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Dr. John Gregory Niedzwicki, MD

(Dr. John Niedzwicki, M.D.)

(No ratings)

Specializes in: Medical Oncology, Adult Oncology and Hematology (Blood Disorders)
George Washington University School of Medicine and Health Sciences (1986)
535 Faunce Corner Road, Entrance A Second Floor
North Dartmouth, MA 02747

Dr. John Gregory Niedzwicki, MD is a medical oncologist in Dartmouth, MA specializing in medical oncology, adult oncology and hematology (blood disorders). He graduated from George Washington University School of Medicine and Health Sciences in 1986 and has 40 years of experience. Dr. John Gregory Niedzwicki, MD is affiliated with Brown University Health, St. Anne's Hospital and STEWARD MEDICAL GROUP INC.

View Doctor's Full Profile (508) 996-3991

Office Locations

535 Faunce Corner Road
Dartmouth, MA 02747
open_in_new

St. Anne's Hospital

535 Faunce Corner Road, Entrance A Second Floor
North Dartmouth, MA 02747
(508) 996-3991
open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. John Gregory Niedzwicki, MD in 2023

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

Top 5%

By Volume:

blood draw
creatinine blood test
electrolyte panel
intravenous infusion
lab tests
liver panel
phlebotomy for lab tests
white blood cell differential

By Affordability:

creatinine test
folic acid tests
iron tests
kidney function tests
serum folate test
vitamin B12 test

In 2023, among providers in related specialties within Massachusetts, Dr. John Gregory Niedzwicki, MD performed more blood draw, creatinine blood test, electrolyte panel, intravenous (IV) infusion, lab tests, liver panel, phlebotomy for lab tests, and white blood cell (WBC) differential procedures for Medicare patients than 95% of them and he also had a list price for creatinine test, folic acid tests, iron tests, kidney function tests, serum folate test, and vitamin B12 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 Volume:

complete blood count

In 2023, Dr. John Gregory Niedzwicki, MD performed more complete blood count (CBC) procedures for Medicare patients than 90% of providers in related specialties within Massachusetts.

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2013 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 51
biological response modifier (BRM) therapy 251
blood draw 610
breast procedures 44
chemotherapy 251
CT scan 124
diagnostic imaging 18
doctor visit 1230
hormone therapy 62
hospital care 112
inpatient care 112
lab tests 1409
minimally invasive procedures 312
musculoskeletal imaging 14
nuclear scan 14
pelvic imaging 51
port flush 35
preventive care 26
thoracic (chest) imaging 73
women's imaging 44
X-rays 44

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 196
Female 331
Ethnicity
Non-Hispanic White 456
Black 16
Hispanic 34
Asian 0
Other 0
Native American 0
Age
From 65 to 74 174
From 75 to 84 192
85 and over 93
Less than 65 68

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2013

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2013 were hypertension, high cholesterol, cancer and ischemic heart disease.

Hypertension 70
High Cholesterol 64
Stroke 4
Ischemic Heart Disease 35
Depression 21
Chronic Kidney Disease 22
Asthma 8
Osteoperosis 9
Atrial Fibrilation 14
Heart Failure 23
Chronic Obstructive Pulmonary Disease 18
Diabetes 34
Dementia 9
Cancer 61

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2014 were CT scan, inpatient care, hospital care and thoracic (chest) imaging.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 58
blood draw 32
breast procedures 50
CT scan 153
diagnostic imaging 17
doctor visit 1169
hospital care 122
inpatient care 122
lab tests 12
pelvic imaging 58
preventive care 33
thoracic (chest) imaging 95
women's imaging 50
X-rays 50

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 166
Female 305
Ethnicity
Non-Hispanic White 406
Black 0
Hispanic 35
Asian 0
Other 14
Native American 0
Age
From 65 to 74 156
From 75 to 84 177
85 and over 86
Less than 65 52

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2014

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2014 were hypertension, high cholesterol, cancer and diabetes.

Hypertension 72
High Cholesterol 65
Stroke 5
Ischemic Heart Disease 32
Depression 24
Chronic Kidney Disease 24
Asthma 10
Osteoperosis 8
Atrial Fibrilation 14
Heart Failure 22
Chronic Obstructive Pulmonary Disease 19
Diabetes 35
Dementia 10
Cancer 63

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2015 were CT scan, thoracic (chest) imaging, inpatient care and hospital care.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 54
blood draw 13
breast procedures 78
CT scan 140
diagnostic imaging 24
doctor visit 1003
hospital care 83
inpatient care 83
lab tests 29
musculoskeletal imaging 15
nuclear scan 15
pelvic imaging 54
preventive care 54
thoracic (chest) imaging 86
women's imaging 78
X-rays 78

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 314
Female 576
Ethnicity
Non-Hispanic White 770
Black 0
Hispanic 64
Asian 0
Other 28
Native American 0
Age
From 65 to 74 330
From 75 to 84 316
85 and over 142
Less than 65 102

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2015

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2015 were hypertension, high cholesterol, cancer and diabetes.

Hypertension 72
High Cholesterol 68
Stroke 5
Ischemic Heart Disease 31
Depression 24
Chronic Kidney Disease 28
Asthma 17
Osteoperosis 8
Atrial Fibrilation 15
Heart Failure 21
Chronic Obstructive Pulmonary Disease 21
Diabetes 36
Dementia 11
Cancer 61

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2016 were lab tests, blood draw, minimally invasive procedures and CT scan.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 58
biological response modifier (BRM) therapy 56
blood draw 738
breast procedures 79
chemotherapy 56
CT scan 104
diagnostic imaging 31
doctor visit 1007
hormone therapy 74
lab tests 2195
minimally invasive procedures 259
pelvic imaging 43
port flush 47
preventive care 62
thoracic (chest) imaging 61
ultrasound (sonogram) 15
vaccines 14
women's imaging 79
X-rays 79

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 185
Female 340
Ethnicity
Non-Hispanic White 459
Black 0
Hispanic 36
Asian 0
Other 15
Native American 0
Age
From 65 to 74 200
From 75 to 84 160
85 and over 75
Less than 65 90

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2016

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2016 were high cholesterol, hypertension, cancer and diabetes.

Hypertension 70
High Cholesterol 70
Stroke 5
Ischemic Heart Disease 30
Depression 26
Chronic Kidney Disease 30
Asthma 27
Osteoperosis 10
Atrial Fibrilation 14
Heart Failure 17
Chronic Obstructive Pulmonary Disease 20
Diabetes 32
Dementia 9
Cancer 47

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2017 were lab tests, blood draw, minimally invasive procedures and hormone therapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 43
biological response modifier (BRM) therapy 80
blood draw 977
breast procedures 101
chemotherapy 80
CT scan 101
diagnostic imaging 34
doctor visit 1160
hormone therapy 140
lab tests 2558
minimally invasive procedures 521
musculoskeletal imaging 17
nuclear scan 17
pelvic imaging 43
port flush 40
preventive care 67
thoracic (chest) imaging 58
women's imaging 101
X-rays 101

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 210
Female 383
Ethnicity
Non-Hispanic White 508
Black 24
Hispanic 43
Asian 0
Other 0
Native American 0
Age
From 65 to 74 220
From 75 to 84 178
85 and over 91
Less than 65 104

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2017

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2017 were hypertension, high cholesterol, cancer and diabetes.

Hypertension 69
High Cholesterol 65
Stroke 5
Ischemic Heart Disease 31
Depression 26
Chronic Kidney Disease 32
Asthma 12
Osteoperosis 9
Atrial Fibrilation 13
Heart Failure 18
Chronic Obstructive Pulmonary Disease 20
Diabetes 33
Dementia 8
Cancer 42

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2018 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 46
biological response modifier (BRM) therapy 110
blood draw 1013
breast procedures 97
chemotherapy 110
CT scan 67
diagnostic imaging 13
doctor visit 1182
hormone therapy 105
lab tests 3031
minimally invasive procedures 636
pelvic imaging 32
preventive care 84
thoracic (chest) imaging 35
ultrasound (sonogram) 14
women's imaging 97
X-rays 97

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 211
Female 387
Ethnicity
Non-Hispanic White 519
Black 18
Hispanic 43
Asian 0
Other 0
Native American 0
Age
From 65 to 74 233
From 75 to 84 167
85 and over 97
Less than 65 101

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2018

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2018 were high cholesterol, hypertension, cancer and diabetes.

Hypertension 68
High Cholesterol 71
Stroke 6
Ischemic Heart Disease 33
Depression 26
Chronic Kidney Disease 32
Asthma 13
Osteoperosis 10
Atrial Fibrilation 14
Heart Failure 20
Chronic Obstructive Pulmonary Disease 20
Diabetes 34
Dementia 8
Cancer 37

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2019 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 23
biological response modifier (BRM) therapy 178
blood draw 1130
breast procedures 87
chemotherapy 178
CT scan 52
doctor visit 1150
hormone therapy 94
lab tests 3642
minimally invasive procedures 906
pelvic imaging 23
preventive care 98
thoracic (chest) imaging 29
vaccines 11
women's imaging 87
X-rays 87

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 211
Female 404
Ethnicity
Non-Hispanic White 536
Black 0
Hispanic 40
Asian 0
Other 21
Native American 0
Age
From 65 to 74 217
From 75 to 84 201
85 and over 95
Less than 65 102

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2019

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2019 were high cholesterol, hypertension, cancer and chronic kidney disease.

Hypertension 71
High Cholesterol 75
Stroke 5
Ischemic Heart Disease 36
Depression 28
Chronic Kidney Disease 37
Asthma 15
Osteoperosis 11
Atrial Fibrilation 17
Heart Failure 21
Chronic Obstructive Pulmonary Disease 20
Diabetes 35
Dementia 10
Cancer 38

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2020 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

biological response modifier (BRM) therapy 165
blood draw 1253
breast procedures 79
chemotherapy 165
CT scan 18
doctor visit 945
lab tests 3684
minimally invasive procedures 905
preventive care 79
thoracic (chest) imaging 18
women's imaging 79
X-rays 79

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 207
Female 403
Ethnicity
Non-Hispanic White 527
Black 0
Hispanic 50
Asian 0
Other 20
Native American 0
Age
From 65 to 74 227
From 75 to 84 194
85 and over 87
Less than 65 102

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2020

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2020 were high cholesterol, hypertension, chronic kidney disease and diabetes.

Hypertension 69
High Cholesterol 73
Stroke 5
Ischemic Heart Disease 35
Depression 30
Chronic Kidney Disease 38
Asthma 16
Osteoperosis 13
Atrial Fibrilation 15
Heart Failure 20
Chronic Obstructive Pulmonary Disease 18
Diabetes 36
Dementia 10
Cancer 32

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2021 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

abdominal imaging 14
biological response modifier (BRM) therapy 122
blood draw 1507
breast procedures 73
chemotherapy 122
CT scan 32
doctor visit 1170
lab tests 4192
minimally invasive procedures 1129
pelvic imaging 14
preventive care 73
thoracic (chest) imaging 18
women's imaging 73
X-rays 73

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 223
Female 426
Ethnicity
Non-Hispanic White 564
Black 0
Hispanic 52
Asian 0
Other 0
Native American 0
Age
From 65 to 74 216
From 75 to 84 233
85 and over 99
Less than 65 101

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2021

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2021 were high cholesterol, hypertension, chronic kidney disease and diabetes.

Hypertension 69
High Cholesterol 75
Stroke 6
Ischemic Heart Disease 35
Depression 29
Chronic Kidney Disease 40
Asthma 14
Osteoperosis 15
Atrial Fibrilation 15
Heart Failure 23
Chronic Obstructive Pulmonary Disease 21
Diabetes 36
Dementia 10
Cancer 33

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2022 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

biological response modifier (BRM) therapy 78
blood draw 1424
chemotherapy 78
doctor visit 1104
lab tests 3914
minimally invasive procedures 1069

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 210
Female 414
Ethnicity
Non-Hispanic White 531
Black 0
Hispanic 50
Asian 0
Other 27
Native American 0
Age
From 65 to 74 189
From 75 to 84 243
85 and over 88
Less than 65 104

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2022

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2022 were high cholesterol, hypertension, diabetes and cancer.

Hypertension 75
High Cholesterol 75
Stroke 10
Ischemic Heart Disease 33
Depression 30
Chronic Kidney Disease 30
Asthma 21
Osteoperosis 21
Atrial Fibrilation 24
Heart Failure 21
Chronic Obstructive Pulmonary Disease 23
Diabetes 38
Dementia 7
Cancer 34

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2023 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

biological response modifier (BRM) therapy 92
blood draw 1363
chemotherapy 92
doctor visit 996
lab tests 3717
minimally invasive procedures 990

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 183
Female 384
Ethnicity
Non-Hispanic White 489
Black 0
Hispanic 41
Asian 0
Other 22
Native American 0
Age
From 65 to 74 181
From 75 to 84 235
85 and over 75
Less than 65 76

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD in 2023

The most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated during 2023 were high cholesterol, hypertension, diabetes and cancer.

Hypertension 75
High Cholesterol 75
Stroke 8
Ischemic Heart Disease 32
Depression 31
Chronic Kidney Disease 33
Asthma 20
Osteoperosis 22
Atrial Fibrilation 25
Heart Failure 21
Chronic Obstructive Pulmonary Disease 24
Diabetes 37
Dementia 5
Cancer 33

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2013 - 2023

Volume of procedures performed by Dr. John Gregory Niedzwicki, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA were lab tests, blood draw, minimally invasive procedures and chemotherapy.

abdominal imaging 43
biological response modifier (BRM) therapy 125
blood draw 914
breast procedures 76
chemotherapy 125
CT scan 87
diagnostic imaging 22
doctor visit 1101
hormone therapy 95
hospital care 105
inpatient care 105
lab tests 2580
minimally invasive procedures 747
musculoskeletal imaging 15
nuclear scan 15
pelvic imaging 39
preventive care 64
thoracic (chest) imaging 52
ultrasound (sonogram) 14
vaccines 12
women's imaging 76
X-rays 76

Average Medicare Patient Data From 2013 - 2023

Information about Medicare patients treated by Dr. John Gregory Niedzwicki, MD.

Gender
Male 210
Female 395
Ethnicity
Black / African American 5
Asian / Pacific Islander 0
Non-Hispanic White 524
Native American / Alaskan Native 0
Hispanic 44
Other 13
Age
75 to 84 208
85 and over 93
Less than 65 91
65 to 74 213

Average of Total of Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, MD From 2013 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. John Gregory Niedzwicki, MD treated were high cholesterol, hypertension, cancer and diabetes.

Hypertension 70
High Cholesterol 70
Stroke 5
Ischemic Heart Disease 33
Depression 26
Chronic Kidney Disease 31
Asthma 15
Osteoporosis 12
Heart Failure 20
Chronic Obstructive Pulmonary Disease 20
Diabetes 35
Atrial Fibrillation 16
Dementia 8
Cancer 43

Education & Training

Dr. John Gregory Niedzwicki, MD graduated from George Washington University School of Medicine and Health Sciences in 1986. He completed residency at Roger Williams Medical Center. He has a state license in Massachusetts.

Medical School: George Washington University School of Medicine and Health Sciences (1986)

Residency: Roger Williams Medical Center

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. John Gregory Niedzwicki, MD is associated with these hospitals and organizations:

Brown University Health
St. Anne's Hospital
STEWARD MEDICAL GROUP INC

Ratings & Reviews

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General Payments

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

Payments by Company
Astellas Pharma US Inc $200
$200
Pharmacyclics LLC, An AbbVie Company $150 IMBRUVICA
$150
E.R. Squibb & Sons, L.L.C. $62 SPRYCEL
$34 		OPDIVO
$28
Pfizer Inc. $17 INFLECTRA
$17
Types of Payments
Education $384
Food and Beverage $44

Biography

Dr. John Niedzwicki specializes in adult oncology, medical oncology, and hematology (blood disorders) and practices in Dartmouth, MA and North Dartmouth, MA. He obtained his medical school training at George Washington University School of Medicine and Health Sciences and performed his residency at Roger Williams Medical Center. Dr. Niedzwicki's professional affiliations include Brown University Health and St. Anne's Hospital.

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