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Dr. Thomas Mark Johnson, MD

Accepting New Patients

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Specializes in: Adult Cardiology

Professional interests include: heart problems

1000 Langworthy Street
Dubuque, IA 52001

(563) 584-3425

Dr. Thomas Mark Johnson, MD is a cardiologist in Dubuque, IA specializing in adult cardiology. Dr. Thomas Mark Johnson, MD is affiliated with MercyOne.

Office Locations

1000 Langworthy Street
Dubuque, IA 52001

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Some issues Dr. Thomas Mark Johnson, MD can help you with:

Heart Problems

The heart is one of the most important organs in the body. This smooth muscle expands and contracts rhythmically an entire lifetime, pumping blood to the lungs and then to every other cell in the body. When heart problems occur, it becomes difficult for the body to get the nutrients and oxygen it needs via the blood. So while there are a variety of illnesses and disorders that affect the heart, most of them cause weakness, exhaustion and shortness of breath. The most common heart conditions include heart disease, angina, arrhythmia, and valve disorders.

Heart disease is the leading cause of death in the United States for both men and women. This includes coronary artery disease, heart attacks, congestive heart failure, and congenital heart disease. Some conditions, such as genetics, cannot be controlled. But there are many other things one can do to lower their risk for heart disease. Controlling high blood pressure and cholesterol levels, reducing or stopping smoking, exercising more and losing weight if needed, and eating a diet low in sodium can all protect the heart.

Angina is a squeezing type of chest pain that happens when the muscles around the heart don't get enough oxygen. It can be regular or infrequent. Usually, angina is caused by coronary heart disease. However, not all chest pain is angina. Chest pain can also be caused by a lung infection or panic attack, for example, so it is important to have any sudden pain checked.

Arrhythmia is the word for when the heart beats too fast, too slow, or irregularly with skipped beats. It can feel frightening, and depending on the type it can be dangerous, but in most cases arrhythmia is not serious and can be treated. It is very common, especially in older adults.

Heart valve problems can happen in any one of the the heart's four valves that keep blood flowing where it needs to go. Babies can be born with problems in their heart valves, or valves can be damaged by infections. The valves can stiffen and become less mobile, or they can stop closing properly and 'leak' when the heart beats. Valve problems can usually be repaired surgically.

Noteworthy Medicare Patient Procedures Performed by Dr. Thomas Mark Johnson, MD in 2023

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

Top 5%

By Affordability:

blood urea nitrogen test

complete blood count

creatinine blood test

inpatient hospital care

kidney function tests

sodium blood test

sodium test

In 2023, Dr. Thomas Mark Johnson, MD had a list price for blood urea nitrogen (BUN) test, complete blood count (CBC), creatinine blood test, creatinine test, electrolyte panel, electrolyte test, hospital care, inpatient care, inpatient hospital care (for patient admitted to hospital), kidney function tests, sodium blood test, and sodium test that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Iowa. 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.

Top 10%

By Affordability:

blood count tests

In 2023, Dr. Thomas Mark Johnson, MD had a list price for blood count tests that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Iowa. 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.

Top 25%

By Volume:

stress echo

In 2012, Dr. Thomas Mark Johnson, MD performed more stress echo procedures for Medicare patients than 75% of providers in related specialties within Iowa.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2012 were cardiac procedures, lab tests, ultrasound (sonogram) and hospital care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	14
blood draw	86
cardiac procedures	379
catheterization	65
diagnostic procedures	34
doctor visit	520
hospital care	284
inpatient care	265
lab tests	333
minimally invasive procedures	65
outpatient care	19
preventive care	16
stent placement (stenting)	31
stress testing	63
thoracic (chest) imaging	45
ultrasound (sonogram)	300
vascular procedures	34
X-rays	45

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2013 were cardiac procedures, ultrasound (sonogram), hospital care and lab tests.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	23
angioplasty	46
blood draw	102
cardiac procedures	592
cardioversion	16
catheterization	135
diagnostic procedures	50
doctor visit	582
emergency care	16
hospital care	358
implant surgery	15
inpatient care	342
lab tests	355
minimally invasive procedures	150
outpatient care	16
stent placement (stenting)	46
stress testing	68
thoracic (chest) imaging	54
ultrasound (sonogram)	419
vascular procedures	50
X-rays	54

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	656
Female	593

**Ethnicity**
Non-Hispanic White	1234
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	444
From 75 to 84	476
85 and over	216
Less than 65	113

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2013

Hypertension	70
High Cholesterol	64
Stroke	6
Ischemic Heart Disease	46
Depression	17
Chronic Kidney Disease	22
Asthma	5
Osteoperosis	5
Atrial Fibrilation	27
Heart Failure	29
Chronic Obstructive Pulmonary Disease	14
Diabetes	32
Dementia	11
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2014 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	20
angioplasty	34
blood draw	109
cardiac procedures	517
cardioversion	25
catheterization	119
diagnostic procedures	43
doctor visit	543
emergency care	25
hospital care	399
implant surgery	14
inpatient care	385
lab tests	311
minimally invasive procedures	133
outpatient care	14
stent placement (stenting)	34
stress testing	67
thoracic (chest) imaging	57
ultrasound (sonogram)	351
vascular procedures	56
X-rays	57

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	611
Female	553

**Ethnicity**
Non-Hispanic White	1138
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	442
From 75 to 84	414
85 and over	230
Less than 65	78

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2014

Hypertension	71
High Cholesterol	62
Stroke	9
Ischemic Heart Disease	47
Depression	17
Chronic Kidney Disease	24
Asthma	4
Osteoperosis	4
Atrial Fibrilation	30
Heart Failure	32
Chronic Obstructive Pulmonary Disease	15
Diabetes	34
Dementia	11
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2015 were cardiac procedures, ultrasound (sonogram), lab tests and hospital care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	30
blood draw	78
cardiac procedures	414
cardioversion	16
catheterization	39
diagnostic procedures	24
doctor visit	495
emergency care	15
hospital care	186
implant surgery	12
inpatient care	175
lab tests	229
minimally invasive procedures	51
outpatient care	11
stress testing	84
thoracic (chest) imaging	40
ultrasound (sonogram)	317
vascular procedures	40
X-rays	40

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	966
Female	812

**Ethnicity**
Non-Hispanic White	1736
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	640
From 75 to 84	652
85 and over	364
Less than 65	122

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2015

Hypertension	75
High Cholesterol	63
Stroke	10
Ischemic Heart Disease	53
Depression	19
Chronic Kidney Disease	26
Asthma	8
Osteoperosis	5
Atrial Fibrilation	35
Heart Failure	34
Chronic Obstructive Pulmonary Disease	13
Diabetes	36
Dementia	12
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2016 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	14
cardiac procedures	380
catheterization	34
diagnostic procedures	17
doctor visit	390
emergency care	17
hospital care	216
implant surgery	14
inpatient care	216
minimally invasive procedures	48
stress testing	69
ultrasound (sonogram)	297
vascular procedures	38

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	393
Female	363

**Ethnicity**
Non-Hispanic White	731
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	287
From 75 to 84	275
85 and over	153
Less than 65	41

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2016

Hypertension	75
High Cholesterol	65
Stroke	7
Ischemic Heart Disease	53
Depression	22
Chronic Kidney Disease	35
Asthma	17
Osteoperosis	6
Atrial Fibrilation	33
Heart Failure	36
Chronic Obstructive Pulmonary Disease	15
Diabetes	34
Dementia	14
Cancer	12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2017 were cardiac procedures, ultrasound (sonogram), lab tests and inpatient care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	22
blood draw	70
cardiac procedures	396
catheterization	33
diagnostic procedures	22
doctor visit	393
emergency care	11
hospital care	166
implant surgery	12
inpatient care	166
lab tests	209
minimally invasive procedures	45
stress testing	74
thoracic (chest) imaging	43
ultrasound (sonogram)	314
vascular procedures	37
X-rays	43

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	415
Female	323

**Ethnicity**
Non-Hispanic White	718
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	282
From 75 to 84	246
85 and over	159
Less than 65	51

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2017

Hypertension	73
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	51
Depression	20
Chronic Kidney Disease	35
Asthma	5
Osteoperosis	5
Atrial Fibrilation	31
Heart Failure	36
Chronic Obstructive Pulmonary Disease	14
Diabetes	34
Dementia	13
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2018 were cardiac procedures, ultrasound (sonogram), lab tests and hospital care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	16
angioplasty	34
blood draw	54
cardiac procedures	435
catheterization	77
diagnostic procedures	15
doctor visit	332
emergency care	11
hospital care	160
implant surgery	18
inpatient care	148
lab tests	197
minimally invasive procedures	95
outpatient care	12
stent placement (stenting)	34
stress testing	52
ultrasound (sonogram)	302
vascular procedures	37

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	373
Female	316

**Ethnicity**
Non-Hispanic White	668
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	270
From 75 to 84	215
85 and over	150
Less than 65	54

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2018

Hypertension	75
High Cholesterol	70
Stroke	6
Ischemic Heart Disease	50
Depression	21
Chronic Kidney Disease	35
Asthma	5
Osteoperosis	8
Atrial Fibrilation	29
Heart Failure	39
Chronic Obstructive Pulmonary Disease	15
Diabetes	32
Dementia	12
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2019 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	13
blood draw	60
cardiac procedures	394
cardioversion	15
doctor visit	335
hospital care	187
implant surgery	18
inpatient care	187
lab tests	162
minimally invasive procedures	18
stress testing	66
ultrasound (sonogram)	345
vascular procedures	18

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	395
Female	327

**Ethnicity**
Non-Hispanic White	689
Black	0
Hispanic	0
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	282
From 75 to 84	248
85 and over	137
Less than 65	55

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2019

Hypertension	74
High Cholesterol	70
Stroke	7
Ischemic Heart Disease	46
Depression	24
Chronic Kidney Disease	34
Asthma	7
Osteoperosis	8
Atrial Fibrilation	30
Heart Failure	35
Chronic Obstructive Pulmonary Disease	14
Diabetes	30
Dementia	15
Cancer	12

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2020 were cardiac procedures, ultrasound (sonogram), lab tests and hospital care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	18
angioplasty	36
blood draw	48
cardiac procedures	383
catheterization	65
diagnostic procedures	11
doctor visit	268
hospital care	127
implant surgery	14
inpatient care	115
lab tests	172
minimally invasive procedures	79
outpatient care	12
stent placement (stenting)	36
stress testing	45
ultrasound (sonogram)	275
vascular procedures	22

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	357
Female	310

**Ethnicity**
Non-Hispanic White	644
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	254
From 75 to 84	230
85 and over	135
Less than 65	48

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2020

Hypertension	73
High Cholesterol	69
Stroke	7
Ischemic Heart Disease	47
Depression	24
Chronic Kidney Disease	32
Asthma	4
Osteoperosis	8
Atrial Fibrilation	30
Heart Failure	37
Chronic Obstructive Pulmonary Disease	12
Diabetes	31
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2021 were cardiac procedures, ultrasound (sonogram), lab tests and inpatient care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	19
angioplasty	28
blood draw	78
cardiac procedures	476
cardioversion	16
catheterization	59
diagnostic procedures	17
doctor visit	313
hospital care	201
implant surgery	17
inpatient care	201
lab tests	235
minimally invasive procedures	76
stent placement (stenting)	28
stress testing	36
ultrasound (sonogram)	367
vascular procedures	31

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	372
Female	335

**Ethnicity**
Non-Hispanic White	686
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	290
From 75 to 84	237
85 and over	135
Less than 65	45

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2021

Hypertension	75
High Cholesterol	72
Stroke	7
Ischemic Heart Disease	49
Depression	24
Chronic Kidney Disease	34
Asthma	5
Osteoperosis	9
Atrial Fibrilation	29
Heart Failure	37
Chronic Obstructive Pulmonary Disease	11
Diabetes	32
Dementia	13
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA during 2022 were cardiac procedures, ultrasound (sonogram), lab tests and inpatient care.

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

ambulatory monitoring	20
angioplasty	28
blood draw	55
cardiac procedures	355
catheterization	54
diagnostic procedures	12
doctor visit	309
hospital care	120
implant surgery	16
inpatient care	120
lab tests	173
minimally invasive procedures	70
stent placement (stenting)	28
stress testing	36
ultrasound (sonogram)	250
vascular procedures	27

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	303
Female	257

**Ethnicity**
Non-Hispanic White	538
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	212
From 75 to 84	191
85 and over	121
Less than 65	36

Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	44
Depression	21
Chronic Kidney Disease	25
Asthma	6
Osteoperosis	11
Atrial Fibrilation	38
Heart Failure	38
Chronic Obstructive Pulmonary Disease	16
Diabetes	29
Dementia	10
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Thomas Mark Johnson, MD for Medicare patients.

The highest averages for the top procedures that Dr. Thomas Mark Johnson, MD treated as a cardiologist in Dubuque, IA were cardiac procedures, ultrasound (sonogram), lab tests and hospital care.

ambulatory monitoring	19
angioplasty	34
blood draw	74
cardiac procedures	429
cardioversion	17
catheterization	68
diagnostic procedures	24
doctor visit	407
emergency care	15
hospital care	218
implant surgery	15
inpatient care	210
lab tests	237
minimally invasive procedures	75
outpatient care	14
preventive care	16
stent placement (stenting)	33
stress testing	60
thoracic (chest) imaging	47
ultrasound (sonogram)	321
vascular procedures	35
X-rays	47

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Thomas Mark Johnson, MD.

**Gender**
Male	440
Female	380

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	798
Native American / Alaskan Native	0
Hispanic	0
Other	2

**Age**
75 to 84	289
85 and over	163
Less than 65	58
65 to 74	309

Average of Total of Conditions of Medicare patients treated by Dr. Thomas Mark Johnson, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Thomas Mark Johnson, MD treated were hypertension, high cholesterol, ischemic heart disease and heart failure.

Hypertension	66
High Cholesterol	60
Stroke	7
Ischemic Heart Disease	44
Depression	19
Chronic Kidney Disease	27
Asthma	6
Osteoporosis	6
Heart Failure	32
Chronic Obstructive Pulmonary Disease	12
Diabetes	29
Atrial Fibrillation	28
Dementia	11
Cancer	10

Education & Training

He completed residency at Ohio State University Medical Center. He is certified by the Interventional Cardiology, American Board of Internal Medicine (Interventional Cardiology) and has a state license in Wisconsin.

Residency: Ohio State University Medical Center

Board Certification: Interventional Cardiology, American Board of Internal Medicine (Interventional Cardiology)

Licensed In: Wisconsin

Affiliations & Hospitals

Dr. Thomas Mark Johnson, MD is associated with these hospitals and organizations:

MercyOne

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General Payments

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

**Payments by Company**
Cardiovascular Systems Inc.	$1,101 Coronary Orbital Atherectomy System $1,101
Boston Scientific Corporation	$55 Emblem S-ICD $55
E.R. Squibb & Sons, L.L.C.	$44 BYDUREON $44
Astellas Pharma US Inc	$35 $35
Cook Medical LLC	$21 Cook Celect $21
Other	$35 LEQVIO $18	BRILINTA $17

**Types of Payments**
Travel and Lodging	$962
Food and Beverage	$292
Education	$35

Biography

Dr. Thomas Johnson is a medical specialist in adult cardiology. He has a special interest in heart problems. Dr. Johnson attended the University of Iowa, Carver College of Medicine and then went on to complete his residency at Ohio State University Medical Center. He is affiliated with MercyOne. MercyOne reports that Dr. Johnson is accepting new patients at his office in Dubuque, IA.