In 2023, among providers in related specialties within Illinois, Dr. Mark Christopher Gillis, MD performed more A1C test, blood draw, lab tests, lipid profile, phlebotomy for lab tests, and preventive care procedures for Medicare patients than 95% of them and he also had a list price for antinuclear antibody (ANA) test, folic acid tests, and serum folate test that was lower than the list prices billed to Medicare by 95% 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.

Top 10%

By Affordability:

parathyroid hormone test

prostate screening

In 2023, Dr. Mark Christopher Gillis, MD had a list price for parathyroid hormone (PTH) test, prostate screening, screening PSA test, sed rate (ESR), total PSA test, and vitamin B12 test that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Illinois. 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:

antibody tests

complete blood count

creatinine urine test

microalbumin urine test

prostate-specific antigen test

screening PSA test

thyroid blood test

By Affordability:

albumin test

cholesterol screening

complete blood count

creatinine test

creatinine urine test

iron tests

kidney function tests

lipid profile

metabolic panel

microalbumin test

microalbumin urine test

prostate-specific antigen test

prothrombin time test

rheumatoid factor test

thyroid blood test

thyroid function tests

In 2012, among providers in related specialties within Illinois, Dr. Mark Christopher Gillis, MD performed more antibody tests, complete blood count (CBC), creatinine urine test, microalbumin urine test, prostate-specific antigen (PSA) test, screening PSA test, and thyroid blood test procedures for Medicare patients than 75% of them and he also had a list price for albumin test, cholesterol screening, complete blood count (CBC), creatinine test, creatinine urine test, iron tests, kidney function tests, lipid profile, metabolic panel, microalbumin test, microalbumin urine test, prostate-specific antigen (PSA) test, prothrombin time (PT) test, rheumatoid factor (RF) test, thyroid blood test, thyroid function tests, uric acid blood test, uric acid test, urinalysis, and vitamin D test 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. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2012 were blood draw, lab tests, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	373
diabetes management	102
doctor visit	695
ear procedures	15
hospital care	242
inpatient care	242
lab tests	264
preventive care	221
vaccines	119

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2013 were lab tests, hospital care, inpatient care and preventive care.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	135
diabetes management	85
doctor visit	658
hospital care	218
inpatient care	218
lab tests	250
preventive care	210
vaccines	125

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	155
Female	198

**Ethnicity**
Non-Hispanic White	339
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	185
From 75 to 84	116
85 and over	30
Less than 65	22

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2013

Hypertension	63
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	30
Depression	13
Chronic Kidney Disease	17
Asthma	5
Osteoperosis	7
Atrial Fibrilation	13
Heart Failure	13
Chronic Obstructive Pulmonary Disease	9
Diabetes	24
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2014 were preventive care, lab tests, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

diabetes management	108
doctor visit	726
hospital care	211
inpatient care	211
lab tests	211
preventive care	231
vaccines	123

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	156
Female	191

**Age**
From 65 to 74	182
From 75 to 84	115
85 and over	28
Less than 65	22

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2014

Hypertension	60
High Cholesterol	55
Stroke	6
Ischemic Heart Disease	32
Depression	13
Chronic Kidney Disease	19
Asthma	5
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	25
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2015 were preventive care, vaccines, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

diabetes management	88
doctor visit	754
hospital care	202
inpatient care	202
lab tests	127
preventive care	319
vaccines	231

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	314
Female	388

**Ethnicity**
Non-Hispanic White	672
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	396
From 75 to 84	200
85 and over	58
Less than 65	48

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2015

Hypertension	54
High Cholesterol	50
Stroke	4
Ischemic Heart Disease	30
Depression	11
Chronic Kidney Disease	18
Asthma	5
Osteoperosis	7
Atrial Fibrilation	13
Heart Failure	11
Chronic Obstructive Pulmonary Disease	11
Diabetes	22
Dementia	7
Cancer	10

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2016 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

diabetes management	41
doctor visit	750
hospital care	253
inpatient care	242
lab tests	79
outpatient care	11
preventive care	188
vaccines	147

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	182
Female	203

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

**Age**
From 65 to 74	229
From 75 to 84	102
85 and over	30
Less than 65	24

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2016

Hypertension	61
High Cholesterol	55
Stroke	5
Ischemic Heart Disease	28
Depression	12
Chronic Kidney Disease	21
Asthma	12
Osteoperosis	6
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	9
Diabetes	22
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2017 were hospital care, inpatient care, lab tests and preventive care.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	40
doctor visit	878
hospital care	216
inpatient care	216
lab tests	85
preventive care	75
vaccines	49

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	199
Female	202

**Ethnicity**
Non-Hispanic White	387
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	228
From 75 to 84	113
85 and over	37
Less than 65	23

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2017

Hypertension	61
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	27
Depression	14
Chronic Kidney Disease	25
Asthma	3
Osteoperosis	8
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	10
Diabetes	24
Dementia	9
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2018 were lab tests, preventive care, blood draw and diabetes management.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	342
diabetes management	151
doctor visit	658
lab tests	964
preventive care	516
thyroid function tests	92
vaccines	131

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	226
Female	184

**Ethnicity**
Non-Hispanic White	380
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	234
From 75 to 84	113
85 and over	45
Less than 65	18

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2018

Hypertension	60
High Cholesterol	54
Stroke	4
Ischemic Heart Disease	30
Depression	13
Chronic Kidney Disease	26
Asthma	6
Osteoperosis	4
Atrial Fibrilation	13
Heart Failure	12
Chronic Obstructive Pulmonary Disease	10
Diabetes	22
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2019 were lab tests, preventive care, blood draw and vaccines.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	405
diabetes management	155
doctor visit	693
lab tests	1179
preventive care	577
thyroid function tests	95
vaccines	199

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	234
Female	210

**Ethnicity**
Non-Hispanic White	412
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	124
85 and over	43
Less than 65	21

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2019

Hypertension	62
High Cholesterol	54
Stroke	3
Ischemic Heart Disease	32
Depression	14
Chronic Kidney Disease	26
Asthma	6
Osteoperosis	8
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	9
Diabetes	24
Dementia	7
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2020 were lab tests, preventive care, blood draw and vaccines.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	440
diabetes management	187
doctor visit	621
lab tests	1452
preventive care	656
thyroid function tests	129
vaccines	191

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	225
Female	205

**Ethnicity**
Non-Hispanic White	406
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	243
From 75 to 84	124
85 and over	42
Less than 65	21

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2020

Hypertension	60
High Cholesterol	56
Stroke	3
Ischemic Heart Disease	32
Depression	12
Chronic Kidney Disease	26
Asthma	3
Osteoperosis	5
Atrial Fibrilation	10
Heart Failure	13
Chronic Obstructive Pulmonary Disease	9
Diabetes	24
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2021 were lab tests, preventive care, blood draw and diabetes management.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	569
diabetes management	250
doctor visit	732
lab tests	1989
preventive care	818
thyroid function tests	153
vaccines	171

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	255
Female	228

**Ethnicity**
Non-Hispanic White	459
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	272
From 75 to 84	149
85 and over	43
Less than 65	19

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2021

Hypertension	59
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	32
Depression	10
Chronic Kidney Disease	27
Asthma	4
Osteoperosis	7
Atrial Fibrilation	11
Heart Failure	11
Chronic Obstructive Pulmonary Disease	8
Diabetes	22
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL during 2022 were lab tests, preventive care, blood draw and diabetes management.

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

blood draw	609
diabetes management	288
doctor visit	657
lab tests	2175
preventive care	767
thyroid function tests	132
vaccines	14

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Male	268
Female	225

**Ethnicity**
Non-Hispanic White	464
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	275
From 75 to 84	150
85 and over	48
Less than 65	20

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2022

Hypertension	71
High Cholesterol	75
Stroke	4
Ischemic Heart Disease	27
Depression	9
Chronic Kidney Disease	21
Asthma	6
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	10
Chronic Obstructive Pulmonary Disease	11
Diabetes	23
Dementia	5
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark Christopher Gillis, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark Christopher Gillis, MD treated as a family medicine practitioner in Itasca, IL were lab tests, preventive care, blood draw and hospital care.

blood draw	364
diabetes management	145
doctor visit	711
ear procedures	15
hospital care	223
inpatient care	221
lab tests	797
outpatient care	11
preventive care	416
thyroid function tests	120
vaccines	136

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark Christopher Gillis, MD.

**Gender**
Female	203
Male	201

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	353
Native American / Alaskan Native	0
Hispanic	0
Other	2

**Age**
85 and over	36
75 to 84	118
Less than 65	21
65 to 74	227

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

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

Hypertension	55
High Cholesterol	51
Stroke	3
Ischemic Heart Disease	27
Depression	11
Chronic Kidney Disease	20
Asthma	5
Osteoporosis	6
Heart Failure	11
Chronic Obstructive Pulmonary Disease	9
Diabetes	21
Atrial Fibrillation	11
Dementia	6
Cancer	11

Education & Training

He has a state license in Illinois.

Licensed In: Illinois

Ratings & Reviews

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General Payments

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

**Payments by Company**
Cook Incorporated	$125 Endoscopy $125
GlaxoSmithKline, LLC.	$54 SHINGRIX $31	BEXSERO $22
Janssen Pharmaceuticals, Inc	$31 XARELTO $31
Medtronic Sofamor Danek USA, Inc.	$14 $14

**Types of Payments**
Food and Beverage	$224

Biography

Dr. Mark Gillis' medical specialty is family medicine. He studied medicine at Loyola University Chicago, Stritch School of Medicine.

Select Year:

Dr. Mark Christopher Gillis, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Christopher Gillis, MD in 2023

By Volume:

By Affordability:

By Affordability:

By Volume:

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. Mark Christopher Gillis, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Christopher Gillis, MD in 2022

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

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

Education & Training

Ratings & Reviews

General Payments

Biography

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