William Ares, MD
NPI 1396039442 · Neurological Surgery Physician · Evanston, IL
Enrolled with Medicare as Practitioner - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ares, MD is a Neurological Surgery Physician provider in Evanston, IL (NPI 1396039442).
Provider details
- NPI number
- 1396039442
- Entity type
- Individual
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036148890 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
556 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 71 | $142 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 52 | $102 |
| Insertion of Tube Into Internal Neck Artery for Diagnosis Or Treatment With Review By Radiologist36224 | 45 | $365 |
| Imaging of Blood Vessel75898 | 39 | $103 |
| Review By Radiologist of Image for Insertion of Material to Block Blood Flow75894 | 38 | $80 |
| Occlusion of Central Nervous System Or Spinal Cord Artery61624 | 36 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methylprednisolone | 30 | 25 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 21 | — |
| Gabapentin | 18 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 15 | 11 |
| Amlodipine Besylate | 12 | — |
| Cyclobenzaprine Hcl | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,720 across 14 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-06-07
- Last updated
- 2019-07-08
Frequently asked questions
- What is William Ares's NPI number?
- William Ares's National Provider Identifier (NPI) is 1396039442, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ares's specialty?
- William Ares is listed in the NPPES registry with a primary specialty of Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is William Ares located?
- William Ares's practice location on file with NPPES is 1000 Central St Ste 880, Evanston, IL 60201.
- What is William Ares's phone number?
- The practice phone number listed in the NPPES registry for William Ares is (847) 570-1440.
- Does William Ares accept Medicare?
- William Ares is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ares's NPI active?
- Yes — William Ares's NPI (1396039442) is active in the NPPES registry as of the last update on 2019-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.