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Dr. John P. Karis, MD

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Specializes in: Diagnostic Radiology and Neuroradiology

Duke University School of Medicine (1987)

Professional interests include: diagnostic imaging, cerebral (brain) angiogram, CT scan, and more.

350 West Thomas Road
Phoenix, AZ 85013

(602) 406-7783

Dr. John P. Karis, MD is a diagnostic radiologist in Phoenix, AZ specializing in diagnostic radiology and neuroradiology. He graduated from Duke University School of Medicine in 1987 and has 39 years of experience. Dr. John P. Karis, MD is affiliated with Dignity Health and Barrow Neurological Institute.

Office Locations

Barrow Neurological Institute

350 West Thomas Road
Phoenix, AZ 85013

(602) 406-7783

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Noteworthy Medicare Patient Procedures Performed by Dr. John P. Karis, MD in 2023

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

Top 25%

By Volume:

brain imaging

MRI

By Affordability:

CT scan

maxillofacial CT scan

In 2012, among providers in related specialties within Arizona, Dr. John P. Karis, MD performed more brain imaging (neuroimaging), and MRI (magnetic resonance imaging) procedures for Medicare patients than 75% of them and he also had a list price for CT scan, and maxillofacial (jaw/face) CT scan that was lower than the list prices billed to Medicare by 75% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2012 were brain imaging (neuroimaging), CT scan, MRI (magnetic resonance imaging) and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	772
CT scan	580
diagnostic procedures	17
lab tests	13
MRI (magnetic resonance imaging)	514
neck imaging	36
nuclear scan	18
spinal procedures	411
vascular procedures	86

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2013 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	957
CT scan	521
diagnostic procedures	17
lab tests	14
MRI (magnetic resonance imaging)	736
neck imaging	56
spinal procedures	346
vascular procedures	101

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	482
Female	532

**Ethnicity**
Non-Hispanic White	798
Black	53
Hispanic	113
Asian	0
Other	0
Native American	25

**Age**
From 65 to 74	435
From 75 to 84	286
85 and over	96
Less than 65	197

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2013

Hypertension	75
High Cholesterol	58
Stroke	29
Ischemic Heart Disease	38
Depression	30
Chronic Kidney Disease	29
Asthma	9
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	20
Cancer	15

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2014 were brain imaging (neuroimaging), CT scan, MRI (magnetic resonance imaging) and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1037
CT scan	712
diagnostic procedures	28
lab tests	45
MRI (magnetic resonance imaging)	701
neck imaging	64
spinal procedures	432
vascular procedures	72

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	539
Female	554

**Ethnicity**
Non-Hispanic White	849
Black	58
Hispanic	118
Asian	13
Other	26
Native American	29

**Age**
From 65 to 74	476
From 75 to 84	294
85 and over	81
Less than 65	242

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2014

Hypertension	71
High Cholesterol	54
Stroke	25
Ischemic Heart Disease	36
Depression	33
Chronic Kidney Disease	27
Asthma	9
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	15
Chronic Obstructive Pulmonary Disease	16
Diabetes	32
Dementia	19
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2015 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1077
CT scan	625
diagnostic procedures	33
eye procedures	12
lab tests	48
MRI (magnetic resonance imaging)	848
neck imaging	75
spinal procedures	466
vascular procedures	98

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	1122
Female	1136

**Ethnicity**
Non-Hispanic White	1800
Black	118
Hispanic	218
Asian	36
Other	24
Native American	62

**Age**
From 65 to 74	1038
From 75 to 84	602
85 and over	178
Less than 65	440

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2015

Hypertension	73
High Cholesterol	57
Stroke	26
Ischemic Heart Disease	37
Depression	32
Chronic Kidney Disease	32
Asthma	14
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	15
Diabetes	34
Dementia	19
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2016 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1484
CT scan	947
diagnostic procedures	26
lab tests	33
MRI (magnetic resonance imaging)	977
neck imaging	100
spinal procedures	587
vascular procedures	204

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	709
Female	774

**Ethnicity**
Non-Hispanic White	1179
Black	66
Hispanic	144
Asian	20
Other	23
Native American	51

**Age**
From 65 to 74	671
From 75 to 84	425
85 and over	121
Less than 65	266

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2016

Hypertension	73
High Cholesterol	56
Stroke	25
Ischemic Heart Disease	40
Depression	34
Chronic Kidney Disease	38
Asthma	22
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	27
Chronic Obstructive Pulmonary Disease	18
Diabetes	33
Dementia	24
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2017 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1221
CT scan	719
diagnostic procedures	17
lab tests	48
MRI (magnetic resonance imaging)	942
neck imaging	106
spinal procedures	538
vascular procedures	166
X-rays	12

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	700
Female	702

**Ethnicity**
Non-Hispanic White	1120
Black	61
Hispanic	138
Asian	13
Other	28
Native American	42

**Age**
From 65 to 74	628
From 75 to 84	424
85 and over	118
Less than 65	232

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2017

Hypertension	72
High Cholesterol	53
Stroke	22
Ischemic Heart Disease	41
Depression	31
Chronic Kidney Disease	38
Asthma	10
Osteoperosis	11
Atrial Fibrilation	15
Heart Failure	27
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	24
Cancer	14

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2018 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1240
CT scan	818
lab tests	38
MRI (magnetic resonance imaging)	895
neck imaging	102
spinal procedures	492
vascular procedures	143

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	659
Female	678

**Ethnicity**
Non-Hispanic White	1026
Black	61
Hispanic	151
Asian	19
Other	38
Native American	42

**Age**
From 65 to 74	602
From 75 to 84	395
85 and over	119
Less than 65	221

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2018

Hypertension	75
High Cholesterol	58
Stroke	25
Ischemic Heart Disease	40
Depression	34
Chronic Kidney Disease	40
Asthma	11
Osteoperosis	11
Atrial Fibrilation	14
Heart Failure	29
Chronic Obstructive Pulmonary Disease	17
Diabetes	34
Dementia	23
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2019 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	1196
CT scan	790
diagnostic procedures	36
eye procedures	12
lab tests	28
MRI (magnetic resonance imaging)	904
neck imaging	124
spinal procedures	566
vascular procedures	168

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	649
Female	677

**Ethnicity**
Non-Hispanic White	1020
Black	59
Hispanic	162
Asian	20
Other	31
Native American	34

**Age**
From 65 to 74	638
From 75 to 84	383
85 and over	120
Less than 65	185

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2019

Hypertension	75
High Cholesterol	64
Stroke	27
Ischemic Heart Disease	46
Depression	37
Chronic Kidney Disease	43
Asthma	12
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	28
Chronic Obstructive Pulmonary Disease	19
Diabetes	33
Dementia	23
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2020 were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	868
CT scan	545
MRI (magnetic resonance imaging)	670
neck imaging	68
spinal procedures	358
vascular procedures	96

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	439
Female	474

**Ethnicity**
Non-Hispanic White	709
Black	36
Hispanic	97
Asian	0
Other	0
Native American	37

**Age**
From 65 to 74	455
From 75 to 84	288
85 and over	63
Less than 65	107

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2020

Hypertension	75
High Cholesterol	64
Stroke	30
Ischemic Heart Disease	48
Depression	36
Chronic Kidney Disease	42
Asthma	11
Osteoperosis	11
Atrial Fibrilation	16
Heart Failure	24
Chronic Obstructive Pulmonary Disease	16
Diabetes	36
Dementia	23
Cancer	16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2021 were brain imaging (neuroimaging), CT scan, MRI (magnetic resonance imaging) and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	890
CT scan	652
MRI (magnetic resonance imaging)	585
neck imaging	72
spinal procedures	378
vascular procedures	101

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	506
Female	467

**Ethnicity**
Non-Hispanic White	763
Black	39
Hispanic	87
Asian	17
Other	27
Native American	40

**Age**
From 65 to 74	464
From 75 to 84	326
85 and over	83
Less than 65	100

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2021

Hypertension	75
High Cholesterol	67
Stroke	29
Ischemic Heart Disease	50
Depression	36
Chronic Kidney Disease	48
Asthma	11
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	22
Chronic Obstructive Pulmonary Disease	17
Diabetes	35
Dementia	24
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2022 were brain imaging (neuroimaging), CT scan, MRI (magnetic resonance imaging) and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	948
CT scan	704
MRI (magnetic resonance imaging)	689
neck imaging	76
spinal procedures	434
vascular procedures	85

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	507
Female	528

**Ethnicity**
Non-Hispanic White	798
Black	40
Hispanic	103
Asian	19
Other	36
Native American	39

**Age**
From 65 to 74	466
From 75 to 84	386
85 and over	97
Less than 65	86

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	37
Ischemic Heart Disease	33
Depression	32
Chronic Kidney Disease	32
Asthma	14
Osteoperosis	17
Atrial Fibrilation	23
Heart Failure	18
Chronic Obstructive Pulmonary Disease	18
Diabetes	33
Dementia	19
Cancer	18

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ during 2023 were brain imaging (neuroimaging), CT scan, MRI (magnetic resonance imaging) and spinal procedures.

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

brain imaging (neuroimaging)	900
CT scan	721
MRI (magnetic resonance imaging)	588
neck imaging	34
spinal procedures	419
vascular procedures	64

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Male	467
Female	464

**Ethnicity**
Non-Hispanic White	711
Black	47
Hispanic	91
Asian	16
Other	25
Native American	41

**Age**
From 65 to 74	400
From 75 to 84	374
85 and over	75
Less than 65	82

Conditions of Medicare patients treated by Dr. John P. Karis, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	40
Ischemic Heart Disease	34
Depression	32
Chronic Kidney Disease	31
Asthma	14
Osteoperosis	18
Atrial Fibrilation	23
Heart Failure	17
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	18
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. John P. Karis, MD for Medicare patients.

The highest averages for the top procedures that Dr. John P. Karis, MD treated as a diagnostic radiologist in Phoenix, AZ were brain imaging (neuroimaging), MRI (magnetic resonance imaging), CT scan and spinal procedures.

brain imaging (neuroimaging)	1049
CT scan	694
diagnostic procedures	24
eye procedures	12
lab tests	33
MRI (magnetic resonance imaging)	754
neck imaging	76
nuclear scan	18
spinal procedures	452
vascular procedures	115
X-rays	12

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. John P. Karis, MD.

**Gender**
Female	582
Male	564

**Ethnicity**
Black / African American	53
Asian / Pacific Islander	14
Non-Hispanic White	897
Native American / Alaskan Native	36
Hispanic	118
Other	21

**Age**
75 to 84	348
85 and over	95
Less than 65	179
65 to 74	522

Average of Total of Conditions of Medicare patients treated by Dr. John P. Karis, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. John P. Karis, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	67
High Cholesterol	56
Stroke	26
Ischemic Heart Disease	36
Depression	30
Chronic Kidney Disease	33
Asthma	11
Osteoporosis	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Atrial Fibrillation	14
Dementia	19
Cancer	13

Education & Training

Dr. John P. Karis, MD graduated from Duke University School of Medicine in 1987. He completed residency at North Carolina Memorial Hospital. He is certified by the Board Certification: Radiology (Sub: Nuclear Radiology) and has a state license in Arizona.

Medical School: Duke University School of Medicine (1987)

Residency: North Carolina Memorial Hospital

Board Certification: Board Certification: Radiology (Sub: Nuclear Radiology)

Licensed In: Arizona

Affiliations & Hospitals

Dr. John P. Karis, MD is associated with these hospitals and organizations:

Dignity Health

Barrow Neurological Institute

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General Payments

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

**Payments by Company**
Philips Electronics North America Corporation	$7,895 MR-RT $4,754	Magnetic Resonance Imaging Equipment $2,069	DI Und Service $819	MRI Premium_High SV $127	DI Undivided Equipment $85	Other $41
BRACCO DIAGNOSTICS INC.	$3,686 Contrast Imaging $2,594	VUEWAY $1,000	MULTIHANCE $92
Biogen, Inc.	$3,051 SPINRAZA $3,051
GUERBET LLC	$2,564 DOTAREM $2,564
GE Healthcare	$289 $289
Other	$337 Fycompa $45	Banzel $35	CLINICAL TRIAL PRODUCT $20	Image Guided Surgery Products $20	GENERAL - PAIN MANAGEMENT $16	Other $200

**Types of Payments**
Consulting Fee	$7,338
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$4,580
Travel and Lodging	$2,285
Honoraria	$2,000
Food and Beverage	$1,592
Other	$28

Research Payments

Dr. John P. Karis, MD has received 3 research payments totaling $8,510.

Biography

Dr. John Karis' areas of specialization are neuroradiology and diagnostic radiology. He has indicated that his clinical interests include MRI (magnetic resonance imaging), diagnostic imaging, and neuroradiology. He attended Duke University School of Medicine and subsequently trained at North Carolina Memorial Hospital and Duke University Hospital for residency. Dr. Karis has received distinctions including National Science and Humanities Scholarship Winner and Westinghouse Science Talent Search Scholarship Winner. He is professionally affiliated with Barrow Neurological Institute. According to Dignity Health, new patients are welcome to contact Dr. Karis's office in.