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AARON MICHAEL GINSTER M.D.
NPI 1265726582
Emergency Medicine in Grafton, WI

Active since June 03, 2011PECOS EnrolledAccepts Medicare Assignment
975 PORT WASHINGTON RD, GRAFTON, WI 53024(262) 329-1000 Get Directions Write a Review

NPPES record last updated: July 8, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 8, 2024, May 20, 2022 (2 updates tracked since 2022).

About Aaron Michael Ginster M.d. NPPES

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

AARON MICHAEL GINSTER M.D. (NPI 1265726582) is an individual emergency medicine provider in Grafton, Wisconsin, licensed in Wisconsin (63598) and active in the NPI registry since June 2011. He is enrolled in Medicare PECOS, is affiliated with Aurora St Lukes Medical Center, and is a graduate of Medical College Of Wisconsin (2011).

NPPES Registry Identity

NPI1265726582
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameAARON MICHAEL GINSTERCredential: M.D.
Location Address975 PORT WASHINGTON RDGrafton, WI 53024-9204
Mailing AddressPo Box 735044Chicago, IL 60673-5044 · (800) 326-2250
Phone(262) 329-1000
Sole ProprietorNo
Medical School CMSMedical College Of WisconsinGraduated 2011
Enumeration DateJune 3, 2011
Last NPPES UpdateJuly 8, 20242 updates tracked since enumeration
NPPES CertifiedJuly 8, 2024
✔ NPI 1265726582 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in WI · 63598✔ Licensed in IL · 125059600
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
975 PORT WASHINGTON RD, Grafton, WI 53024
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Other Identifiers 1

Medicaid100045979WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource (Common Ground Healthcare).Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Aaron Michael Ginster M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9931411741
PECOS Enrollment IDI20150708001524
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Aaron Ginster reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Aurora Medical Group, Inc.
23 mi
Obstetrics & Gynecology
8905 W LINCOLN AVE, SUITE 515
West Allis, WI 53227
  • Reassigned Medicare billing, Wisconsin enrollment
  • 4,609 clinicians in this Medicare group
NPI 1457592735 (414) 328-8650
Ermed, Sc
23 mi
Emergency Medicine
2900 W OKLAHOMA AVE
Milwaukee, WI 53215
  • Reassigned Medicare billing, Wisconsin enrollment
  • 49 clinicians in this Medicare group
NPI 1023076296 (414) 649-7299

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
234 services229 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
215 services206 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
61 services61 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
59 services59 patients
Ultrasound of heart, follow-up 93308
A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.
29 services29 patients
Ultrasound scan of chest 76604
An ultrasound scan of the chest is a non-invasive imaging procedure that uses sound waves to create pictures of the structures within your chest, such as your heart and lungs. It's a safe, painless method that helps doctors diagnose and monitor various conditions.
19 services19 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Aurora St Lukes Medical Center

Acute Care Hospitals · Milwaukee, WI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520138
Location2900 W Oklahoma AveMilwaukee, WI 53215 · Milwaukee County
Emergency services Birthing friendly

West Allis Memorial Hospital

Acute Care Hospitals · West Allis, WI
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520139
Location8901 W Lincoln AveWest Allis, WI 53227 · Milwaukee County
Emergency services Birthing friendly

Aurora Medical Center

Acute Care Hospitals · Grafton, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520207
Location975 Port Washington RoadGrafton, WI 53024 · Ozaukee County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53024 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$82.92 typical visit price
range $53.90 – $163.24
Typical copayment $20.73 (range $13.47 – $40.81)
Most-billed visit code 99203
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

ANNE R. HARLEY P.T.
Physical Therapist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
MRS. MARGARET AIKINS KEUP APNP
Nurse Practitioner (Acute Care)
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
DR. TYLER ANDREW FRISQUE PHARMD
Pharmacist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1600
CAITLIN DERENNE PA
Physician Assistant
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (360) 606-4292
DR. TIMOTHY JARON POW M.D.
Internal Medicine (Interventional Cardiology)
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-8150
REBEKAH L OTTE NP
Nurse Practitioner
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-8150
HAMID ABBAS AFSARI D.O.
Hospitalist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
JESSICA BROOKS RYAN SLP
Speech-Language Pathologist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-2700

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 Aaron Ginster's NPI number?

The NPI number for Aaron Ginster is 1265726582. It was assigned to this individual provider in the NPPES registry on June 3, 2011.

Where is Aaron Ginster located?

Aaron Ginster practices at 975 Port Washington Rd, Grafton, WI 53024. The listed phone number is (262) 329-1000.

What is Aaron Ginster's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Aaron Ginster enrolled in Medicare?

Yes. Aaron Ginster is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Aaron Ginster's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Ginster reassigns Medicare benefits to 2 organizations: Aurora Medical Group, Inc. (West Allis, WI) and Ermed, Sc (Milwaukee, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Aaron Ginster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Aaron Ginster accept?

Health plans from CareSource (Common Ground Healthcare) list Aaron Ginster as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Aaron Ginster affiliated with any hospitals?

According to CMS data, Aaron Ginster is affiliated with Aurora St Lukes Medical Center, West Allis Memorial Hospital and Aurora Medical Center.

When was this NPI record last updated?

The NPPES record for Aaron Ginster was last updated on July 8, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.