Dr. Cornelia N. Drees, M.D.
Neurology (Epilepsy Physician)
13400 E Shea Blvd
Scottsdale, AZ 85259
Who else practices at this address →
Maricopa County includes primary care (13% of residents) and dental (0% of residents) and mental health (4% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Years since graduation
- 33
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 323
Licensed in Colorado since 2008, according to the Colorado Department of Regulatory Agencies. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Epilepsy Physician primary
AZ license 35108 -
Clinical Neurophysiology Physician
CO license DR.0046266 (first issued 2008; active) -
Neurology Physician
AZ license 35108 · CO license 46266 (first issued 2008; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Mayo Clinic Hospital Phoenix, AZ
Medical groups
- Mayo Clinic Arizona (1,626 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 323
- Services billed
- 1,094
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby), per patient, (attention directed exclusively to one patient) each 15 minutes (list in addition to primary procedure) | 224 | 23 |
| Measurement of brain wave activity with video (veeg), 12-26 hours with review and report by health care professional | 77 | 43 |
| Measurement of brain wave activity (eeg), 41-60 minutes | 70 | 70 |
| Continuous monitoring of nervous system during operation, each 15 minutes | 63 | 14 |
| Measurement of brain wave activity with video (veeg), 2-12 hours with review and report by health care professional | 43 | 41 |
| Established patient office or other outpatient visit, 30-39 minutes | 42 | 38 |
| Placement of skin electrodes and measurement of stimulated sites on arms and legs | 33 | 33 |
| Measurement of brain wave activity (eeg), 12-26 hours | 28 | 17 |
| Placement of skin electrodes and measurement of central motor stimulation in arms and legs | 28 | 28 |
| Established patient office or other outpatient visit, 40-54 minutes | 20 | 20 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Xcopri (cenobamate) | 40 |
| Lacosamide Other prescribers in Scottsdale, AZ | 32 |
| Lamotrigine Er (lamotrigine) Other prescribers in Scottsdale, AZ | 26 |
| Levetiracetam Other prescribers in Scottsdale, AZ | 25 |
| Levetiracetam Er (levetiracetam) Other prescribers in Scottsdale, AZ | 24 |
| Escitalopram Oxalate Other prescribers in Scottsdale, AZ | 17 |
| Lamotrigine Other prescribers in Scottsdale, AZ | 15 |
| Clobazam | 15 |
| Nayzilam (midazolam) | 14 |
| Gabapentin Other prescribers in Scottsdale, AZ | 13 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Industry-funded research
Named as a principal investigator on 1 industry-funded study in 2025, from 1 company. The companies reported $12,088 in research payments for these studies, mostly to the institutions running them.
- Post Approval Study
Neuropace, Inc.
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.