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Dr. John Constantine Gretes, MD

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Specializes in: Adult Nephrology

Duke University School of Medicine (1972)

739 Thimble Shoals Boulevard Suite 801
Newport News, VA 23606

(757) 873-1009

Dr. John Constantine Gretes, MD is a nephrologist in Newport News, VA specializing in adult nephrology. He graduated from Duke University School of Medicine in 1972 and has 54 years of experience. Dr. John Constantine Gretes, MD is affiliated with Riverside Medical Group.

Office Locations

739 Thimble Shoals Boulevard Suite 801
Newport News, VA 23606

(757) 873-1009

(757) 873-7689

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7552 Hospital Drive Suite 302
Gloucester, VA 23061

(804) 693-9062

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In The News

“The family expresses their sincere gratitude to Dr. John Gretes and his staff as well as the medical teams of Riverside Regional Medical Center.”—"MARY LOUISE PUSATERI", The Virginian-Pilot, June 2008

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2012 were lab tests, blood draw, hospital care and inpatient care.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

blood draw	598
dialysis	139
doctor visit	666
hospital care	529
inpatient care	529
lab tests	890
preventive care	15
thyroid function tests	21

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2013 were lab tests, blood draw, hospital care and inpatient care.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

blood draw	536
dialysis	57
doctor visit	1013
hospital care	204
inpatient care	204
lab tests	969
preventive care	14
thyroid function tests	18

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	202
Female	246

**Ethnicity**
Non-Hispanic White	323
Black	114
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	163
From 75 to 84	154
85 and over	78
Less than 65	53

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2013

Hypertension	75
High Cholesterol	62
Stroke	7
Ischemic Heart Disease	46
Depression	18
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	6
Atrial Fibrilation	16
Heart Failure	40
Chronic Obstructive Pulmonary Disease	16
Diabetes	52
Dementia	13
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2014 were hospital care, inpatient care, dialysis and blood draw.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

blood draw	46
dialysis	69
doctor visit	1250
hospital care	483
inpatient care	483
lab tests	34

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	281
Female	303

**Ethnicity**
Non-Hispanic White	445
Black	128
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	204
From 75 to 84	219
85 and over	101
Less than 65	60

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2014

Hypertension	75
High Cholesterol	59
Stroke	8
Ischemic Heart Disease	47
Depression	21
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	7
Atrial Fibrilation	19
Heart Failure	52
Chronic Obstructive Pulmonary Disease	20
Diabetes	51
Dementia	16
Cancer	15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2015 were hospital care, inpatient care, dialysis and outpatient care.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	155
doctor visit	1347
hospital care	413
inpatient care	398
outpatient care	15

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	566
Female	608

**Ethnicity**
Non-Hispanic White	922
Black	224
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	436
From 75 to 84	416
85 and over	190
Less than 65	132

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2015

Hypertension	75
High Cholesterol	64
Stroke	6
Ischemic Heart Disease	46
Depression	23
Chronic Kidney Disease	75
Asthma	14
Osteoperosis	6
Atrial Fibrilation	18
Heart Failure	50
Chronic Obstructive Pulmonary Disease	22
Diabetes	56
Dementia	14
Cancer	15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2016 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	128
doctor visit	1172
hospital care	410
inpatient care	410

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	288
Female	313

**Ethnicity**
Non-Hispanic White	461
Black	123
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	232
From 75 to 84	214
85 and over	97
Less than 65	58

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2016

Hypertension	75
High Cholesterol	68
Stroke	8
Ischemic Heart Disease	48
Depression	24
Chronic Kidney Disease	75
Asthma	25
Osteoperosis	6
Atrial Fibrilation	20
Heart Failure	45
Chronic Obstructive Pulmonary Disease	23
Diabetes	53
Dementia	15
Cancer	12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2017 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	122
doctor visit	1015
hospital care	406
inpatient care	406
lab tests	53

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	302
Female	285

**Ethnicity**
Non-Hispanic White	455
Black	118
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	219
From 75 to 84	197
85 and over	104
Less than 65	67

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2017

Hypertension	75
High Cholesterol	62
Stroke	7
Ischemic Heart Disease	49
Depression	27
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	8
Atrial Fibrilation	20
Heart Failure	44
Chronic Obstructive Pulmonary Disease	26
Diabetes	53
Dementia	16
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2018 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	158
doctor visit	1095
hospital care	362
inpatient care	362
lab tests	27

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	320
Female	318

**Ethnicity**
Non-Hispanic White	478
Black	137
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	228
85 and over	86
Less than 65	68

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2018

Hypertension	75
High Cholesterol	71
Stroke	6
Ischemic Heart Disease	48
Depression	24
Chronic Kidney Disease	75
Asthma	6
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	41
Chronic Obstructive Pulmonary Disease	21
Diabetes	56
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2019 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	113
doctor visit	1094
hospital care	273
inpatient care	273

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Ethnicity**
Non-Hispanic White	514
Black	147
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	0
85 and over	101
Less than 65	70

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	5
Ischemic Heart Disease	45
Depression	25
Chronic Kidney Disease	75
Asthma	6
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	40
Chronic Obstructive Pulmonary Disease	21
Diabetes	56
Dementia	13
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2020 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	122
doctor visit	794
hospital care	454
inpatient care	454

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	336
Female	282

**Ethnicity**
Non-Hispanic White	461
Black	132
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	219
From 75 to 84	241
85 and over	85
Less than 65	73

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2020

Hypertension	75
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	46
Depression	25
Chronic Kidney Disease	75
Asthma	5
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	40
Chronic Obstructive Pulmonary Disease	20
Diabetes	56
Dementia	15
Cancer	15

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2021 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	117
doctor visit	672
hospital care	309
inpatient care	309

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	287
Female	244

**Ethnicity**
Non-Hispanic White	425
Black	87
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	190
From 75 to 84	225
85 and over	71
Less than 65	45

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	45
Depression	23
Chronic Kidney Disease	75
Asthma	6
Osteoperosis	9
Atrial Fibrilation	19
Heart Failure	39
Chronic Obstructive Pulmonary Disease	20
Diabetes	58
Dementia	13
Cancer	16

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA during 2022 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

dialysis	66
doctor visit	579
hospital care	199
inpatient care	199

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	237
Female	209

**Ethnicity**
Non-Hispanic White	354
Black	71
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	149
From 75 to 84	193
85 and over	69
Less than 65	35

Conditions of Medicare patients treated by Dr. John Constantine Gretes, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	41
Depression	24
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	13
Atrial Fibrilation	31
Heart Failure	35
Chronic Obstructive Pulmonary Disease	23
Diabetes	53
Dementia	11
Cancer	23

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John Constantine Gretes, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Constantine Gretes, MD treated as a nephrologist in Newport News, VA were lab tests, blood draw, hospital care and inpatient care.

blood draw	393
dialysis	113
doctor visit	972
hospital care	367
inpatient care	366
lab tests	394
outpatient care	15
preventive care	14
thyroid function tests	19

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John Constantine Gretes, MD.

**Gender**
Male	256
Female	255

**Ethnicity**
Black / African American	116
Asian / Pacific Islander	0
Non-Hispanic White	439
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	189
85 and over	89
Less than 65	60
65 to 74	211

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

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

Hypertension	68
High Cholesterol	62
Stroke	6
Ischemic Heart Disease	41
Depression	21
Chronic Kidney Disease	68
Asthma	8
Osteoporosis	7
Heart Failure	38
Chronic Obstructive Pulmonary Disease	19
Diabetes	49
Atrial Fibrillation	17
Cancer	13
Dementia	12

Education & Training

Dr. John Constantine Gretes, MD graduated from Duke University School of Medicine in 1972. He has a state license in Virginia.

Medical School: Duke University School of Medicine (1972)

Licensed In: Virginia

Affiliations & Hospitals

Dr. John Constantine Gretes, MD is associated with these hospitals and organizations:

Riverside Medical Group

Ratings & Reviews

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General Payments

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

**Payments by Company**
Mallinckrodt LLC	$43,759 ACTHAR $43,759
Questcor Pharmaceuticals	$17,431 ACTHAR $17,431
Novartis Pharmaceuticals Corporation	$2,036 NON_BRAND $2,027	TEKTURNA $10
FOREST PHARMACEUTICALS, INC.	$1,219 BYSTOLIC $1,219
SANOFI-AVENTIS U.S. LLC	$845 RENVELA $845
Other	$1,733 ACTHAR $465	VELTASSA $143	Rayaldee $138	Myrbetriq $119	SAMSCA $114	Other $754

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$38,650
Honoraria	$14,400
Travel and Lodging	$6,889
Food and Beverage	$4,268
Compensation for serving as faculty or as a speaker for a non-accredited and noncertified continuing education program	$2,000
Other	$817

Biography

Dr. John Gretes specializes in adult nephrology and practices in Gloucester, VA and Newport News, VA. Dr. Gretes is professionally affiliated with Riverside Medical Group. He studied medicine at Duke University School of Medicine.