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Dr. Robert John Fontana, MD

(Dr. Robert J. Fontana, MD)

(153 Ratings)

Specializes in: Adult Gastroenterology and Adult Transplant Hepatology

University of Michigan Medical School (1988)

Professional interests include: acute liver failure , autoimmune hepatitis, cirrhosis, and more.

1500 E Medical Center Drive Floor 1 Reception G
Ann Arbor, MI 48109

1-800-333-9013

Dr. Robert John Fontana, MD is a gastroenterologist in Ann Arbor, MI specializing in adult gastroenterology and adult transplant hepatology. He graduated from University of Michigan Medical School in 1988 and has 38 years of experience. Dr. Robert John Fontana, MD is affiliated with The Regents of the University of Michigan and University of Michigan Health.

Office Locations

University of Michigan Health

1500 E Medical Center Drive Floor 1 Reception G
Ann Arbor, MI 48109

1-800-333-9013

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University of Michigan Health

39901 Traditions Drive Floor 1
Northville, MI 48168

(734) 936-9250

(248) 305-4401

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4270 Plymouth Road Entrance 4
Ann Arbor, MI 48109

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7500 Challis Road Entrance 2, Level 1
Brighton, MI 48116

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In The News (see more mentions in the news)

“In this exclusive MedPage Today video, Robert Fontana, MD, of the University of Michigan in Ann Arbor, summarizes which patients are appropriate for treatment, which biomarkers and imaging tools...”—"New Guidance on Resmetirom and Semaglutide for MASH", MedPage Today, November 2025

“A goal of the JAMA Network Open research was to capture this magnitude - at least where herbal supplements are concerned - said co-author Dr. Robert Fontana, a professor of internal medicine at the...”—"Drug-induced liver injuries rise in the U.S. as supplements grow in popularity: What to know", NBC News, May 2025

“"In a previous study, we found that there was a great deal of mislabeling of some of these products," said Dr. Robert Fontana, a Michigan Medicine a hepatologist, professor of medicine and the...”—"Popular health supplements causing liver damage, hospitalizations, research finds", Staten Island NY Local News, August 2024

Noteworthy Medicare Patient Procedures Performed by Dr. Robert John Fontana, MD in 2023

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

Top 10%

By Volume:

inpatient hospital care

In 2023, Dr. Robert John Fontana, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 90% of providers in related specialties within Michigan.

Top 25%

By Volume:

FibroScan

In 2012, Dr. Robert John Fontana, MD performed more FibroScan (transient elastography) procedures for Medicare patients than 75% of providers in related specialties within Michigan.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2012 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

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

diagnostic procedures	14
doctor visit	248
gastrointestinal procedures	32
hospital care	296
inpatient care	296
minimally invasive procedures	32
removal of lesion (e.g. growth)	14

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2013 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

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

diagnostic procedures	11
doctor visit	309
gastrointestinal procedures	34
hospital care	159
inpatient care	159
minimally invasive procedures	34
removal of lesion (e.g. growth)	11

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	182
Female	133

**Ethnicity**
Non-Hispanic White	263
Black	21
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	137
From 75 to 84	0
85 and over	0
Less than 65	135

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

Hypertension	65
High Cholesterol	37
Stroke	0
Ischemic Heart Disease	33
Depression	27
Chronic Kidney Disease	43
Asthma	7
Osteoperosis	11
Atrial Fibrilation	8
Heart Failure	21
Chronic Obstructive Pulmonary Disease	15
Diabetes	44
Dementia	5
Cancer	6

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2014 were hospital care and inpatient care.

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

doctor visit	260
hospital care	152
inpatient care	152

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	165
Female	125

**Ethnicity**
Non-Hispanic White	235
Black	27
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	126
From 75 to 84	0
85 and over	0
Less than 65	120

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

Hypertension	63
High Cholesterol	37
Stroke	4
Ischemic Heart Disease	32
Depression	32
Chronic Kidney Disease	46
Asthma	10
Osteoperosis	11
Atrial Fibrilation	7
Heart Failure	20
Chronic Obstructive Pulmonary Disease	16
Diabetes	44
Dementia	4
Cancer	6

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2015 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

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

diagnostic procedures	30
doctor visit	282
gastrointestinal procedures	32
hospital care	415
inpatient care	415
liver imaging	31
minimally invasive procedures	43
minor procedures	11
removal of lesion (e.g. growth)	19
ultrasound (sonogram)	31

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	452
Female	320

**Ethnicity**
Non-Hispanic White	590
Black	100
Hispanic	26
Asian	0
Other	30
Native American	0

**Age**
From 65 to 74	320
From 75 to 84	0
85 and over	0
Less than 65	360

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

Hypertension	68
High Cholesterol	37
Stroke	5
Ischemic Heart Disease	34
Depression	34
Chronic Kidney Disease	50
Asthma	12
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	25
Chronic Obstructive Pulmonary Disease	14
Diabetes	44
Dementia	6
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2016 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

diagnostic procedures	11
doctor visit	218
gastrointestinal procedures	22
hospital care	184
inpatient care	184
liver imaging	92
minimally invasive procedures	22
removal of lesion (e.g. growth)	11
ultrasound (sonogram)	92

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	183
Female	172

**Ethnicity**
Non-Hispanic White	274
Black	42
Hispanic	0
Asian	0
Other	18
Native American	0

**Age**
From 65 to 74	158
From 75 to 84	0
85 and over	0
Less than 65	150

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

Hypertension	71
High Cholesterol	40
Stroke	0
Ischemic Heart Disease	34
Depression	34
Chronic Kidney Disease	52
Asthma	19
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	25
Chronic Obstructive Pulmonary Disease	18
Diabetes	44
Dementia	8
Cancer	6

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2017 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

doctor visit	217
gastrointestinal procedures	18
hospital care	233
inpatient care	233
liver imaging	71
minimally invasive procedures	18
ultrasound (sonogram)	71

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	157
Female	175

**Ethnicity**
Non-Hispanic White	258
Black	40
Hispanic	0
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	156
From 75 to 84	0
85 and over	0
Less than 65	121

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

Hypertension	73
High Cholesterol	45
Stroke	7
Ischemic Heart Disease	37
Depression	31
Chronic Kidney Disease	55
Asthma	11
Osteoperosis	13
Atrial Fibrilation	11
Heart Failure	23
Chronic Obstructive Pulmonary Disease	21
Diabetes	45
Dementia	14
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2018 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

diagnostic procedures	25
doctor visit	235
gastrointestinal procedures	25
hospital care	278
inpatient care	278
liver imaging	44
minimally invasive procedures	25
removal of lesion (e.g. growth)	25
ultrasound (sonogram)	44

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	177
Female	158

**Ethnicity**
Non-Hispanic White	276
Black	29
Hispanic	0
Asian	0
Other	14
Native American	0

**Age**
From 65 to 74	154
From 75 to 84	51
85 and over	11
Less than 65	119

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

Hypertension	73
High Cholesterol	48
Stroke	5
Ischemic Heart Disease	39
Depression	40
Chronic Kidney Disease	63
Asthma	13
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	27
Chronic Obstructive Pulmonary Disease	23
Diabetes	47
Dementia	16
Cancer	9

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2019 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

doctor visit	202
gastrointestinal procedures	15
hospital care	149
inpatient care	149
liver imaging	53
minimally invasive procedures	15
ultrasound (sonogram)	53

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	157
Female	134

**Ethnicity**
Non-Hispanic White	246
Black	18
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	146
From 75 to 84	0
85 and over	0
Less than 65	94

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

Hypertension	69
High Cholesterol	42
Stroke	4
Ischemic Heart Disease	34
Depression	36
Chronic Kidney Disease	58
Asthma	11
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	29
Chronic Obstructive Pulmonary Disease	18
Diabetes	43
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2020 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

doctor visit	164
hospital care	216
inpatient care	216
liver imaging	20
ultrasound (sonogram)	20

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	130
Female	117

**Ethnicity**
Non-Hispanic White	204
Black	13
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	127
From 75 to 84	42
85 and over	11
Less than 65	67

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

Hypertension	69
High Cholesterol	41
Stroke	0
Ischemic Heart Disease	34
Depression	38
Chronic Kidney Disease	55
Asthma	6
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	28
Chronic Obstructive Pulmonary Disease	13
Diabetes	36
Dementia	11
Cancer	12

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2021 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

doctor visit	122
hospital care	120
inpatient care	120
liver imaging	49
ultrasound (sonogram)	49

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	108
Female	124

**Ethnicity**
Non-Hispanic White	192
Black	16
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	128
From 75 to 84	0
85 and over	0
Less than 65	55

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

Hypertension	68
High Cholesterol	47
Stroke	5
Ischemic Heart Disease	33
Depression	34
Chronic Kidney Disease	52
Asthma	10
Osteoperosis	13
Atrial Fibrilation	8
Heart Failure	22
Chronic Obstructive Pulmonary Disease	13
Diabetes	38
Dementia	8
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI during 2022 were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

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

doctor visit	117
gastrointestinal procedures	12
hospital care	155
inpatient care	155
liver imaging	40
minimally invasive procedures	12
ultrasound (sonogram)	40

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	120
Female	118

**Ethnicity**
Non-Hispanic White	198
Black	18
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	115
From 75 to 84	0
85 and over	0
Less than 65	63

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

Hypertension	75
High Cholesterol	63
Stroke	6
Ischemic Heart Disease	26
Depression	33
Chronic Kidney Disease	39
Asthma	11
Osteoperosis	16
Atrial Fibrilation	19
Heart Failure	27
Chronic Obstructive Pulmonary Disease	18
Diabetes	37
Dementia	9
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

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

The highest averages for the top procedures that Dr. Robert John Fontana, MD treated as a gastroenterologist in Ann Arbor, MI were hospital care, inpatient care, ultrasound (sonogram) and liver imaging.

diagnostic procedures	18
doctor visit	215
gastrointestinal procedures	23
hospital care	214
inpatient care	214
liver imaging	50
minimally invasive procedures	25
minor procedures	11
removal of lesion (e.g. growth)	16
ultrasound (sonogram)	50

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Robert John Fontana, MD.

**Gender**
Male	166
Female	143

**Ethnicity**
Black / African American	29
Asian / Pacific Islander	0
Non-Hispanic White	248
Native American / Alaskan Native	0
Hispanic	3
Other	8

**Age**
75 to 84	8
85 and over	2
Less than 65	116
65 to 74	142

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

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

Hypertension	63
High Cholesterol	39
Stroke	3
Ischemic Heart Disease	30
Depression	30
Chronic Kidney Disease	46
Asthma	10
Osteoporosis	11
Heart Failure	22
Chronic Obstructive Pulmonary Disease	15
Diabetes	38
Atrial Fibrillation	10
Dementia	8
Cancer	8

Education & Training

Dr. Robert John Fontana, MD graduated from University of Michigan Medical School in 1988. He completed residency at Northwestern University Affiliated Hospitals. He is certified by the Board Certification: Transplant Hepatology and has a state license in Michigan.

Medical School: University of Michigan Medical School (1988)

Residency: Northwestern University Affiliated Hospitals (1991)

Board Certification: Board Certification: Transplant Hepatology

Licensed In: Michigan

Affiliations & Hospitals

Dr. Robert John Fontana, MD is associated with these hospitals and organizations:

The Regents of the University of Michigan

University of Michigan Health

Ratings & Reviews

Dr. Robert John Fontana, MD has an exceptional overall rating with an average of 4.7 out of 5 stars based on 153 ratings. We collect ratings and reviews of Dr. Robert John Fontana, MD from all over the web to help you find the right in Ann Arbor, MI.

4.7

Overall Rating

(153 Ratings)

Leave a Review

General Payments

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

**Payments by Company**
AstraZeneca UK Limited	$3,232 $3,232
E.R. Squibb & Sons, L.L.C.	$2,400 DAKLINZA $2,331	$69
SANOFI US SERVICES INC.	$750 $750
AbbVie, Inc.	$539 Viekira $539
Wako Life Sciences, Inc.	$76 Wako HCC Biomarker(s) DCP and AFP-L3 $76

**Types of Payments**
Consulting Fee	$3,982
Travel and Lodging	$2,724
Food and Beverage	$291

Research Payments

Dr. Robert John Fontana, MD has received 112 research payments totaling $867,910.

Biography

Dr. Robert Fontana sees patients in Ann Arbor, MI, Brighton, MI, and Northville, MI. His medical specialties are adult gastroenterology and adult transplant hepatology. Patients rated him highly, giving him an average of 4.5 stars (out of 5). Areas of particular interest for Dr. Fontana include portal hypertension, acute liver failure, and viral hepatitis. He studied medicine at the University of Michigan Medical School. His training includes residency programs at St. Joseph's Hospital and a hospital affiliated with Northwestern University. He is affiliated with the University of Michigan Health.