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Dr. Aaron J. Shiels, MD

(601 Ratings)

Specializes in: Adult Gastroenterology

Professional interests include: gastrointestinal problems (digestive disorders)

401 Roxbury Road
Rockford, IL 61107

(815) 397-7340

Dr. Aaron J. Shiels, MD is a gastroenterologist in Rockford, IL specializing in adult gastroenterology. Dr. Aaron J. Shiels, MD is affiliated with OSF Healthcare and Rockford Gastroenterology Associates.

Office Locations

Rockford Gastroenterology Associates

401 Roxbury Road
Rockford, IL 61107

(815) 397-7340

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Some issues Dr. Aaron J. Shiels, MD can help you with:

Gastrointestinal Problems (Digestive Disorders)

The gastrointestinal system, or GI tract, is the name given to a collection of organs that work together to digest food. These organs fit together in a long tube, running from the mouth to the anus, and include the esophagus, stomach, and intestines, among others. With so many parts working together, complicated by today's busy lifestyles and diets, digestive problems are common. As many as 1 in 3 Americans have a digestive or GI disorder. There are a huge variety of digestive problems, but the most common are IBS, constipation, GERD, hemorrhoids, and ulcers.

IBS, or irritable bowel syndrome, happens when the muscles surrounding the colon contract too easily or frequently. The result is abdominal pain, cramps, diarrhea or constipation, gas and bloating. IBS attacks can often be brought on by specific triggers, so a key part of treatment is learning which foods trigger IBS attacks and avoiding them. Treatment also includes exercise, avoiding stress, and medications if needed.

Constipation, or large, hard, or infrequent stools, happens to everyone at some point. It can be caused by a disruption in routine or food, or by eating a diet without many fresh fruits and vegetables. Although it is uncomfortable, constipation is common and usually not serious, but it can sometimes become chronic. Adding fiber to the diet, exercising, and taking medications may help.

GERD, or gastroesophageal reflux disease, is a severe form of chronic heartburn where stomach acid spills back up into the esophagus. Left untreated, the acid may even eat away at the esophagus and cause serious damage. Treatment includes changing the diet to avoid trigger foods, losing weight if needed, medications, or even surgery.

Hemorrhoids are blood vessels around the rectum that become irritated, swollen or torn while straining during a bowel movement. They are most often caused by constipation, but can also be caused by pregnancy, diarrhea, or simply a genetic predisposition towards hemorrhoids. Treatment involves first treating any constipation issues, then keeping the area clean and soothed until it has healed. If these measures are ineffective, surgery is sometimes used.

Peptic ulcers are sores or spots of inflammation in the lining of the stomach or close to the stomach in the small intestine. Usually this area is coated with a protective lining that shields the tissue from the strong stomach acid, but a break in the lining can let acid in, causing the sores. It used to be thought that stress caused ulcers, but now it is known that is not the case. Most often, they are caused by an infection by H. pylori bacteria, but ulcers can also be caused by alcohol abuse or overuse of aspirin, ibuprofen, naproxen, or other NSAIDS. The symptoms of an ulcer are pain, hunger, nausea, and fatigue.

Gastrointestinal problems, perhaps more than any other area, are markedly affected by lifestyle. Many disorders can be prevented or treated at least in part by eating a healthy diet high in fiber, exercising regularly, drinking enough water, and limiting alcohol intake. Still, the frequency of digestive disorders means that even the healthiest person can be affected by them. Anyone who notices blood in their stool, experiences abdominal pain, unexplained weight loss, or any significant change in bowel movements should see a doctor.

Noteworthy Medicare Patient Procedures Performed by Dr. Aaron J. Shiels, MD in 2023

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

Top 25%

By Volume:

screening colonoscopy

By Affordability:

diagnostic EGD

diagnostic upper endoscopy

EGD with biopsy

EGD with lesion removal

esophagogastroduodenoscopy

therapeutic EGD

therapeutic upper endoscopy

upper endoscopy

upper endoscopy with biopsy

upper endoscopy with lesion removal

In 2012, among providers in related specialties within Illinois, Dr. Aaron J. Shiels, MD performed more screening colonoscopy procedures for Medicare patients than 75% of them and he also had a list price for diagnostic EGD, diagnostic upper endoscopy, EGD with biopsy, EGD with lesion removal, esophagogastroduodenoscopy (EGD), therapeutic EGD, therapeutic upper endoscopy, upper endoscopy, upper endoscopy with biopsy, and upper endoscopy with lesion removal that was lower than the list prices billed to Medicare by 75% of them. 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. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2012 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	190
doctor visit	306
esophageal dilation	19
gastrointestinal procedures	369
hospital care	263
inpatient care	263
minimally invasive procedures	369
preventive care	107
removal of lesion (e.g. growth)	190

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2013 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	253
doctor visit	340
esophageal dilation	25
gastrointestinal procedures	477
hospital care	295
inpatient care	295
minimally invasive procedures	477
preventive care	108
removal of lesion (e.g. growth)	253
stent placement (stenting)	12

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	336
Female	412

**Ethnicity**
Non-Hispanic White	646
Black	58
Hispanic	31
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	317
From 75 to 84	208
85 and over	77
Less than 65	146

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2013

Hypertension	71
High Cholesterol	58
Stroke	9
Ischemic Heart Disease	39
Depression	28
Chronic Kidney Disease	32
Asthma	9
Osteoperosis	10
Atrial Fibrilation	15
Heart Failure	27
Chronic Obstructive Pulmonary Disease	22
Diabetes	38
Dementia	10
Cancer	14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2014 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	187
doctor visit	240
esophageal dilation	31
gastrointestinal procedures	367
hospital care	256
inpatient care	256
minimally invasive procedures	367
preventive care	80
removal of lesion (e.g. growth)	187

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	301
Female	340

**Ethnicity**
Non-Hispanic White	545
Black	53
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	251
From 75 to 84	184
85 and over	68
Less than 65	138

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2014

Hypertension	66
High Cholesterol	51
Stroke	7
Ischemic Heart Disease	37
Depression	27
Chronic Kidney Disease	32
Asthma	9
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	27
Chronic Obstructive Pulmonary Disease	22
Diabetes	38
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2015 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	214
doctor visit	214
esophageal dilation	24
gastrointestinal procedures	406
hospital care	274
inpatient care	274
minimally invasive procedures	406
preventive care	115
removal of lesion (e.g. growth)	214

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	588
Female	748

**Ethnicity**
Non-Hispanic White	1142
Black	106
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	618
From 75 to 84	316
85 and over	144
Less than 65	258

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2015

Hypertension	70
High Cholesterol	53
Stroke	6
Ischemic Heart Disease	33
Depression	27
Chronic Kidney Disease	36
Asthma	17
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	25
Chronic Obstructive Pulmonary Disease	20
Diabetes	34
Dementia	9
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2016 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	218
doctor visit	222
esophageal dilation	22
gastrointestinal procedures	421
hospital care	299
inpatient care	299
minimally invasive procedures	421
preventive care	111
removal of lesion (e.g. growth)	218

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	281
Female	381

**Ethnicity**
Non-Hispanic White	579
Black	44
Hispanic	24
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	320
From 75 to 84	154
85 and over	51
Less than 65	137

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2016

Hypertension	71
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	36
Depression	30
Chronic Kidney Disease	42
Asthma	26
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	26
Chronic Obstructive Pulmonary Disease	23
Diabetes	35
Dementia	11
Cancer	14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2017 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	230
doctor visit	163
esophageal dilation	23
gastrointestinal procedures	426
hospital care	311
inpatient care	311
minimally invasive procedures	426
preventive care	124
removal of lesion (e.g. growth)	230

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	296
Female	386

**Ethnicity**
Non-Hispanic White	597
Black	45
Hispanic	27
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	333
From 75 to 84	163
85 and over	56
Less than 65	130

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2017

Hypertension	70
High Cholesterol	52
Stroke	5
Ischemic Heart Disease	39
Depression	29
Chronic Kidney Disease	42
Asthma	10
Osteoperosis	10
Atrial Fibrilation	14
Heart Failure	29
Chronic Obstructive Pulmonary Disease	21
Diabetes	35
Dementia	12
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2018 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	229
doctor visit	134
esophageal dilation	21
gastrointestinal procedures	412
hospital care	241
inpatient care	241
minimally invasive procedures	412
preventive care	104
removal of lesion (e.g. growth)	229

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	277
Female	338

**Ethnicity**
Non-Hispanic White	545
Black	32
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	297
From 75 to 84	162
85 and over	46
Less than 65	110

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2018

Hypertension	68
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	33
Depression	26
Chronic Kidney Disease	43
Asthma	7
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	25
Chronic Obstructive Pulmonary Disease	21
Diabetes	34
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2019 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	238
doctor visit	153
esophageal dilation	20
gastrointestinal procedures	399
hospital care	264
inpatient care	264
minimally invasive procedures	399
preventive care	85
removal of lesion (e.g. growth)	238

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	292
Female	330

**Ethnicity**
Non-Hispanic White	549
Black	34
Hispanic	28
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	299
From 75 to 84	171
85 and over	61
Less than 65	91

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2019

Hypertension	69
High Cholesterol	62
Stroke	5
Ischemic Heart Disease	37
Depression	28
Chronic Kidney Disease	41
Asthma	8
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	27
Chronic Obstructive Pulmonary Disease	23
Diabetes	36
Dementia	9
Cancer	16

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2020 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	177
doctor visit	279
esophageal dilation	12
gastrointestinal procedures	272
hospital care	202
inpatient care	202
minimally invasive procedures	272
preventive care	54
removal of lesion (e.g. growth)	177

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	238
Female	295

**Ethnicity**
Non-Hispanic White	462
Black	24
Hispanic	29
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	258
From 75 to 84	137
85 and over	40
Less than 65	98

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2020

Hypertension	68
High Cholesterol	60
Stroke	7
Ischemic Heart Disease	35
Depression	27
Chronic Kidney Disease	46
Asthma	9
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	32
Chronic Obstructive Pulmonary Disease	20
Diabetes	35
Dementia	11
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2021 were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	178
doctor visit	288
esophageal dilation	15
gastrointestinal procedures	282
hospital care	203
inpatient care	203
minimally invasive procedures	282
preventive care	56
removal of lesion (e.g. growth)	178

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	255
Female	277

**Ethnicity**
Non-Hispanic White	466
Black	25
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	149
85 and over	47
Less than 65	80

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2021

Hypertension	68
High Cholesterol	66
Stroke	6
Ischemic Heart Disease	37
Depression	30
Chronic Kidney Disease	44
Asthma	7
Osteoperosis	10
Atrial Fibrilation	15
Heart Failure	27
Chronic Obstructive Pulmonary Disease	17
Diabetes	35
Dementia	10
Cancer	14

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

diagnostic procedures	200
doctor visit	149
gastrointestinal procedures	288
hospital care	153
inpatient care	153
minimally invasive procedures	288
preventive care	57
removal of lesion (e.g. growth)	200

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	222
Female	277

**Ethnicity**
Non-Hispanic White	440
Black	25
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	253
From 75 to 84	145
85 and over	49
Less than 65	52

Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD in 2022

Hypertension	73
High Cholesterol	71
Stroke	6
Ischemic Heart Disease	27
Depression	22
Chronic Kidney Disease	30
Asthma	11
Osteoperosis	13
Atrial Fibrilation	20
Heart Failure	24
Chronic Obstructive Pulmonary Disease	17
Diabetes	33
Dementia	7
Cancer	16

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Aaron J. Shiels, MD for Medicare patients.

The highest averages for the top procedures that Dr. Aaron J. Shiels, MD treated as a gastroenterologist in Rockford, IL were minimally invasive procedures, gastrointestinal procedures, hospital care and inpatient care.

diagnostic procedures	210
doctor visit	226
esophageal dilation	21
gastrointestinal procedures	374
hospital care	251
inpatient care	251
minimally invasive procedures	374
preventive care	91
removal of lesion (e.g. growth)	210
stent placement (stenting)	12

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Aaron J. Shiels, MD.

**Gender**
Male	280
Female	344

**Ethnicity**
Black / African American	40
Asian / Pacific Islander	0
Non-Hispanic White	542
Native American / Alaskan Native	0
Hispanic	18
Other	0

**Age**
75 to 84	162
85 and over	58
Less than 65	112
65 to 74	291

Average of Total of Conditions of Medicare patients treated by Dr. Aaron J. Shiels, MD From 2012 - 2022

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

Hypertension	63
High Cholesterol	53
Stroke	5
Ischemic Heart Disease	32
Depression	24
Chronic Kidney Disease	35
Asthma	10
Osteoporosis	8
Heart Failure	24
Chronic Obstructive Pulmonary Disease	18
Diabetes	32
Atrial Fibrillation	12
Dementia	9
Cancer	12

Education & Training

He completed residency at Barnes-Jewish Hospital. He is certified by the American Board of Internal Medicine - Gastroenterology and has a state license in Illinois.

Residency: Barnes-Jewish Hospital (2001)

Board Certification: American Board of Internal Medicine - Gastroenterology (2005)

Licensed In: Illinois

Affiliations & Hospitals

Dr. Aaron J. Shiels, MD is associated with these hospitals and organizations:

OSF Healthcare

Rockford Gastroenterology Associates

Ratings & Reviews

Dr. Aaron J. Shiels, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 601 ratings. We collect ratings and reviews of Dr. Aaron J. Shiels, MD from all over the web to help you find the right in Rockford, IL.

Overall Rating

(601 Ratings)

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General Payments

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

**Payments by Company**
Janssen Products, LP	$312 OLYSIO $312
AbbVie, Inc.	$264 Lupron $81	Mavyret $38	Technivie $24	$121
Boston Scientific Corporation	$133 GENERAL - THERAPIES $92	Biliary Devices $16	EXALT MODEL D CONTROLLER $14	METAL STENTS - G.I. $11
Gilead Sciences Inc	$101 $101
Gilead Sciences, Inc.	$82 $82
Other	$360 ESD - Core Endoscopy $79	VIBERZI $79	CYLTEZO $29	FUJIFILM $28	GI Solutions $27	Other $118

**Types of Payments**
Food and Beverage	$957
Education	$187
Gift	$79
Long term medical supply or device loan	$28

Biography

Dr. Aaron Shiels practices adult gastroenterology in Rockford, IL. Dr. Shiels is a graduate of Washington University in St. Louis School of Medicine and a graduate of Barnes-Jewish Hospital's residency program. Clinical interests for Dr. Shiels include gastrointestinal problems (digestive disorders). His patients gave him an average rating of 5.0 stars (out of 5). Dr. Shiels is affiliated with OSF Healthcare.