William Joseph Ares, MD
NPI 1396039442ActiveIndividual· Neurological Surgery· Evanston, IL
Neurological Surgery (MD) with Endeavor Health Medical Group, practicing in Evanston, Illinois. 277 Medicare patients in 2024, $195,894 paid; nearly all of their 169 Part D prescriptions were generic (95%). Stryker Corporation was the largest of 8 companies reporting payments in 2025, $25,451 in all, mostly travel and lodging. Lists Northshore University Healthsystem - Evanston Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1396039442 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 7, 2011 |
| Last updated in NPPES | Jul 8, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Neurological Surgery Primary | 207T00000X | 036148890 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Neurosurgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 277 |
|---|---|
| Services billed | 693 across 71 procedure codes |
| Paid by Medicare | $195,894 |
Part D prescriptions in 2024
| Prescriptions (claims) | 169 · 215 30-day fills |
|---|---|
| Patients | 71 |
| Total drug cost | $6,051 |
| Generic share | 95% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Neurosurgery |
| Telehealth | Offers telehealth |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwest Community Hospital 1Arlington Heights, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
- 2025$25,451 · 38 payments from 8 companies
- 2024$3,720 · 16 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $9,972 | 15 |
| Penumbra, Inc. | $7,157 | 9 |
| Scientia Vascular | $6,500 | 6 |
| Medtronic, Inc. | $1,247 | 3 |
| Balt USA, LLC | $270.66 | 1 |
What the 2025 payments were for
- Travel and Lodging$10,860 · 11 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$6,625 · 4 payments
- Consulting Fee$5,685 · 3 payments
- Food and Beverage$2,280 · 20 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Neurological Surgery providers in Evanston
- 1760047138
- 1225138001
- 1306036876