 900
FOND DU LAC, WI 54935
Fond Du Lac County (920) 926-1288
RICHARD E SIMPSON III M.D.
Radiology (Diagnostic Radiology)
481 E DIVISION ST
FOND DU LAC, WI 54935
Fond Du Lac County (920) 921-5676
KEVIN L KETCHUM M.D.
Radiology (Diagnostic Radiology)
481 E DIVISION ST
FOND DU LAC, WI 54935
Fond Du Lac County (920) 921-5676

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 Gay Trepanier's NPI number?

The NPI number for Gay Trepanier is 1164415709. It was assigned to this individual provider in the NPPES registry on August 30, 2005.

Where is Gay Trepanier located?

Gay Trepanier practices at 481 E Division St Suite 100, Fond Du Lac, WI 54935. The listed phone number is (920) 929-8120.

What is Gay Trepanier's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Geriatric Medicine, with taxonomy code 207QG0300X.

When was this NPI record last updated?

The NPPES record for Gay Trepanier was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.