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Home > WI Providers > Diagnostic Radiologists

Dr. John J. Warner, MD

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Specializes in: Diagnostic Radiology

1000 N Oak Avenue
Marshfield, WI 54449

(715) 389-3555

Dr. John J. Warner, MD is a diagnostic radiologist in Marshfield, WI specializing in diagnostic radiology.

Office Locations

1000 N Oak Avenue
Marshfield, WI 54449

(715) 389-3555

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Noteworthy Medicare Patient Procedures Performed by Dr. John J. Warner, MD in 2024

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

Top 10%

By Affordability:

spinal procedures

spine imaging

In 2024, Dr. John J. Warner, MD had a list price for spinal procedures, and spine imaging that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Wisconsin. 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 J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2012 were spinal procedures, X-rays, brain imaging (neuroimaging) and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	538
CT scan	444
eye procedures	14
MRI (magnetic resonance imaging)	537
neck imaging	49
sinus imaging	29
spinal procedures	828
thoracic (chest) imaging	127
X-rays	629

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2013 were spinal procedures, brain imaging (neuroimaging), MRI (magnetic resonance imaging) and CT scan.

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

brain imaging (neuroimaging)	407
CT scan	313
MRI (magnetic resonance imaging)	321
neck imaging	23
sinus imaging	19
spinal procedures	444
X-rays	271

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	467
Female	565

**Ethnicity**
Non-Hispanic White	986
Black	0
Hispanic	0
Asian	0
Other	0
Native American	22

**Age**
From 65 to 74	370
From 75 to 84	285
85 and over	125
Less than 65	252

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

Hypertension	66
High Cholesterol	57
Stroke	10
Ischemic Heart Disease	35
Depression	30
Chronic Kidney Disease	33
Asthma	8
Osteoperosis	9
Atrial Fibrilation	13
Heart Failure	20
Chronic Obstructive Pulmonary Disease	16
Diabetes	30
Dementia	14
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2014 were spinal procedures, brain imaging (neuroimaging), X-rays and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	361
breast procedures	11
CT scan	263
MRI (magnetic resonance imaging)	267
neck imaging	17
preventive care	11
sinus imaging	11
spinal procedures	399
women's imaging	11
X-rays	269

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	395
Female	485

**Ethnicity**
Non-Hispanic White	844
Black	0
Hispanic	0
Asian	0
Other	0
Native American	11

**Age**
From 65 to 74	323
From 75 to 84	260
85 and over	121
Less than 65	176

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

Hypertension	65
High Cholesterol	56
Stroke	10
Ischemic Heart Disease	34
Depression	28
Chronic Kidney Disease	33
Asthma	7
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	21
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	13
Cancer	15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2015 were spinal procedures, brain imaging (neuroimaging), CT scan and X-rays.

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

brain imaging (neuroimaging)	504
breast procedures	72
CT scan	460
MRI (magnetic resonance imaging)	401
neck imaging	19
preventive care	72
spinal procedures	639
women's imaging	72
X-rays	411

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	1130
Female	1350

**Ethnicity**
Non-Hispanic White	2384
Black	0
Hispanic	0
Asian	0
Other	28
Native American	30

**Age**
From 65 to 74	934
From 75 to 84	698
85 and over	284
Less than 65	564

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

Hypertension	66
High Cholesterol	56
Stroke	11
Ischemic Heart Disease	33
Depression	31
Chronic Kidney Disease	32
Asthma	14
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	31
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2016 were spinal procedures, X-rays, brain imaging (neuroimaging) and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	377
breast procedures	17
CT scan	296
MRI (magnetic resonance imaging)	332
neck imaging	22
preventive care	17
spinal procedures	630
women's imaging	17
X-rays	444

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	362
Female	550

**Ethnicity**
Non-Hispanic White	868
Black	0
Hispanic	0
Asian	0
Other	20
Native American	11

**Age**
From 65 to 74	346
From 75 to 84	245
85 and over	125
Less than 65	196

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

Hypertension	69
High Cholesterol	54
Stroke	9
Ischemic Heart Disease	35
Depression	33
Chronic Kidney Disease	36
Asthma	22
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	22
Chronic Obstructive Pulmonary Disease	17
Diabetes	30
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2017 were spinal procedures, X-rays, MRI (magnetic resonance imaging) and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	646
CT scan	572
MRI (magnetic resonance imaging)	664
neck imaging	52
sinus imaging	27
spinal procedures	1219
X-rays	768

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	682
Female	812

**Ethnicity**
Non-Hispanic White	1429
Black	0
Hispanic	0
Asian	11
Other	24
Native American	16

**Age**
From 65 to 74	558
From 75 to 84	404
85 and over	182
Less than 65	350

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

Hypertension	64
High Cholesterol	48
Stroke	9
Ischemic Heart Disease	34
Depression	28
Chronic Kidney Disease	35
Asthma	7
Osteoperosis	11
Atrial Fibrilation	15
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	30
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2018 were spinal procedures, X-rays, brain imaging (neuroimaging) and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	591
CT scan	484
MRI (magnetic resonance imaging)	544
neck imaging	63
sinus imaging	13
spinal procedures	978
vascular procedures	22
X-rays	639

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	638
Female	881

**Ethnicity**
Non-Hispanic White	1447
Black	0
Hispanic	0
Asian	15
Other	18
Native American	23

**Age**
From 65 to 74	620
From 75 to 84	409
85 and over	150
Less than 65	340

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

Hypertension	63
High Cholesterol	53
Stroke	8
Ischemic Heart Disease	34
Depression	27
Chronic Kidney Disease	38
Asthma	7
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	19
Chronic Obstructive Pulmonary Disease	21
Diabetes	29
Dementia	12
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2019 were spinal procedures, brain imaging (neuroimaging), MRI (magnetic resonance imaging) and CT scan.

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

brain imaging (neuroimaging)	351
CT scan	262
MRI (magnetic resonance imaging)	296
neck imaging	24
spinal procedures	418
X-rays	256

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	393
Female	453

**Ethnicity**
Non-Hispanic White	808
Black	0
Hispanic	0
Asian	0
Other	13
Native American	12

**Age**
From 65 to 74	339
From 75 to 84	250
85 and over	94
Less than 65	163

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

Hypertension	68
High Cholesterol	57
Stroke	10
Ischemic Heart Disease	35
Depression	30
Chronic Kidney Disease	38
Asthma	7
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	20
Chronic Obstructive Pulmonary Disease	17
Diabetes	29
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2020 were spinal procedures, brain imaging (neuroimaging), CT scan and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	39
CT scan	38
MRI (magnetic resonance imaging)	34
spinal procedures	55
X-rays	22

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	68
Female	83

**Age**
From 65 to 74	61
From 75 to 84	34
85 and over	18
Less than 65	38

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

Hypertension	59
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	32
Depression	31
Chronic Kidney Disease	40
Asthma	8
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	26
Dementia	12
Cancer	12

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2021 were spinal procedures, X-rays, MRI (magnetic resonance imaging) and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	127
CT scan	78
MRI (magnetic resonance imaging)	153
neck imaging	18
spinal procedures	239
X-rays	153

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	210
Female	244

**Ethnicity**
Non-Hispanic White	430
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	196
From 75 to 84	138
85 and over	34
Less than 65	86

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

Hypertension	63
High Cholesterol	57
Stroke	10
Ischemic Heart Disease	32
Depression	28
Chronic Kidney Disease	35
Asthma	5
Osteoperosis	12
Atrial Fibrilation	11
Heart Failure	21
Chronic Obstructive Pulmonary Disease	19
Diabetes	33
Dementia	13
Cancer	15

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2022 were spinal procedures, brain imaging (neuroimaging), X-rays and MRI (magnetic resonance imaging).

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

brain imaging (neuroimaging)	92
CT scan	58
MRI (magnetic resonance imaging)	69
spinal procedures	104
X-rays	69

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	112
Female	138

**Ethnicity**
Non-Hispanic White	231
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	71
85 and over	27
Less than 65	43

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

Hypertension	74
High Cholesterol	71
Stroke	19
Ischemic Heart Disease	29
Depression	29
Chronic Kidney Disease	34
Asthma	9
Osteoperosis	16
Atrial Fibrilation	24
Heart Failure	18
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	10
Cancer	16

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2023 were spinal procedures, CT scan, X-rays and brain imaging (neuroimaging).

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

brain imaging (neuroimaging)	30
CT scan	41
spinal procedures	42
X-rays	31

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	59
Female	76

**Age**
From 65 to 74	51
From 75 to 84	48
85 and over	13
Less than 65	23

Conditions of Medicare patients treated by Dr. John J. Warner, MD in 2023

Hypertension	75
High Cholesterol	73
Stroke	13
Ischemic Heart Disease	28
Depression	32
Chronic Kidney Disease	30
Asthma	13
Osteoperosis	15
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	21
Diabetes	36
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI during 2024 were brain imaging (neuroimaging), X-rays, spinal procedures and CT scan.

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

brain imaging (neuroimaging)	47
CT scan	34
MRI (magnetic resonance imaging)	13
spinal procedures	36
X-rays	36

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Male	73
Female	94

**Ethnicity**
Non-Hispanic White	155
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	59
From 75 to 84	57
85 and over	22
Less than 65	29

Conditions of Medicare patients treated by Dr. John J. Warner, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	18
Ischemic Heart Disease	38
Depression	27
Chronic Kidney Disease	29
Asthma	13
Osteoperosis	25
Atrial Fibrilation	21
Heart Failure	22
Chronic Obstructive Pulmonary Disease	16
Diabetes	31
Dementia	7
Cancer	22

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

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

The highest averages for the top procedures that Dr. John J. Warner, MD treated as a diagnostic radiologist in Marshfield, WI were spinal procedures, brain imaging (neuroimaging), X-rays and MRI (magnetic resonance imaging).

brain imaging (neuroimaging)	316
breast procedures	33
CT scan	257
eye procedures	14
MRI (magnetic resonance imaging)	302
neck imaging	31
preventive care	33
sinus imaging	19
spinal procedures	463
thoracic (chest) imaging	127
vascular procedures	22
women's imaging	33
X-rays	307

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. John J. Warner, MD.

**Gender**
Female	440
Male	353

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	2
Non-Hispanic White	737
Hispanic	0
Native American / Alaskan Native	9
Other	7

**Age**
85 and over	91
75 to 84	223
Less than 65	173
65 to 74	305

Average of Total of Conditions of Medicare patients treated by Dr. John J. Warner, MD From 2012 - 2024

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

Hypertension	62
High Cholesterol	54
Stroke	9
Ischemic Heart Disease	30
Depression	27
Chronic Kidney Disease	31
Asthma	9
Osteoporosis	12
Heart Failure	18
Chronic Obstructive Pulmonary Disease	16
Diabetes	28
Atrial Fibrillation	13
Cancer	13
Dementia	11

Education & Training

He has a state license in Wisconsin.

Licensed In: Wisconsin

Ratings & Reviews

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General Payments

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

**Payments by Company**
Siemens Medical Solutions USA, Inc.	$274 SY - Image and Knowledge Management $173	AX - Angiography Fluoroscopy-Radiology Systems $89	syngo Workflow SLR $12
Toshiba America Medical Systems, Inc.	$19 xr $19
Bayer HealthCare LLC	$13 Gadavist $13
Merge Healthcare Incorporated	$11 Merge Unity $11

**Types of Payments**
Food and Beverage	$318

Research Payments

Dr. John J. Warner, MD has received 1 research payments totaling $75,093.

Biography

Dr. John Warner is a diagnostic radiology specialist in Marshfield, WI. Dr. Warner has obtained a license to practice in Wisconsin.

Select Year:

Dr. John J. Warner, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John J. Warner, MD in 2024

By Affordability:

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 J. Warner, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

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

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

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

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

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

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

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

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

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

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

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

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

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

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

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

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

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

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John J. Warner, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John J. Warner, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. John J. Warner, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Research Payments

Biography

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