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Home > AZ Providers > Behavioral Neurologists & neuropsychiatrists

Dr. Cornelia N. Drees, MD

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Specializes in: Behavioral Neurology & Neuropsychiatry and Neurophysiology

13400 E Shea Boulevard
Scottsdale, AZ 85259

(480) 301-8000

Dr. Cornelia N. Drees, MD is a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ specializing in behavioral neurology & neuropsychiatry and neurophysiology.

Office Locations

13400 E Shea Boulevard
Scottsdale, AZ 85259

(480) 301-8000

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500 W Thomas Road #300a
Phoenix, AZ 85013

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Noteworthy Medicare Patient Procedures Performed by Dr. Cornelia N. Drees, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Volume:

electroencephalography

evoked potential test

needle electromyography of extremity

routine neonatal EEG

In 2024, Dr. Cornelia N. Drees, MD performed more electroencephalography (EEG), evoked potential test, needle electromyography of extremity (arm or leg), and routine neonatal EEG procedures for Medicare patients than 95% of providers in related specialties within Arizona.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2012 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	81
electroencephalography (EEG)	53

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2013 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	146
electroencephalography (EEG)	65

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	63
Female	76

**Ethnicity**
Non-Hispanic White	95
Black	0
Hispanic	19
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	21
From 75 to 84	0
85 and over	0
Less than 65	92

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2013

Hypertension	45
High Cholesterol	26
Stroke	14
Ischemic Heart Disease	24
Depression	52
Chronic Kidney Disease	27
Asthma	10
Osteoperosis	11
Atrial Fibrilation	0
Heart Failure	17
Chronic Obstructive Pulmonary Disease	14
Diabetes	22
Dementia	19
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2014 were electroencephalography (EEG), hospital care and inpatient care.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	220
electroencephalography (EEG)	180
hospital care	44
inpatient care	44

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	103
Female	98

**Ethnicity**
Non-Hispanic White	141
Black	23
Hispanic	20
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	47
From 75 to 84	0
85 and over	0
Less than 65	115

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2014

Hypertension	52
High Cholesterol	38
Stroke	22
Ischemic Heart Disease	28
Depression	42
Chronic Kidney Disease	34
Asthma	11
Osteoperosis	7
Atrial Fibrilation	8
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	22
Dementia	27
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2015 were electroencephalography (EEG), hospital care and inpatient care.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	164
electroencephalography (EEG)	241
hospital care	24
inpatient care	24

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	244
Female	268

**Ethnicity**
Non-Hispanic White	368
Black	54
Hispanic	58
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	148
From 75 to 84	70
85 and over	30
Less than 65	264

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2015

Hypertension	59
High Cholesterol	37
Stroke	25
Ischemic Heart Disease	31
Depression	47
Chronic Kidney Disease	29
Asthma	17
Osteoperosis	7
Atrial Fibrilation	8
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	24
Dementia	28
Cancer	7

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2016 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	152
electroencephalography (EEG)	166

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	104
Female	110

**Ethnicity**
Non-Hispanic White	145
Black	24
Hispanic	31
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	67
From 75 to 84	24
85 and over	13
Less than 65	110

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2016

Hypertension	54
High Cholesterol	38
Stroke	20
Ischemic Heart Disease	29
Depression	49
Chronic Kidney Disease	40
Asthma	19
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	18
Chronic Obstructive Pulmonary Disease	17
Diabetes	25
Dementia	30
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2017 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	122
electroencephalography (EEG)	130

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	81
Female	84

**Ethnicity**
Non-Hispanic White	115
Black	14
Hispanic	17
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	30
From 75 to 84	26
85 and over	13
Less than 65	96

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2017

Hypertension	53
High Cholesterol	25
Stroke	21
Ischemic Heart Disease	31
Depression	46
Chronic Kidney Disease	37
Asthma	7
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	24
Chronic Obstructive Pulmonary Disease	18
Diabetes	24
Dementia	37
Cancer	7

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2018 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	145
electroencephalography (EEG)	109

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	77
Female	83

**Ethnicity**
Non-Hispanic White	114
Black	13
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	0
85 and over	0
Less than 65	95

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2018

Hypertension	48
High Cholesterol	33
Stroke	23
Ischemic Heart Disease	24
Depression	44
Chronic Kidney Disease	30
Asthma	11
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	11
Chronic Obstructive Pulmonary Disease	16
Diabetes	21
Dementia	34
Cancer	7

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2019 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	180
electroencephalography (EEG)	155

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	81
Female	105

**Ethnicity**
Non-Hispanic White	112
Black	25
Hispanic	23
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	48
From 75 to 84	0
85 and over	0
Less than 65	108

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2019

Hypertension	44
High Cholesterol	33
Stroke	11
Ischemic Heart Disease	23
Depression	50
Chronic Kidney Disease	32
Asthma	13
Osteoperosis	8
Atrial Fibrilation	7
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	23
Dementia	31
Cancer	8

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2020 were electroencephalography (EEG).

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	63
electroencephalography (EEG)	19

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	66
Female	72

**Ethnicity**
Non-Hispanic White	91
Black	19
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	38
From 75 to 84	0
85 and over	0
Less than 65	72

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2020

Hypertension	52
High Cholesterol	36
Stroke	19
Ischemic Heart Disease	31
Depression	38
Chronic Kidney Disease	39
Asthma	9
Osteoperosis	11
Atrial Fibrilation	0
Heart Failure	22
Chronic Obstructive Pulmonary Disease	12
Diabetes	28
Dementia	28
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2021 were electroencephalography (EEG) and evoked potential test.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

doctor visit	33
electroencephalography (EEG)	90
evoked potential test	29

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	110
Female	102

**Ethnicity**
Non-Hispanic White	187
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	84
From 75 to 84	78
85 and over	21
Less than 65	29

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2021

Hypertension	70
High Cholesterol	65
Stroke	28
Ischemic Heart Disease	37
Depression	36
Chronic Kidney Disease	44
Asthma	6
Osteoperosis	16
Atrial Fibrilation	17
Heart Failure	20
Chronic Obstructive Pulmonary Disease	11
Diabetes	28
Dementia	29
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2022 were electroencephalography (EEG), evoked potential test and diagnostic procedures.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

diagnostic procedures	13
doctor visit	84
electroencephalography (EEG)	95
evoked potential test	37

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	116
Female	126

**Ethnicity**
Non-Hispanic White	216
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	92
85 and over	20
Less than 65	28

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2022

Hypertension	73
High Cholesterol	75
Stroke	38
Ischemic Heart Disease	32
Depression	36
Chronic Kidney Disease	31
Asthma	12
Osteoperosis	19
Atrial Fibrilation	23
Heart Failure	21
Chronic Obstructive Pulmonary Disease	18
Diabetes	30
Dementia	21
Cancer	18

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2023 were electroencephalography (EEG), evoked potential test and diagnostic procedures.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

diagnostic procedures	12
doctor visit	62
electroencephalography (EEG)	89
evoked potential test	61

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	124
Female	115

**Ethnicity**
Non-Hispanic White	197
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	103
From 75 to 84	81
85 and over	24
Less than 65	31

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	35
Ischemic Heart Disease	28
Depression	36
Chronic Kidney Disease	32
Asthma	14
Osteoperosis	18
Atrial Fibrilation	21
Heart Failure	19
Chronic Obstructive Pulmonary Disease	13
Diabetes	29
Dementia	20
Cancer	20

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ during 2024 were electroencephalography (EEG), evoked potential test and diagnostic procedures.

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

diagnostic procedures	27
doctor visit	104
electroencephalography (EEG)	112
evoked potential test	85

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Male	160
Female	163

**Ethnicity**
Non-Hispanic White	268
Black	14
Hispanic	16
Asian	0
Other	12
Native American	0

**Age**
From 65 to 74	144
From 75 to 84	114
85 and over	25
Less than 65	40

Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD in 2024

Hypertension	74
High Cholesterol	75
Stroke	33
Ischemic Heart Disease	31
Depression	35
Chronic Kidney Disease	30
Asthma	13
Osteoperosis	18
Atrial Fibrilation	26
Heart Failure	20
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Dementia	21
Cancer	22

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Cornelia N. Drees, MD for Medicare patients.

The highest averages for the top procedures that Dr. Cornelia N. Drees, MD treated as a neuropsychiatrist / behavioral neurologist in Scottsdale, AZ were electroencephalography (EEG), evoked potential test, hospital care and inpatient care.

diagnostic procedures	17
doctor visit	119
electroencephalography (EEG)	115
evoked potential test	53
hospital care	34
inpatient care	34

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Cornelia N. Drees, MD.

**Gender**
Female	107
Male	102

**Ethnicity**
Black / African American	14
Asian / Pacific Islander	0
Non-Hispanic White	157
Hispanic	17
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	11
75 to 84	37
Less than 65	83
65 to 74	67

Average of Total of Conditions of Medicare patients treated by Dr. Cornelia N. Drees, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Cornelia N. Drees, MD treated were hypertension, high cholesterol, depression and chronic kidney disease.

Hypertension	53
High Cholesterol	42
Stroke	22
Ischemic Heart Disease	26
Depression	39
Chronic Kidney Disease	31
Asthma	10
Osteoporosis	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	13
Diabetes	23
Atrial Fibrillation	11
Cancer	9
Dementia	25

Education & Training

She has a state license in Arizona.

Licensed In: Arizona

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Cornelia N. Drees, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
NeuroPace, Inc.	$4,988 RNS System $3,430	RNSSystem $1,558
Cyberonics, Inc.	$1,408 VNS Therapy $1,408
Medtronic USA, Inc.	$401 ACTIVA $330	VISUALASE $71

**Types of Payments**
Travel and Lodging	$2,564
Education	$2,400
Food and Beverage	$1,833

Research Payments

Dr. Cornelia N. Drees, MD has received 174 research payments totaling $665,084.

Biography

Dr. Cornelia Drees, who practices in Scottsdale, AZ and Phoenix, AZ, is a medical specialist in neurophysiology and behavioral neurology & neuropsychiatry. Her areas of expertise include devices, neurostimulation, and seizures. Before completing her residency at Cleveland Clinic and a hospital affiliated with State University of New York (SUNY), Dr. Drees attended medical school at the University of Cologne Faculty of Medicine. She has received distinctions including Top Doctor Epilepsy; Top Doctor Epilepsy - 5280 Denver, Denver, Colorado Regional Magazine; and Nominated by peers for Full-Time Physician of the Year - University of Colorado Hospital. Dr. Drees is professionally affiliated with Mayo Clinic.