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Dr. John Michael Ioannou, MD

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Specializes in: Adult Nephrology

242 Merrick Road Suite 304
Rockville Centre, NY 11570

(516) 764-7070

Dr. John Michael Ioannou, MD is a nephrologist in Rockville Centre, NY specializing in adult nephrology. Dr. John Michael Ioannou, MD is affiliated with RWJBarnabas Health.

Office Locations

242 Merrick Road Suite 304
Rockville Centre, NY 11570

(516) 764-7070

(516) 764-7073

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364 Merrick Road
Rockville Centre, NY 11570

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Noteworthy Medicare Patient Procedures Performed by Dr. John Michael Ioannou, MD in 2024

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

Top 10%

By Volume:

inpatient hospital care

By Affordability:

thyroid blood test

thyroid function tests

vitamin D test

In 2024, among providers in related specialties within New York, Dr. John Michael Ioannou, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 90% of them and he also had a list price for thyroid blood test, thyroid function tests, and vitamin D test that was lower than the list prices billed to Medicare by 90% 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 25%

By Volume:

chronic care

lab tests

preventive care

By Affordability:

blood draw

blood draw for lab tests

cholesterol screening

creatinine test

creatinine urine test

iron tests

kidney function tests

lipid profile

magnesium test

phlebotomy for lab tests

phosphorus blood test

In 2012, among providers in related specialties within New York, Dr. John Michael Ioannou, MD performed more chronic care, lab tests, and preventive care procedures for Medicare patients than 75% of them and he also had a list price for blood draw, blood draw for lab tests, cholesterol screening, creatinine test, creatinine urine test, iron tests, kidney function tests, lipid profile, magnesium test, phlebotomy for lab tests, phosphorus blood test, phosphorus test, uric acid blood test, uric acid test, urinalysis, vascular procedures, vascular studies, and venipuncture (phlebotomy) 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. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2012 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

abdominal imaging	13
blood draw	35
dialysis	174
doctor visit	478
hospital care	1094
inpatient care	1094
lab tests	42
preventive care	25
ultrasound (sonogram)	13
vaccines	25

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2013 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

abdominal imaging	19
blood draw	56
dialysis	171
doctor visit	609
hospital care	1333
inpatient care	1333
lab tests	94
pelvic imaging	13
preventive care	33
ultrasound (sonogram)	32
vaccines	33

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	427
Female	387

**Ethnicity**
Non-Hispanic White	553
Black	190
Hispanic	44
Asian	12
Other	15
Native American	0

**Age**
From 65 to 74	235
From 75 to 84	236
85 and over	229
Less than 65	114

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2013

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	74
Depression	25
Chronic Kidney Disease	75
Asthma	12
Osteoperosis	6
Atrial Fibrilation	24
Heart Failure	64
Chronic Obstructive Pulmonary Disease	33
Diabetes	71
Dementia	31
Cancer	19

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2014 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	52
dialysis	183
doctor visit	595
hospital care	1162
inpatient care	1162
lab tests	94
preventive care	20
vaccines	20

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	433
Female	384

**Ethnicity**
Non-Hispanic White	529
Black	205
Hispanic	46
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	241
From 75 to 84	228
85 and over	216
Less than 65	132

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2014

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	73
Depression	25
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	6
Atrial Fibrilation	23
Heart Failure	65
Chronic Obstructive Pulmonary Disease	32
Diabetes	72
Dementia	30
Cancer	17

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2015 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	41
dialysis	223
doctor visit	605
hospital care	1502
inpatient care	1502
lab tests	123
preventive care	16
vaccines	16

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	962
Female	816

**Ethnicity**
Non-Hispanic White	1152
Black	432
Hispanic	114
Asian	28
Other	52
Native American	0

**Age**
From 65 to 74	566
From 75 to 84	492
85 and over	414
Less than 65	306

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2015

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	73
Depression	33
Chronic Kidney Disease	75
Asthma	24
Osteoperosis	9
Atrial Fibrilation	24
Heart Failure	63
Chronic Obstructive Pulmonary Disease	33
Diabetes	73
Dementia	33
Cancer	17

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2016 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	50
dialysis	235
doctor visit	701
hospital care	1514
inpatient care	1514
lab tests	147
preventive care	28
vaccines	28

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	500
Female	445

**Ethnicity**
Non-Hispanic White	614
Black	234
Hispanic	56
Asian	0
Other	24
Native American	0

**Age**
From 65 to 74	292
From 75 to 84	288
85 and over	211
Less than 65	154

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2016

Hypertension	75
High Cholesterol	75
Stroke	15
Ischemic Heart Disease	71
Depression	32
Chronic Kidney Disease	75
Asthma	33
Osteoperosis	8
Atrial Fibrilation	23
Heart Failure	59
Chronic Obstructive Pulmonary Disease	31
Diabetes	73
Dementia	30
Cancer	16

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2017 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	64
dialysis	168
doctor visit	658
hospital care	1323
inpatient care	1323
lab tests	90
preventive care	23
vaccines	23

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	484
Female	404

**Ethnicity**
Non-Hispanic White	581
Black	217
Hispanic	48
Asian	14
Other	28
Native American	0

**Age**
From 65 to 74	261
From 75 to 84	260
85 and over	199
Less than 65	168

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2017

Hypertension	75
High Cholesterol	75
Stroke	17
Ischemic Heart Disease	69
Depression	32
Chronic Kidney Disease	75
Asthma	10
Osteoperosis	7
Atrial Fibrilation	25
Heart Failure	57
Chronic Obstructive Pulmonary Disease	30
Diabetes	69
Dementia	30
Cancer	17

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2018 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	52
dialysis	155
doctor visit	694
hospital care	1452
inpatient care	1452
lab tests	82
preventive care	21
vaccines	21

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	504
Female	434

**Ethnicity**
Non-Hispanic White	609
Black	218
Hispanic	51
Asian	0
Other	36
Native American	0

**Age**
From 65 to 74	278
From 75 to 84	280
85 and over	220
Less than 65	160

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2018

Hypertension	75
High Cholesterol	75
Stroke	17
Ischemic Heart Disease	71
Depression	0
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	7
Atrial Fibrilation	25
Heart Failure	56
Chronic Obstructive Pulmonary Disease	31
Diabetes	69
Dementia	31
Cancer	17

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2019 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	54
dialysis	146
doctor visit	654
hospital care	1252
inpatient care	1252
lab tests	60
preventive care	20
vaccines	20

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	490
Female	406

**Ethnicity**
Non-Hispanic White	562
Black	224
Hispanic	51
Asian	0
Other	31
Native American	0

**Age**
From 65 to 74	268
From 75 to 84	295
85 and over	188
Less than 65	145

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	17
Ischemic Heart Disease	70
Depression	33
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	7
Atrial Fibrilation	26
Heart Failure	54
Chronic Obstructive Pulmonary Disease	33
Diabetes	68
Dementia	31
Cancer	18

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2020 were hospital care, inpatient care, dialysis and blood draw.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	42
dialysis	148
doctor visit	568
hospital care	1374
inpatient care	1374
lab tests	36

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	497
Female	417

**Ethnicity**
Non-Hispanic White	552
Black	232
Hispanic	61
Asian	0
Other	38
Native American	0

**Age**
From 65 to 74	296
From 75 to 84	287
85 and over	189
Less than 65	142

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2020

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	72
Depression	32
Chronic Kidney Disease	75
Asthma	11
Osteoperosis	6
Atrial Fibrilation	21
Heart Failure	54
Chronic Obstructive Pulmonary Disease	29
Diabetes	68
Dementia	32
Cancer	15

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2021 were hospital care, inpatient care, dialysis and blood draw.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	52
dialysis	173
doctor visit	615
hospital care	1235
inpatient care	1235
lab tests	44

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	443
Female	401

**Ethnicity**
Non-Hispanic White	524
Black	199
Hispanic	65
Asian	20
Other	36
Native American	0

**Age**
From 65 to 74	271
From 75 to 84	269
85 and over	179
Less than 65	125

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	18
Ischemic Heart Disease	70
Depression	31
Chronic Kidney Disease	75
Asthma	10
Osteoperosis	8
Atrial Fibrilation	22
Heart Failure	55
Chronic Obstructive Pulmonary Disease	25
Diabetes	67
Dementia	30
Cancer	16

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2022 were hospital care, inpatient care, lab tests and blood draw.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	226
diabetes management	33
dialysis	184
doctor visit	619
hospital care	1340
inpatient care	1340
lab tests	601
preventive care	101
thyroid function tests	15
vascular procedures	28

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	514
Female	453

**Ethnicity**
Non-Hispanic White	617
Black	221
Hispanic	56
Asian	0
Other	42
Native American	0

**Age**
From 65 to 74	303
From 75 to 84	351
85 and over	205
Less than 65	108

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	27
Ischemic Heart Disease	58
Depression	26
Chronic Kidney Disease	75
Asthma	15
Osteoperosis	13
Atrial Fibrilation	37
Heart Failure	48
Chronic Obstructive Pulmonary Disease	31
Diabetes	67
Dementia	24
Cancer	21

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2023 were hospital care, inpatient care, lab tests and blood draw.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	294
chronic care	159
diabetes management	79
dialysis	130
doctor visit	624
hospital care	1509
inpatient care	1509
lab tests	1282
preventive care	189
thyroid function tests	47
vascular procedures	79

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	574
Female	452

**Ethnicity**
Non-Hispanic White	644
Black	246
Hispanic	61
Asian	0
Other	44
Native American	0

**Age**
From 65 to 74	309
From 75 to 84	399
85 and over	198
Less than 65	120

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	26
Ischemic Heart Disease	56
Depression	28
Chronic Kidney Disease	75
Asthma	15
Osteoperosis	12
Atrial Fibrilation	35
Heart Failure	45
Chronic Obstructive Pulmonary Disease	29
Diabetes	67
Dementia	22
Cancer	23

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY during 2024 were lab tests, hospital care, inpatient care and chronic care.

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

blood draw	320
chronic care	364
diabetes management	116
dialysis	20
doctor visit	679
hospital care	1389
inpatient care	1389
lab tests	1903
preventive care	286
thyroid function tests	76
vaccines	37
vascular procedures	50

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Male	532
Female	399

**Ethnicity**
Non-Hispanic White	594
Black	212
Hispanic	50
Asian	34
Other	41
Native American	0

**Age**
From 65 to 74	283
From 75 to 84	358
85 and over	199
Less than 65	91

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	23
Ischemic Heart Disease	57
Depression	28
Chronic Kidney Disease	75
Asthma	18
Osteoperosis	9
Atrial Fibrilation	33
Heart Failure	46
Chronic Obstructive Pulmonary Disease	29
Diabetes	68
Dementia	23
Cancer	24

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. John Michael Ioannou, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Michael Ioannou, MD treated as a nephrologist in Rockville Centre, NY were inpatient care, hospital care, lab tests and chronic care.

abdominal imaging	16
blood draw	102
chronic care	261
diabetes management	76
dialysis	162
doctor visit	623
hospital care	1344
inpatient care	1344
lab tests	353
pelvic imaging	13
preventive care	69
thyroid function tests	46
ultrasound (sonogram)	22
vaccines	24
vascular procedures	52

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. John Michael Ioannou, MD.

**Gender**
Female	415
Male	489

**Ethnicity**
Black / African American	217
Asian / Pacific Islander	9
Non-Hispanic White	579
Hispanic	54
Native American / Alaskan Native	0
Other	29

**Age**
85 and over	203
75 to 84	287
Less than 65	135
65 to 74	277

Average of Total of Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD From 2012 - 2024

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

Hypertension	69
High Cholesterol	69
Stroke	17
Ischemic Heart Disease	62
Depression	25
Chronic Kidney Disease	69
Asthma	13
Osteoporosis	7
Heart Failure	51
Chronic Obstructive Pulmonary Disease	28
Diabetes	64
Atrial Fibrillation	24
Cancer	16
Dementia	26

Education & Training

He has a state license in New York.

Licensed In: New York

Ratings & Reviews

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General Payments

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

**Payments by Company**
Otsuka America Pharmaceutical, Inc.	$1,499 JYNARQUE $982	SAMSCA $480	VOYXACT $23	$15
AstraZeneca Pharmaceuticals LP	$1,103 LOKELMA $607	FARXIGA $484	XIGDUO $13
Bayer HealthCare Pharmaceuticals Inc.	$944 Kerendia $944
Amgen Inc.	$783 Sensipar $468	KRYSTEXXA $150	Parsabiv $118	Tavneos $48
Siemens Hearing Instruments, Inc.	$434 SHI - Hearing Products $434
Other	$5,647 ACTHAR $866	VELTASSA $647	Rayaldee $346	KRYSTEXXA $331	IBSRELA $282	Other $3,175

**Types of Payments**
Food and Beverage	$10,160
Education	$250

Biography

Dr. John Ioannou is a specialist in adult nephrology. Dr. Ioannou is affiliated with RWJBarnabas Health.

Select Year:

Dr. John Michael Ioannou, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John Michael Ioannou, MD in 2024

By Volume:

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. John Michael Ioannou, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. John Michael Ioannou, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

Other Providers in Rockville Centre, NY