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

Aaron Michael Ginster, MD

Individual provider Emergency Medicine Physician · NPI 1265726582

Aaron Michael Ginster, MD practises Emergency Medicine in Grafton, Wisconsin. Graduated from Medical College of Wisconsin in 2011, 15 years ago. Practices with Ermed, SC, a 45-clinician group and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
15
Trained at
Medical College of Wisconsin
Licensed in
IL, WI
In the registry since
2011
Specialties on file
2
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

975 Port Washington Rd
Grafton, WI 53024-9204
Phone: (262) 329-1000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 63598 (WI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 125059600 (IL)

Record details

NPI number1265726582
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 3, 2011
Last updated in NPPESJuly 8, 2024
Certification dateJuly 8, 2024

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2011 (15 years in practice)
Group practice Ermed, Sc — 45 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients386
Services billed 659 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Ermed, SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 45 clinicians in the practice; 12 are shown here.

Other providers in Grafton