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Home > NJ Providers

Dr. John Nick Chafos, MD

(3 Ratings)

Specializes in: Internal Medicine (Adult Medicine), Family Medicine and Emergency Medicine

Tufts University School of Medicine

257 Rt 22 East
Green Brook, NJ 08812

(732) 968-8832

Dr. John Nick Chafos, MD is an internist in Green Brook, NJ specializing in internal medicine (adult medicine), family medicine and emergency medicine. He graduated from Tufts University School of Medicine. Dr. John Nick Chafos, MD is affiliated with RWJBarnabas Health and Robert Wood Johnson University Hospital Somerset.

Office Locations

Robert Wood Johnson University Hospital Somerset

257 Route 22 E
Green Brook, NJ 08812

(732) 968-7878

(732) 968-7557

open_in_new

257 Rt 22 East
Green Brook, NJ 08812

(732) 968-8832

(732) 968-2187

open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. John Nick Chafos, MD in 2023

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

Top 5%

By Volume:

phlebotomy for lab tests

screening test

urinalysis

By Affordability:

blood draw for lab tests

breathing treatment

cholesterol screening

glycated protein test

impacted ear wax removal

influenza tests

lipid profile

metabolic panel

phlebotomy for lab tests

In 2023, among providers in related specialties within New Jersey, Dr. John Nick Chafos, MD performed more A1C test, blood draw, complete blood count (CBC), lab tests, phlebotomy for lab tests, screening test, and urinalysis procedures for Medicare patients than 95% of them and he also had a list price for A1C test, antigen tests, blood count tests, blood draw, blood draw for lab tests, breathing treatment, cholesterol screening, complete blood count (CBC), diabetes screening, ear procedures, ear wax removal, glycated protein test, impacted ear wax removal, influenza tests, lipid profile, metabolic panel, phlebotomy for lab tests, rapid flu test, rapid strep test, urinalysis, and venipuncture (phlebotomy) 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 Affordability:

lab tests

urine tests

In 2023, Dr. John Nick Chafos, MD had a list price for lab tests, and urine tests that was lower than the list prices billed to Medicare by 90% of providers in related specialties within New Jersey. 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:

breathing treatment

By Affordability:

In 2012, among providers in related specialties within New Jersey, Dr. John Nick Chafos, MD performed more breathing treatment procedures for Medicare patients than 75% of them and he also had a list price for blood glucose tests, blood tests, glucose tests, and X-rays 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 Nick Chafos, MD treated as an internist in Green Brook, NJ during 2012 were lab tests, preventive care, blood draw and thyroid function tests.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	64
ambulatory monitoring	26
aspiration	38
blood draw	1727
breathing treatment	205
cardiac procedures	80
diabetes management	232
doctor visit	4326
ear procedures	101
hip imaging	29
immobilization	42
injections	38
lab tests	8382
musculoskeletal imaging	117
preventive care	2122
sinus imaging	14
spinal procedures	80
thoracic (chest) imaging	452
thyroid function tests	1696
ultrasound (sonogram)	66
vaccines	301
vascular procedures	12
X-rays	742

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2013 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	111
abscess drainage	12
ambulatory monitoring	20
aspiration	49
blood draw	1915
breathing treatment	317
cardiac procedures	80
diabetes management	294
doctor visit	4845
ear procedures	89
hip imaging	26
incision and drainage	12
injections	49
lab tests	10040
minor procedures	12
musculoskeletal imaging	113
pelvic imaging	12
preventive care	2253
sinus imaging	24
skin surgery	12
spinal procedures	57
thoracic (chest) imaging	649
thyroid function tests	2082
ultrasound (sonogram)	125
vaccines	320
vascular procedures	34
X-rays	956

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	517
Female	809

**Ethnicity**
Non-Hispanic White	1155
Black	70
Hispanic	61
Asian	23
Other	17
Native American	0

**Age**
From 65 to 74	651
From 75 to 84	362
85 and over	157
Less than 65	156

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2013

Hypertension	65
High Cholesterol	61
Stroke	5
Ischemic Heart Disease	48
Depression	14
Chronic Kidney Disease	13
Asthma	8
Osteoperosis	5
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	28
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2014 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	121
abscess drainage	11
ambulatory monitoring	12
aspiration	36
blood draw	1705
breathing treatment	249
cardiac procedures	72
diabetes management	266
doctor visit	4182
ear procedures	78
hip imaging	35
incision and drainage	11
injections	36
lab tests	8937
minor procedures	11
musculoskeletal imaging	124
neck imaging	20
pelvic imaging	44
preventive care	1980
sinus imaging	14
skin surgery	11
spinal procedures	62
thoracic (chest) imaging	490
thyroid function tests	1820
ultrasound (sonogram)	279
vaccines	248
vascular procedures	98
X-rays	773

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	508
Female	716

**Ethnicity**
Non-Hispanic White	1063
Black	58
Hispanic	67
Asian	20
Other	16
Native American	0

**Age**
From 65 to 74	602
From 75 to 84	320
85 and over	148
Less than 65	154

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2014

Hypertension	62
High Cholesterol	60
Stroke	5
Ischemic Heart Disease	47
Depression	14
Chronic Kidney Disease	12
Asthma	8
Osteoperosis	5
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	29
Dementia	5
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2015 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	22
ambulatory monitoring	13
aspiration	24
blood draw	1069
breathing treatment	125
cardiac procedures	58
diabetes management	195
doctor visit	2434
ear procedures	44
hip imaging	15
injections	24
lab tests	5806
musculoskeletal imaging	52
pelvic imaging	11
preventive care	1460
spinal procedures	43
thoracic (chest) imaging	278
thyroid function tests	1253
ultrasound (sonogram)	80
vaccines	176
vascular procedures	24
X-rays	395

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	592
Female	922

**Ethnicity**
Non-Hispanic White	1326
Black	76
Hispanic	74
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	738
From 75 to 84	416
85 and over	184
Less than 65	176

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2015

Hypertension	64
High Cholesterol	59
Stroke	4
Ischemic Heart Disease	52
Depression	12
Chronic Kidney Disease	12
Asthma	10
Osteoperosis	4
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	29
Dementia	4
Cancer	10

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2016 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	18
aspiration	29
blood draw	1008
breathing treatment	108
cardiac procedures	73
diabetes management	192
doctor visit	2281
ear procedures	34
injections	29
lab tests	5423
musculoskeletal imaging	31
preventive care	1322
spinal procedures	54
thoracic (chest) imaging	240
thyroid function tests	1237
ultrasound (sonogram)	73
vaccines	164
X-rays	343

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	303
Female	472

**Ethnicity**
Non-Hispanic White	675
Black	35
Hispanic	40
Asian	12
Other	13
Native American	0

**Age**
From 65 to 74	393
From 75 to 84	216
85 and over	90
Less than 65	76

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2016

Hypertension	70
High Cholesterol	57
Stroke	5
Ischemic Heart Disease	51
Depression	11
Chronic Kidney Disease	16
Asthma	15
Osteoperosis	4
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	10
Diabetes	30
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2017 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	35
aspiration	17
blood draw	1068
breathing treatment	125
cardiac procedures	53
diabetes management	212
doctor visit	2470
ear procedures	39
injections	17
lab tests	5575
musculoskeletal imaging	49
preventive care	1427
spinal procedures	53
thoracic (chest) imaging	295
thyroid function tests	1292
ultrasound (sonogram)	53
vaccines	186
X-rays	432

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	359
Female	565

**Ethnicity**
Non-Hispanic White	799
Black	46
Hispanic	49
Asian	15
Other	15
Native American	0

**Age**
From 65 to 74	490
From 75 to 84	258
85 and over	95
Less than 65	81

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2017

Hypertension	68
High Cholesterol	37
Stroke	4
Ischemic Heart Disease	48
Depression	18
Chronic Kidney Disease	18
Asthma	6
Osteoperosis	4
Atrial Fibrilation	10
Heart Failure	11
Chronic Obstructive Pulmonary Disease	11
Diabetes	28
Dementia	5
Cancer	10

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2018 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	23
aspiration	14
blood draw	914
breathing treatment	97
cardiac procedures	53
diabetes management	245
doctor visit	2227
ear procedures	29
injections	14
lab tests	5313
musculoskeletal imaging	22
preventive care	1329
spinal procedures	26
thyroid function tests	1314
ultrasound (sonogram)	53
vaccines	132
X-rays	71

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	346
Female	467

**Ethnicity**
Non-Hispanic White	693
Black	49
Hispanic	47
Asian	11
Other	13
Native American	0

**Age**
From 65 to 74	423
From 75 to 84	207
85 and over	102
Less than 65	81

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2018

Hypertension	69
High Cholesterol	62
Stroke	7
Ischemic Heart Disease	53
Depression	18
Chronic Kidney Disease	19
Asthma	5
Osteoperosis	3
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	11
Diabetes	34
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2019 were lab tests, thyroid function tests, preventive care and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	13
aspiration	28
blood draw	759
breathing treatment	83
cardiac procedures	51
diabetes management	274
doctor visit	1729
ear procedures	36
injections	28
lab tests	4485
musculoskeletal imaging	28
preventive care	1173
spinal procedures	30
thoracic (chest) imaging	15
thyroid function tests	1195
ultrasound (sonogram)	51
vaccines	123
X-rays	98

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	265
Female	359

**Ethnicity**
Non-Hispanic White	540
Black	23
Hispanic	33
Asian	15
Other	13
Native American	0

**Age**
From 65 to 74	327
From 75 to 84	168
85 and over	76
Less than 65	53

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2019

Hypertension	69
High Cholesterol	63
Stroke	6
Ischemic Heart Disease	48
Depression	17
Chronic Kidney Disease	19
Asthma	8
Osteoperosis	4
Atrial Fibrilation	9
Heart Failure	15
Chronic Obstructive Pulmonary Disease	12
Diabetes	41
Dementia	5
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2020 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

abdominal imaging	15
aspiration	12
blood draw	526
breathing treatment	45
diabetes management	225
doctor visit	1355
ear procedures	18
injections	12
lab tests	2988
musculoskeletal imaging	17
preventive care	793
spinal procedures	16
thyroid function tests	726
vaccines	80
X-rays	48

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	253
Female	362

**Ethnicity**
Non-Hispanic White	521
Black	18
Hispanic	51
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	343
From 75 to 84	151
85 and over	68
Less than 65	53

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2020

Hypertension	63
High Cholesterol	59
Stroke	3
Ischemic Heart Disease	45
Depression	15
Chronic Kidney Disease	18
Asthma	7
Osteoperosis	5
Atrial Fibrilation	11
Heart Failure	15
Chronic Obstructive Pulmonary Disease	10
Diabetes	40
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2021 were lab tests, preventive care, thyroid function tests and blood draw.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

blood draw	261
cardiac procedures	16
diabetes management	125
doctor visit	1182
lab tests	1559
preventive care	412
thyroid function tests	403
ultrasound (sonogram)	16
vaccines	31

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	248
Female	361

**Ethnicity**
Non-Hispanic White	509
Black	26
Hispanic	45
Asian	15
Other	14
Native American	0

**Age**
From 65 to 74	327
From 75 to 84	178
85 and over	60
Less than 65	44

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2021

Hypertension	67
High Cholesterol	65
Stroke	4
Ischemic Heart Disease	45
Depression	16
Chronic Kidney Disease	19
Asthma	6
Osteoperosis	6
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	40
Dementia	6
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2022 were lab tests, blood draw, preventive care and diabetes management.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

blood draw	206
diabetes management	79
doctor visit	1080
lab tests	641
musculoskeletal imaging	13
preventive care	79
spinal procedures	11
X-rays	24

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	224
Female	279

**Ethnicity**
Non-Hispanic White	439
Black	17
Hispanic	28
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	257
From 75 to 84	161
85 and over	60
Less than 65	25

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	38
Depression	16
Chronic Kidney Disease	11
Asthma	9
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	12
Chronic Obstructive Pulmonary Disease	17
Diabetes	40
Dementia	4
Cancer	14

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ during 2023 were lab tests, blood draw, preventive care and diabetes management.

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

aspiration	15
blood draw	410
breathing treatment	26
diabetes management	214
doctor visit	1348
ear procedures	12
injections	15
lab tests	1154
preventive care	306
spinal procedures	16
X-rays	16

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	233
Female	293

**Ethnicity**
Non-Hispanic White	461
Black	0
Hispanic	32
Asian	0
Other	14
Native American	0

**Age**
From 65 to 74	254
From 75 to 84	169
85 and over	73
Less than 65	30

Conditions of Medicare patients treated by Dr. John Nick Chafos, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	39
Depression	17
Chronic Kidney Disease	11
Asthma	10
Osteoperosis	10
Atrial Fibrilation	19
Heart Failure	13
Chronic Obstructive Pulmonary Disease	16
Diabetes	40
Dementia	5
Cancer	14

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. John Nick Chafos, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Nick Chafos, MD treated as an internist in Green Brook, NJ were lab tests, thyroid function tests, preventive care and blood draw.

abdominal imaging	46
abscess drainage	11
ambulatory monitoring	17
aspiration	26
blood draw	964
cardiac procedures	59
diabetes management	212
doctor visit	2454
ear procedures	48
hip imaging	26
immobilization	42
incision and drainage	11
injections	26
lab tests	5025
minor procedures	11
musculoskeletal imaging	56
neck imaging	20
pelvic imaging	22
preventive care	1221
sinus imaging	17
skin surgery	11
spinal procedures	40
thoracic (chest) imaging	345
thyroid function tests	1301
ultrasound (sonogram)	88
vaccines	176
vascular procedures	42
X-rays	354

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. John Nick Chafos, MD.

**Gender**
Male	320
Female	467

**Ethnicity**
Black / African American	34
Asian / Pacific Islander	9
Non-Hispanic White	681
Hispanic	43
Native American / Alaskan Native	0
Other	9

**Age**
75 to 84	217
85 and over	92
Less than 65	77
65 to 74	400

Average of Total of Conditions of Medicare patients treated by Dr. John Nick Chafos, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. John Nick Chafos, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	62
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	42
Depression	14
Chronic Kidney Disease	14
Asthma	7
Osteoporosis	4
Heart Failure	13
Chronic Obstructive Pulmonary Disease	11
Diabetes	31
Atrial Fibrillation	10
Cancer	10
Dementia	4

Education & Training

Dr. John Nick Chafos, MD graduated from Tufts University School of Medicine. He completed residency at Morristown Memorial Hospital. He has a state license in New Jersey.

Medical School: Tufts University School of Medicine

Residency: Morristown Memorial Hospital

Licensed In: New Jersey

Affiliations & Hospitals

Dr. John Nick Chafos, MD is associated with these hospitals and organizations:

RWJBarnabas Health

Robert Wood Johnson University Hospital Somerset

Ratings & Reviews

Dr. John Nick Chafos, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 3 ratings. We collect ratings and reviews of Dr. John Nick Chafos, MD from all over the web to help you find the right in Green Brook, NJ.

Overall Rating

(3 Ratings)

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General Payments

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

**Payments by Company**
AstraZeneca Pharmaceuticals LP	$866 FARXIGA $469	CRESTOR $200	SYMBICORT $140	BYDUREON WEEKLY $26	BYDUREON PEN $16	Other $15
Novo Nordisk Inc	$741 Tresiba $321	Saxenda $134	Ozempic $88	RYBELSUS $88	Victoza $60	Other $50
GlaxoSmithKline, LLC.	$428 ANORO $115	BREO $88	TRELEGY ELLIPTA $77	FLOVENT $52	ANORO ELLIPTA $36	Other $60
Pfizer Inc.	$285 PAXLOVID $84	EUCRISA $75	ELIQUIS $65	PREVNAR 20 $25	PREVNAR - 13 $22	Other $13
AbbVie, Inc.	$278 Androgel $268	$10
Other	$2,702 XARELTO $129	TOUJEO $122	OXYCONTIN $101	VRAYLAR $97	Trintellix $95	Other $2,160

**Types of Payments**
Food and Beverage	$5,214
Education	$70
Gift	$15

Biography

Dr. John Chafos specializes in family medicine and emergency medicine. He is rated 5.0 stars (out of 5) by his patients. He is affiliated with Robert Wood Johnson University Hospital Somerset. Dr. Chafos's education and training includes medical school at Tufts University School of Medicine and residency at Morristown Memorial Hospital.