Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Aaron T. Olson, MD

Individual provider Family Medicine Physician · NPI 1316156227

Aaron T. Olson, MD is registered under Family Practice in Onalaska, Wisconsin. Graduated from Medical College of Wisconsin in 2005, 21 years ago. Practices with Mayo Clinic Health System-Southwest Wisconsin Region Inc, a 552-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Iowa and Wisconsin.

Years since qualifying
21
Trained at
Medical College of Wisconsin
Licensed in
IA, WI
In the registry since
2007
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3111 Gundersen Dr
Onalaska, WI 54650
Phone: (608) 775-8100
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 420 Dewey St, Wisconsin Rapids, WI 54494-4714 — (715) 421-7474

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 54782 (WI)
Family Medicine Physician Taxonomy 207Q00000X · Licence R-7919 (IA)
Family Medicine Physician Taxonomy 207Q00000X · Licence 37836 (IA)

Record details

NPI number1316156227
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 21, 2007
Last updated in NPPESDecember 4, 2020
Certification dateDecember 4, 2020

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2005 (21 years in practice)
Group practice Mayo Clinic Health System-Southwest Wisconsin Region Inc — 552 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
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 patients15
Services billed 17 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $19 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Mayo Clinic Health System-Southwest Wisconsin Region Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 552 clinicians in the practice; 12 are shown here.

Other providers in Onalaska