Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Jennifer S. Shimshak, PA-C

Individual provider Physician Assistant · NPI 1598028128

Jennifer S. Shimshak, PA-C is a Physician Assistant in Onalaska, Wisconsin. Qualified in 2012, 14 years ago. Practices with Gundersen Clinic Ltd, a 427-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
14
Licensed in
WI
In the registry since
2012
Specialties on file
2
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

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Practice location Address checks out

3111 Gundersen Dr
Onalaska, WI 54650-8447 Not confirmed with CMS for 12 years — call before visiting
Phone: (608) 775-8630
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Physician Assistant (primary) Taxonomy 363AM0700X · Licence 2922 (WI)
Physician Assistant Taxonomy 363A00000X · Licence 2922 (WI)

Record details

NPI number1598028128
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA-C
Sole proprietorNo
NPI enumeratedJune 19, 2012
Last updated in NPPESJanuary 10, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice Gundersen Clinic Ltd — 427 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients213
Services billed 376 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Gundersen Clinic Ltd

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 427 clinicians in the practice; 12 are shown here.

Other providers in Onalaska