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Home > CA Providers > Diagnostic Radiologists

Dr. John McMahan, MD

(No ratings)

Specializes in: Diagnostic Radiology

3291 Loma Vista Road
Ventura, CA 93003

(805) 652-6556

Dr. John McMahan, MD is a diagnostic radiologist in Ventura, CA specializing in diagnostic radiology.

Office Locations

3291 Loma Vista Road
Ventura, CA 93003

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In The News

“Dr. John R. McMahan III, director of radiology at the county hospital, discussed a series of X-rays taken of Joselin in July 1994.”—"2 Doctors Testify on Toddler's Death", Los Angeles Times, November 1997

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2012 were X-rays, thoracic (chest) imaging, musculoskeletal imaging and pelvic imaging.

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

abdominal imaging	91
CT scan	72
hip imaging	29
musculoskeletal imaging	118
pelvic imaging	104
spinal procedures	55
thoracic (chest) imaging	205
ultrasound (sonogram)	19
X-rays	427

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2013 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

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

abdominal imaging	93
brain imaging (neuroimaging)	60
breast procedures	26
CT scan	126
hip imaging	12
musculoskeletal imaging	48
pelvic imaging	81
preventive care	26
spinal procedures	29
thoracic (chest) imaging	234
ultrasound (sonogram)	21
women's imaging	26
X-rays	385

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	248
Female	340

**Ethnicity**
Non-Hispanic White	248
Black	0
Hispanic	290
Asian	23
Other	0
Native American	0

**Age**
From 65 to 74	230
From 75 to 84	96
85 and over	54
Less than 65	208

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

Hypertension	67
High Cholesterol	43
Stroke	6
Ischemic Heart Disease	30
Depression	28
Chronic Kidney Disease	28
Asthma	10
Osteoperosis	10
Atrial Fibrilation	10
Heart Failure	19
Chronic Obstructive Pulmonary Disease	15
Diabetes	40
Dementia	11
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2014 were X-rays, thoracic (chest) imaging, CT scan and breast procedures.

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

abdominal imaging	174
brain imaging (neuroimaging)	184
breast procedures	202
CT scan	324
diagnostic imaging	64
hip imaging	53
MRI (magnetic resonance imaging)	53
musculoskeletal imaging	198
neck imaging	14
pelvic imaging	112
preventive care	138
spinal procedures	161
thoracic (chest) imaging	592
ultrasound (sonogram)	93
women's imaging	170
X-rays	1111

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	525
Female	740

**Ethnicity**
Non-Hispanic White	548
Black	45
Hispanic	609
Asian	47
Other	0
Native American	0

**Age**
From 65 to 74	472
From 75 to 84	221
85 and over	92
Less than 65	480

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

Hypertension	64
High Cholesterol	40
Stroke	6
Ischemic Heart Disease	26
Depression	31
Chronic Kidney Disease	27
Asthma	9
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	17
Chronic Obstructive Pulmonary Disease	13
Diabetes	43
Dementia	10
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2015 were X-rays, thoracic (chest) imaging, CT scan and breast procedures.

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

abdominal imaging	224
brain imaging (neuroimaging)	188
breast procedures	305
CT scan	328
diagnostic imaging	118
hip imaging	65
MRI (magnetic resonance imaging)	41
musculoskeletal imaging	208
neck imaging	13
pelvic imaging	145
preventive care	170
spinal procedures	108
thoracic (chest) imaging	555
ultrasound (sonogram)	145
women's imaging	246
X-rays	1158

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	1070
Female	1522

**Ethnicity**
Non-Hispanic White	1096
Black	86
Hispanic	1290
Asian	84
Other	0
Native American	0

**Age**
From 65 to 74	1010
From 75 to 84	420
85 and over	238
Less than 65	924

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

Hypertension	64
High Cholesterol	42
Stroke	7
Ischemic Heart Disease	27
Depression	30
Chronic Kidney Disease	33
Asthma	12
Osteoperosis	10
Atrial Fibrilation	8
Heart Failure	18
Chronic Obstructive Pulmonary Disease	15
Diabetes	41
Dementia	10
Cancer	10

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2016 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

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

abdominal imaging	252
brain imaging (neuroimaging)	198
breast procedures	235
CT scan	389
diagnostic imaging	76
MRI (magnetic resonance imaging)	45
musculoskeletal imaging	146
neck imaging	18
pelvic imaging	147
preventive care	148
spinal procedures	118
thoracic (chest) imaging	618
ultrasound (sonogram)	153
women's imaging	197
X-rays	1043

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	573
Female	841

**Ethnicity**
Non-Hispanic White	580
Black	45
Hispanic	697
Asian	57
Other	19
Native American	16

**Age**
From 65 to 74	589
From 75 to 84	242
85 and over	123
Less than 65	460

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

Hypertension	69
High Cholesterol	46
Stroke	7
Ischemic Heart Disease	30
Depression	31
Chronic Kidney Disease	41
Asthma	22
Osteoperosis	10
Atrial Fibrilation	9
Heart Failure	23
Chronic Obstructive Pulmonary Disease	17
Diabetes	45
Dementia	14
Cancer	10

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2017 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

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

abdominal imaging	198
brain imaging (neuroimaging)	141
CT scan	380
musculoskeletal imaging	47
pelvic imaging	169
spinal procedures	78
thoracic (chest) imaging	1153
ultrasound (sonogram)	35
X-rays	1223

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	816
Female	1004

**Ethnicity**
Non-Hispanic White	1019
Black	131
Hispanic	483
Asian	132
Other	0
Native American	0

**Age**
From 65 to 74	568
From 75 to 84	551
85 and over	419
Less than 65	282

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

Hypertension	75
High Cholesterol	65
Stroke	13
Ischemic Heart Disease	63
Depression	43
Chronic Kidney Disease	63
Asthma	14
Osteoperosis	18
Atrial Fibrilation	18
Heart Failure	52
Chronic Obstructive Pulmonary Disease	35
Diabetes	54
Dementia	39
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2018 were CT scan, brain imaging (neuroimaging), pelvic imaging and abdominal imaging.

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

abdominal imaging	22
brain imaging (neuroimaging)	73
CT scan	95
pelvic imaging	22

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	271
Female	292

**Ethnicity**
Non-Hispanic White	311
Black	46
Hispanic	143
Asian	43
Other	0
Native American	0

**Age**
From 65 to 74	162
From 75 to 84	179
85 and over	132
Less than 65	90

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

Hypertension	75
High Cholesterol	69
Stroke	19
Ischemic Heart Disease	67
Depression	46
Chronic Kidney Disease	73
Asthma	13
Osteoperosis	14
Atrial Fibrilation	23
Heart Failure	63
Chronic Obstructive Pulmonary Disease	43
Diabetes	63
Dementia	47
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2019 were CT scan and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	28
CT scan	28

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	102
Female	126

**Ethnicity**
Non-Hispanic White	123
Black	0
Hispanic	83
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	71
85 and over	40
Less than 65	41

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

Hypertension	75
High Cholesterol	56
Stroke	16
Ischemic Heart Disease	49
Depression	34
Chronic Kidney Disease	57
Asthma	11
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	39
Chronic Obstructive Pulmonary Disease	31
Diabetes	50
Dementia	23
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2020 were CT scan and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	17
CT scan	17

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	97
Female	131

**Ethnicity**
Non-Hispanic White	85
Black	0
Hispanic	100
Asian	30
Other	0
Native American	0

**Age**
From 65 to 74	86
From 75 to 84	62
85 and over	27
Less than 65	53

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

Hypertension	75
High Cholesterol	59
Stroke	7
Ischemic Heart Disease	42
Depression	32
Chronic Kidney Disease	52
Asthma	7
Osteoperosis	14
Atrial Fibrilation	12
Heart Failure	25
Chronic Obstructive Pulmonary Disease	18
Diabetes	41
Dementia	20
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2021 were CT scan, brain imaging (neuroimaging), X-rays and spinal procedures.

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

brain imaging (neuroimaging)	25
CT scan	25
spinal procedures	12
X-rays	12

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	74
Female	114

**Ethnicity**
Non-Hispanic White	71
Black	0
Hispanic	80
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	69
From 75 to 84	54
85 and over	33
Less than 65	32

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

Hypertension	75
High Cholesterol	63
Stroke	10
Ischemic Heart Disease	44
Depression	32
Chronic Kidney Disease	54
Asthma	9
Osteoperosis	14
Atrial Fibrilation	9
Heart Failure	28
Chronic Obstructive Pulmonary Disease	19
Diabetes	52
Dementia	26
Cancer	9

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA during 2022 were CT scan and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	15
CT scan	15

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	54
Female	83

**Ethnicity**
Non-Hispanic White	61
Black	0
Hispanic	60
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	48
From 75 to 84	33
85 and over	31
Less than 65	25

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

Hypertension	75
High Cholesterol	72
Stroke	12
Ischemic Heart Disease	40
Depression	39
Chronic Kidney Disease	34
Asthma	12
Osteoperosis	29
Atrial Fibrilation	20
Heart Failure	29
Chronic Obstructive Pulmonary Disease	26
Diabetes	44
Dementia	18
Cancer	13

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

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

The highest averages for the top procedures that Dr. John McMahan, MD treated as a diagnostic radiologist in Ventura, CA were X-rays, thoracic (chest) imaging, breast procedures and CT scan.

abdominal imaging	150
brain imaging (neuroimaging)	92
breast procedures	192
CT scan	163
diagnostic imaging	86
hip imaging	39
MRI (magnetic resonance imaging)	46
musculoskeletal imaging	127
neck imaging	15
pelvic imaging	111
preventive care	120
spinal procedures	80
thoracic (chest) imaging	559
ultrasound (sonogram)	77
women's imaging	159
X-rays	765

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John McMahan, MD.

**Gender**
Male	348
Female	472

**Ethnicity**
Black / African American	32
Asian / Pacific Islander	40
Non-Hispanic White	376
Native American / Alaskan Native	1
Hispanic	348
Other	1

**Age**
75 to 84	175
85 and over	108
Less than 65	235
65 to 74	300

Average of Total of Conditions of Medicare patients treated by Dr. John McMahan, MD From 2012 - 2022

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

Hypertension	64
High Cholesterol	50
Stroke	9
Ischemic Heart Disease	38
Depression	31
Chronic Kidney Disease	42
Asthma	10
Osteoporosis	12
Heart Failure	28
Chronic Obstructive Pulmonary Disease	21
Diabetes	43
Atrial Fibrillation	11
Dementia	19
Cancer	9

Education & Training

He has a state license in California.

Licensed In: California

Ratings & Reviews

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General Payments

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

**Payments by Company**
Celgene Corporation	$22 Revlimid $22
United Therapeutics Corporation	$18 TYVASO $18

**Types of Payments**
Food and Beverage	$40

Biography

Dr. John McMahan specializes in diagnostic radiology and practices in Ventura, CA. Dr. McMahan is a graduate of the University of Oklahoma College of Medicine.

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Dr. John McMahan, MD

Office Locations

In The News

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

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

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

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

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

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

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

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

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

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

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

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

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

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

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

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

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

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

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

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

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

Average of Total of Conditions of Medicare patients treated by Dr. John McMahan, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Biography

Other Providers in Ventura, CA