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Dr. John F. Brennan, MD

(245 Ratings)

Specializes in: Adult Nephrology

Rosalind Franklin University of Medicine and Science, Chicago Medical School

3803 Spring Street
Mount Pleasant, WI 53405

(262) 687-8312

Dr. John F. Brennan, MD is a nephrologist in Mount Pleasant, WI specializing in adult nephrology. He graduated from Rosalind Franklin University of Medicine and Science, Chicago Medical School. Dr. John F. Brennan, MD is affiliated with Ascension, Midwest Orthopedic Specialty Hospital, Ascension SE Wisconsin Hospital - Franklin Campus, Ascension All Saints Hospital and Ascension SE Wisconsin Hospital - Elmbrook Campus.

Office Locations

3803 Spring Street
Mount Pleasant, WI 53405

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Ascension

3803 Spring Street #600
Racine, WI 53405

(262) 687-8312

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Noteworthy Medicare Patient Procedures Performed by Dr. John F. Brennan, MD in 2023

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

Top 10%

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2023, Dr. John F. Brennan, MD had a list price for hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) 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 F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2012 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	225
doctor visit	630
hemofiltration	42
hospital care	558
inpatient care	558

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2013 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	116
doctor visit	612
hemofiltration	22
hospital care	454
inpatient care	454

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	306
Female	255

**Ethnicity**
Non-Hispanic White	370
Black	136
Hispanic	41
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	169
From 75 to 84	146
85 and over	75
Less than 65	171

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

Hypertension	75
High Cholesterol	63
Stroke	7
Ischemic Heart Disease	40
Depression	21
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	5
Atrial Fibrilation	14
Heart Failure	39
Chronic Obstructive Pulmonary Disease	19
Diabetes	53
Dementia	10
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2014 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	129
doctor visit	601
hemofiltration	32
hospital care	423
inpatient care	423

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	270
Female	246

**Ethnicity**
Non-Hispanic White	332
Black	133
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	155
From 75 to 84	150
85 and over	51
Less than 65	160

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

Hypertension	75
High Cholesterol	66
Stroke	8
Ischemic Heart Disease	41
Depression	22
Chronic Kidney Disease	75
Asthma	13
Osteoperosis	7
Atrial Fibrilation	15
Heart Failure	35
Chronic Obstructive Pulmonary Disease	22
Diabetes	52
Dementia	9
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2015 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	134
doctor visit	572
hemofiltration	24
hospital care	467
inpatient care	467

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	564
Female	460

**Ethnicity**
Non-Hispanic White	670
Black	262
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	316
From 75 to 84	266
85 and over	142
Less than 65	300

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

Hypertension	75
High Cholesterol	61
Stroke	8
Ischemic Heart Disease	39
Depression	24
Chronic Kidney Disease	75
Asthma	17
Osteoperosis	6
Atrial Fibrilation	14
Heart Failure	38
Chronic Obstructive Pulmonary Disease	21
Diabetes	52
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2016 were hospital care, inpatient care and dialysis.

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

dialysis	115
doctor visit	525
hospital care	437
inpatient care	437

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	265
Female	229

**Ethnicity**
Non-Hispanic White	314
Black	132
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	152
From 75 to 84	125
85 and over	64
Less than 65	153

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

Hypertension	75
High Cholesterol	64
Stroke	8
Ischemic Heart Disease	40
Depression	25
Chronic Kidney Disease	75
Asthma	25
Osteoperosis	6
Atrial Fibrilation	16
Heart Failure	36
Chronic Obstructive Pulmonary Disease	21
Diabetes	54
Dementia	9
Cancer	10

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2017 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	151
doctor visit	428
hemofiltration	58
hospital care	491
inpatient care	491

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	261
Female	226

**Ethnicity**
Non-Hispanic White	302
Black	134
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	151
From 75 to 84	127
85 and over	64
Less than 65	145

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

Hypertension	75
High Cholesterol	63
Stroke	8
Ischemic Heart Disease	42
Depression	27
Chronic Kidney Disease	75
Asthma	13
Osteoperosis	8
Atrial Fibrilation	18
Heart Failure	40
Chronic Obstructive Pulmonary Disease	21
Diabetes	53
Dementia	10
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2018 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	151
doctor visit	443
hemofiltration	46
hospital care	467
inpatient care	467

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	249
Female	223

**Ethnicity**
Non-Hispanic White	276
Black	138
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	165
From 75 to 84	104
85 and over	57
Less than 65	146

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

Hypertension	75
High Cholesterol	64
Stroke	8
Ischemic Heart Disease	40
Depression	28
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	7
Atrial Fibrilation	17
Heart Failure	42
Chronic Obstructive Pulmonary Disease	22
Diabetes	56
Dementia	11
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2019 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	143
doctor visit	440
hemofiltration	27
hospital care	524
inpatient care	524

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	239
Female	225

**Ethnicity**
Non-Hispanic White	280
Black	121
Hispanic	52
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	141
From 75 to 84	130
85 and over	59
Less than 65	134

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

Hypertension	75
High Cholesterol	70
Stroke	8
Ischemic Heart Disease	45
Depression	30
Chronic Kidney Disease	75
Asthma	15
Osteoperosis	9
Atrial Fibrilation	17
Heart Failure	43
Chronic Obstructive Pulmonary Disease	25
Diabetes	58
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2020 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	188
doctor visit	272
hemofiltration	58
hospital care	399
inpatient care	399

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	221
Female	202

**Ethnicity**
Non-Hispanic White	246
Black	120
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	139
From 75 to 84	109
85 and over	52
Less than 65	123

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

Hypertension	75
High Cholesterol	69
Stroke	6
Ischemic Heart Disease	43
Depression	27
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	8
Atrial Fibrilation	17
Heart Failure	43
Chronic Obstructive Pulmonary Disease	21
Diabetes	58
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2021 were hospital care, inpatient care, dialysis and hemofiltration.

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

dialysis	120
doctor visit	361
hemofiltration	43
hospital care	301
inpatient care	301

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	192
Female	191

**Ethnicity**
Non-Hispanic White	230
Black	105
Hispanic	36
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	127
From 75 to 84	108
85 and over	44
Less than 65	104

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

Hypertension	75
High Cholesterol	69
Stroke	9
Ischemic Heart Disease	46
Depression	25
Chronic Kidney Disease	75
Asthma	15
Osteoperosis	8
Atrial Fibrilation	21
Heart Failure	39
Chronic Obstructive Pulmonary Disease	20
Diabetes	52
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI during 2022 were hospital care, inpatient care and dialysis.

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

dialysis	38
doctor visit	302
hospital care	220
inpatient care	220

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	165
Female	147

**Ethnicity**
Non-Hispanic White	199
Black	74
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	110
From 75 to 84	85
85 and over	44
Less than 65	73

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

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	39
Depression	23
Chronic Kidney Disease	75
Asthma	18
Osteoperosis	12
Atrial Fibrilation	30
Heart Failure	38
Chronic Obstructive Pulmonary Disease	23
Diabetes	51
Dementia	12
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

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

The highest averages for the top procedures that Dr. John F. Brennan, MD treated as a nephrologist in Mount Pleasant, WI were hospital care, inpatient care, dialysis and hemofiltration.

dialysis	137
doctor visit	471
hemofiltration	39
hospital care	431
inpatient care	431

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John F. Brennan, MD.

**Gender**
Male	248
Female	218

**Ethnicity**
Black / African American	123
Asian / Pacific Islander	0
Non-Hispanic White	292
Native American / Alaskan Native	0
Hispanic	11
Other	0

**Age**
75 to 84	122
85 and over	59
Less than 65	137
65 to 74	147

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

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

Hypertension	68
High Cholesterol	60
Stroke	7
Ischemic Heart Disease	37
Depression	22
Chronic Kidney Disease	68
Asthma	13
Osteoporosis	6
Heart Failure	35
Chronic Obstructive Pulmonary Disease	19
Diabetes	49
Atrial Fibrillation	16
Cancer	10
Dementia	10

Education & Training

Dr. John F. Brennan, MD graduated from Rosalind Franklin University of Medicine and Science, Chicago Medical School. He completed residency at Loyola University Affiliated Hospitals. He is certified by the The American Board of Internal Medicine - Internal Medicine The American Board of Internal Medicine - Nephrology and has a state license in Wisconsin.

Medical School: Rosalind Franklin University of Medicine and Science, Chicago Medical School

Residency: Loyola University Affiliated Hospitals

Board Certification: The American Board of Internal Medicine - Internal Medicine The American Board of Internal Medicine - Nephrology

Licensed In: Wisconsin

Affiliations & Hospitals

Dr. John F. Brennan, MD is associated with these hospitals and organizations:

Ascension

Midwest Orthopedic Specialty Hospital

Ascension SE Wisconsin Hospital - Franklin Campus

Ascension All Saints Hospital

Ascension SE Wisconsin Hospital - Elmbrook Campus

Ratings & Reviews

Dr. John F. Brennan, MD has an exceptional overall rating with an average of 4.9 out of 5 stars based on 245 ratings. We collect ratings and reviews of Dr. John F. Brennan, MD from all over the web to help you find the right in Mount Pleasant, WI.

4.9

Overall Rating

(245 Ratings)

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General Payments

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

**Payments by Company**
Relypsa, Inc.	$214 VELTASSA $214
Mallinckrodt LLC	$176 ACTHAR $176
Otsuka America Pharmaceutical, Inc.	$143 JYNARQUE $96	SAMSCA $47
Baxter Healthcare	$111 Renal - Non Product Related $111
OPKO Pharmaceuticals, LLC	$88 Rayaldee $75	Rayaldee (old) $13
Other	$623 Nephrocheck $87	Sensipar $42	KRYSTEXXA $40	GATTEX $32	Rituxan $31	Other $391

**Types of Payments**
Food and Beverage	$1,161
Education	$193

Biography

Dr. John Brennan sees patients in Racine, WI and Mount Pleasant, WI. His medical specialty is adult nephrology. He is rated 5.0 stars (out of 5) by his patients. Dr. Brennan's hospital/clinic affiliations include Ascension and Midwest Orthopedic Specialty Hospital. He attended Rosalind Franklin University of Medicine and Science, Chicago Medical School and subsequently trained at a hospital affiliated with Loyola University for residency.