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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

535 Faunce Corner Road, Entrance A Second Floor
North Dartmouth, MA 02747

(508) 996-3991

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. Dr. John Gregory Niedzwicki, MD is affiliated with Brown University Health and St. Anne's Hospital.

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

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

2012 Medicare Procedure Volume

The top procedures that Dr. John Gregory Niedzwicki, MD treated as a medical oncologist in Dartmouth, MA during 2012 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	77
biological response modifier (BRM) therapy	642
blood draw	1369
breast procedures	49
chemotherapy	642
CT scan	199
diagnostic imaging	22
doctor visit	1014
hormone therapy	224
hospital care	151
inpatient care	151
lab tests	3151
minimally invasive procedures	704
musculoskeletal imaging	25
nuclear scan	25
pelvic imaging	77
port flush	72
preventive care	45
thoracic (chest) imaging	122
thyroid function tests	54
vaccines	18
women's imaging	49
X-rays	49

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

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

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

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

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

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

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

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

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

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

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

Average Medicare Procedure Volume From 2012 - 2022

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	47
biological response modifier (BRM) therapy	186
blood draw	915
breast procedures	73
chemotherapy	186
CT scan	99
diagnostic imaging	22
doctor visit	1103
hormone therapy	116
hospital care	117
inpatient care	117
lab tests	2528
minimally invasive procedures	715
musculoskeletal imaging	17
nuclear scan	17
pelvic imaging	43
preventive care	62
thoracic (chest) imaging	59
thyroid function tests	54
ultrasound (sonogram)	14
vaccines	14
women's imaging	73
X-rays	73

Average Medicare Patient Data From 2012 - 2022

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

**Gender**
Female	360
Male	193

**Ethnicity**
Black / African American	5
Asian / Pacific Islander	0
Non-Hispanic White	479
Native American / Alaskan Native	0
Hispanic	40
Other	11

**Age**
85 and over	86
75 to 84	187
Less than 65	84
65 to 74	196

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

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	64
High Cholesterol	63
Stroke	5
Ischemic Heart Disease	30
Depression	24
Chronic Kidney Disease	28
Asthma	13
Osteoporosis	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	18
Diabetes	31
Atrial Fibrillation	14
Dementia	8
Cancer	40

Education & Training

Dr. John Gregory Niedzwicki, MD graduated from George Washington University School of Medicine and Health Sciences. 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

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

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 is an adult oncology, medical oncology, and hematology (blood disorders) specialist in Dartmouth, MA and North Dartmouth, MA. He studied medicine at George Washington University School of Medicine and Health Sciences. He completed his residency training at Roger Williams Medical Center. Dr. Niedzwicki's hospital/clinic affiliations include Brown University Health and St. Anne's Hospital.

Select Year:

Dr. John Gregory Niedzwicki, MD

Office Locations

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

By Volume:

By Affordability:

By Volume:

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 Gregory Niedzwicki, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

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

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

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

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

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

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

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

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

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

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

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

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

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

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

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

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Gregory Niedzwicki, 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. John Gregory Niedzwicki, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

Other Providers in Dartmouth, MA