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Dr. Ioannis Karkatzounis, MD

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Specializes in: Internal Medicine (Adult Medicine), Hospital Medicine (Hospitalist) and Sleep Medicine

Demokritos University of Thrace (1999)

Professional interests include: sleep disorders

855 N Westhaven Drive
Oshkosh, WI 54904

(920) 303-8700

Dr. Ioannis Karkatzounis, MD is an internist in Oshkosh, WI specializing in internal medicine (adult medicine), hospital medicine (hospitalist) and sleep medicine. He graduated from Demokritos University of Thrace in 1999 and has 27 years of experience. Dr. Ioannis Karkatzounis, MD is affiliated with OSF Healthcare.

Office Locations

855 N Westhaven Drive
Oshkosh, WI 54904

(920) 303-8700

(920) 456-7601

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Noteworthy Medicare Patient Procedures Performed by Dr. Ioannis Karkatzounis, MD in 2024

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

Top 5%

By Volume:

inpatient hospital care

In 2024, Dr. Ioannis Karkatzounis, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 95% of providers in related specialties within Wisconsin.

Top 25%

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2012, Dr. Ioannis Karkatzounis, 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 75% 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. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2012 were hospital care and inpatient care.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

doctor visit	89
hospital care	12
inpatient care	12

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2013 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

doctor visit	22
hospital care	369
inpatient care	250
outpatient care	103

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	93
Female	115

**Ethnicity**
Non-Hispanic White	196
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	72
From 75 to 84	49
85 and over	47
Less than 65	40

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2013

Hypertension	75
High Cholesterol	60
Stroke	10
Ischemic Heart Disease	49
Depression	35
Chronic Kidney Disease	39
Asthma	12
Osteoperosis	13
Atrial Fibrilation	19
Heart Failure	36
Chronic Obstructive Pulmonary Disease	38
Diabetes	45
Dementia	18
Cancer	14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2014 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	64
doctor visit	167
hospital care	785
inpatient care	571
outpatient care	165
sleep study	129

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	211
Female	269

**Ethnicity**
Non-Hispanic White	451
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	172
From 75 to 84	103
85 and over	111
Less than 65	94

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2014

Hypertension	75
High Cholesterol	59
Stroke	8
Ischemic Heart Disease	46
Depression	31
Chronic Kidney Disease	40
Asthma	10
Osteoperosis	9
Atrial Fibrilation	23
Heart Failure	41
Chronic Obstructive Pulmonary Disease	35
Diabetes	39
Dementia	18
Cancer	15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2015 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	82
doctor visit	226
hospital care	1148
inpatient care	851
outpatient care	252
sleep study	136

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	664
Female	758

**Ethnicity**
Non-Hispanic White	1342
Black	0
Hispanic	46
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	488
From 75 to 84	390
85 and over	284
Less than 65	260

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2015

Hypertension	75
High Cholesterol	64
Stroke	9
Ischemic Heart Disease	48
Depression	30
Chronic Kidney Disease	44
Asthma	23
Osteoperosis	8
Atrial Fibrilation	25
Heart Failure	42
Chronic Obstructive Pulmonary Disease	34
Diabetes	44
Dementia	18
Cancer	15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2016 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	64
doctor visit	276
hospital care	1537
inpatient care	1140
outpatient care	344
sleep study	112

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	443
Female	506

**Ethnicity**
Non-Hispanic White	902
Black	0
Hispanic	21
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	329
From 75 to 84	278
85 and over	187
Less than 65	155

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2016

Hypertension	75
High Cholesterol	63
Stroke	8
Ischemic Heart Disease	49
Depression	34
Chronic Kidney Disease	48
Asthma	36
Osteoperosis	7
Atrial Fibrilation	24
Heart Failure	44
Chronic Obstructive Pulmonary Disease	35
Diabetes	41
Dementia	22
Cancer	15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2017 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	48
doctor visit	317
hospital care	1561
inpatient care	1237
outpatient care	266
sleep study	87

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	493
Female	515

**Ethnicity**
Non-Hispanic White	919
Black	40
Hispanic	37
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	350
From 75 to 84	267
85 and over	211
Less than 65	180

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2017

Hypertension	75
High Cholesterol	64
Stroke	11
Ischemic Heart Disease	52
Depression	37
Chronic Kidney Disease	51
Asthma	10
Osteoperosis	8
Atrial Fibrilation	25
Heart Failure	47
Chronic Obstructive Pulmonary Disease	37
Diabetes	44
Dementia	24
Cancer	15

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2018 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	70
doctor visit	340
hospital care	1652
inpatient care	1237
outpatient care	394
sleep study	121

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	442
Female	530

**Ethnicity**
Non-Hispanic White	894
Black	32
Hispanic	31
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	338
From 75 to 84	266
85 and over	189
Less than 65	179

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2018

Hypertension	75
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	45
Depression	34
Chronic Kidney Disease	50
Asthma	8
Osteoperosis	9
Atrial Fibrilation	24
Heart Failure	44
Chronic Obstructive Pulmonary Disease	36
Diabetes	39
Dementia	21
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2019 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	48
doctor visit	331
hospital care	1522
inpatient care	1019
outpatient care	483
sleep study	97

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	462
Female	519

**Ethnicity**
Non-Hispanic White	907
Black	20
Hispanic	30
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	364
From 75 to 84	288
85 and over	169
Less than 65	160

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2019

Hypertension	75
High Cholesterol	70
Stroke	9
Ischemic Heart Disease	49
Depression	34
Chronic Kidney Disease	52
Asthma	8
Osteoperosis	9
Atrial Fibrilation	23
Heart Failure	44
Chronic Obstructive Pulmonary Disease	38
Diabetes	41
Dementia	18
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2020 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	21
doctor visit	199
hospital care	1356
inpatient care	1068
outpatient care	288
sleep study	33

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	430
Female	480

**Ethnicity**
Non-Hispanic White	842
Black	17
Hispanic	35
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	332
From 75 to 84	258
85 and over	192
Less than 65	128

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2020

Hypertension	75
High Cholesterol	70
Stroke	8
Ischemic Heart Disease	49
Depression	34
Chronic Kidney Disease	54
Asthma	8
Osteoperosis	9
Atrial Fibrilation	24
Heart Failure	42
Chronic Obstructive Pulmonary Disease	33
Diabetes	40
Dementia	19
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2021 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	34
doctor visit	257
hospital care	1343
inpatient care	1127
outpatient care	216
sleep study	73

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	436
Female	486

**Ethnicity**
Non-Hispanic White	852
Black	27
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	354
From 75 to 84	279
85 and over	181
Less than 65	108

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2021

Hypertension	75
High Cholesterol	69
Stroke	9
Ischemic Heart Disease	50
Depression	32
Chronic Kidney Disease	50
Asthma	9
Osteoperosis	11
Atrial Fibrilation	23
Heart Failure	42
Chronic Obstructive Pulmonary Disease	32
Diabetes	41
Dementia	23
Cancer	13

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2022 were hospital care, inpatient care, outpatient care and sleep study.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

airway management	17
doctor visit	183
hospital care	950
inpatient care	838
outpatient care	112
sleep study	48

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	320
Female	406

**Ethnicity**
Non-Hispanic White	648
Black	40
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	275
From 75 to 84	247
85 and over	132
Less than 65	72

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	17
Ischemic Heart Disease	41
Depression	34
Chronic Kidney Disease	45
Asthma	14
Osteoperosis	14
Atrial Fibrilation	35
Heart Failure	43
Chronic Obstructive Pulmonary Disease	37
Diabetes	47
Dementia	17
Cancer	17

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

hospital care	927
inpatient care	927

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	209
Female	281

**Ethnicity**
Non-Hispanic White	467
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	158
From 75 to 84	156
85 and over	120
Less than 65	56

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	25
Ischemic Heart Disease	51
Depression	42
Chronic Kidney Disease	46
Asthma	13
Osteoperosis	19
Atrial Fibrilation	36
Heart Failure	53
Chronic Obstructive Pulmonary Disease	37
Diabetes	43
Dementia	22
Cancer	21

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI during 2024 were hospital care and inpatient care.

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

hospital care	797
inpatient care	797

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Male	170
Female	216

**Ethnicity**
Non-Hispanic White	359
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	119
From 75 to 84	125
85 and over	83
Less than 65	59

Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	28
Ischemic Heart Disease	54
Depression	43
Chronic Kidney Disease	45
Asthma	16
Osteoperosis	18
Atrial Fibrilation	41
Heart Failure	55
Chronic Obstructive Pulmonary Disease	38
Diabetes	47
Dementia	25
Cancer	20

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Ioannis Karkatzounis, MD for Medicare patients.

The highest averages for the top procedures that Dr. Ioannis Karkatzounis, MD treated as an internist in Oshkosh, WI were hospital care, inpatient care, outpatient care and sleep study.

airway management	49
doctor visit	218
hospital care	1073
inpatient care	851
outpatient care	262
sleep study	92

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Ioannis Karkatzounis, MD.

**Gender**
Female	390
Male	336

**Ethnicity**
Black / African American	13
Asian / Pacific Islander	0
Non-Hispanic White	675
Hispanic	19
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	146
75 to 84	208
Less than 65	114
65 to 74	257

Average of Total of Conditions of Medicare patients treated by Dr. Ioannis Karkatzounis, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Ioannis Karkatzounis, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	69
High Cholesterol	62
Stroke	10
Ischemic Heart Disease	44
Depression	32
Chronic Kidney Disease	43
Asthma	12
Osteoporosis	10
Heart Failure	41
Chronic Obstructive Pulmonary Disease	33
Diabetes	39
Atrial Fibrillation	24
Cancer	14
Dementia	18

Education & Training

Dr. Ioannis Karkatzounis, MD graduated from Demokritos University of Thrace in 1999. He completed residency at John Stroger Hospital of Cook County. He is certified by the American Board of Internal Medicine - Internal Medicine, American Board of Internal Medicine - Sleep Medicine and has a state license in Illinois.

Medical School: Demokritos University of Thrace (1999)

Residency: John Stroger Hospital of Cook County (2008)

Board Certification: American Board of Internal Medicine - Internal Medicine, American Board of Internal Medicine - Sleep Medicine (2008)

Licensed In: Illinois

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General Payments

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

**Payments by Company**
Harmony Biosciences LLC	$179 Wakix $179
Medtronic, Inc.	$111 INTERSTIM $111
Pfizer Inc.	$97 ELIQUIS $80	NURTEC ODT $17
Novartis Pharmaceuticals Corporation	$42 ENTRESTO $24	LEQVIO $18
Inari Medical, Inc.	$28 CT THROMBECTOMY SYSTEM KIT $28
Other	$136 VELTASSA $21	ANDEXXA $19	AVYCAZ $19	ORBACTIV $16	ELIQUIS $16	Other $45

**Types of Payments**
Food and Beverage	$593

Biography

Dr. Ioannis Karkatzounis is a hospital medicine (hospitalist) specialist in Oshkosh, WI. In addition to English, Dr. Karkatzounis (or staff) speaks Spanish, Greek, and French. In his practice, Dr. Karkatzounis focuses on sleep disorders. Dr. Karkatzounis is professionally affiliated with OSF Healthcare. Before performing his residency at John Stroger Hospital of Cook County, Dr. Karkatzounis attended Demokritos University of Thrace for medical school.