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Home > NC Providers > Otolaryngologists / Ear, Nose & Throat (ENT) Doctors

Dr. Gregory C. Zwack, MD

(Dr. Gregory Charles Zwack, MD)

(No ratings)

Specializes in: Otolaryngology (Ear, Nose, and Throat)

Thomas Jefferson University, Jefferson Medical College (1992)

6727 Parker Farm Drive
Wilmington, NC 28405

(910) 341-3300

Dr. Gregory C. Zwack, MD is an otolaryngologist in Wilmington, NC specializing in otolaryngology (ear, nose, and throat). He graduated from Thomas Jefferson University, Jefferson Medical College in 1992 and has 34 years of experience. Dr. Gregory C. Zwack, MD is affiliated with WILMINGTON HEALTH PLLC.

Office Locations

6727 Parker Farm Drive
Wilmington, NC 28405

(910) 341-3300

(910) 251-2067

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory C. Zwack, MD in 2023

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

Top 25%

By Volume:

impacted ear wax removal

In 2012, Dr. Gregory C. Zwack, MD performed more impacted ear wax removal procedures for Medicare patients than 75% of providers in related specialties within North Carolina.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2012 were ear procedures, lab tests, allergy testing and laryngeal (voice box) procedures.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

allergy testing	245
blood draw	39
CT scan	21
debridement (removal of unhealthy tissue)	14
diagnostic procedures	61
doctor visit	1164
ear procedures	344
excision	14
hospital care	21
inpatient care	21
lab tests	257
laryngeal (voice box) procedures	134
minimally invasive procedures	134
nosebleed treatment	20

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2013 were ear procedures, diagnostic procedures, immunotherapy and injections.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	31
CT scan	17
debridement (removal of unhealthy tissue)	20
diagnostic procedures	229
doctor visit	1162
ear procedures	515
excision	20
immunotherapy	168
injections	168
laryngeal (voice box) procedures	155
minimally invasive procedures	155
nosebleed treatment	14

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	424
Female	532

**Ethnicity**
Non-Hispanic White	778
Black	156
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	443
From 75 to 84	270
85 and over	104
Less than 65	139

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2013

Hypertension	68
High Cholesterol	65
Stroke	4
Ischemic Heart Disease	33
Depression	20
Chronic Kidney Disease	17
Asthma	6
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	15
Diabetes	35
Dementia	9
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2014 were lab tests, allergy testing, ear procedures and immunotherapy.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

allergy testing	469
blood draw	43
CT scan	11
debridement (removal of unhealthy tissue)	20
diagnostic procedures	50
doctor visit	1090
ear procedures	320
excision	20
immunotherapy	223
injections	223
lab tests	486
laryngeal (voice box) procedures	96
minimally invasive procedures	96
nosebleed treatment	12

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	425
Female	477

**Ethnicity**
Non-Hispanic White	751
Black	126
Hispanic	11
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	438
From 75 to 84	259
85 and over	90
Less than 65	115

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2014

Hypertension	70
High Cholesterol	67
Stroke	5
Ischemic Heart Disease	34
Depression	21
Chronic Kidney Disease	18
Asthma	5
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	33
Dementia	8
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2015 were lab tests, allergy testing, ear procedures and immunotherapy.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

allergy testing	338
blood draw	34
CT scan	21
doctor visit	1220
ear procedures	312
foreign body removal	13
immunotherapy	286
injections	286
lab tests	352
laryngeal (voice box) procedures	116
minimally invasive procedures	116
nosebleed treatment	16

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	894
Female	1222

**Ethnicity**
Non-Hispanic White	1784
Black	264
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	956
From 75 to 84	642
85 and over	264
Less than 65	254

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2015

Hypertension	70
High Cholesterol	66
Stroke	5
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	20
Asthma	12
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	13
Diabetes	31
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2016 were immunotherapy, injections, ear procedures and lab tests.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

allergy testing	232
blood draw	23
CT scan	19
doctor visit	1343
ear procedures	299
hospital care	13
immunotherapy	443
injections	443
inpatient care	13
lab tests	243
laryngeal (voice box) procedures	104
minimally invasive procedures	104
nosebleed treatment	17

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	497
Female	654

**Ethnicity**
Non-Hispanic White	934
Black	162
Hispanic	17
Asian	0
Other	21
Native American	0

**Age**
From 65 to 74	550
From 75 to 84	329
85 and over	119
Less than 65	153

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2016

Hypertension	72
High Cholesterol	65
Stroke	3
Ischemic Heart Disease	30
Depression	20
Chronic Kidney Disease	25
Asthma	19
Osteoperosis	8
Atrial Fibrilation	8
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	33
Dementia	7
Cancer	8

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2017 were immunotherapy, injections, ear procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	33
debridement (removal of unhealthy tissue)	23
diagnostic procedures	23
doctor visit	1043
ear procedures	221
excision	36
gynecologic procedures	23
hospital care	13
immunotherapy	234
injections	234
inpatient care	13
lab tests	17
laryngeal (voice box) procedures	80
minimally invasive procedures	129
nose surgery	49
nosebleed treatment	16
removal of lesion (e.g. growth)	23

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	413
Female	461

**Ethnicity**
Non-Hispanic White	726
Black	98
Hispanic	0
Asian	0
Other	24
Native American	0

**Age**
From 65 to 74	434
From 75 to 84	244
85 and over	89
Less than 65	107

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2017

Hypertension	73
High Cholesterol	59
Stroke	7
Ischemic Heart Disease	33
Depression	25
Chronic Kidney Disease	24
Asthma	8
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Dementia	8
Cancer	9

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2018 were ear procedures, minimally invasive procedures, immunotherapy and injections.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	20
debridement (removal of unhealthy tissue)	32
diagnostic procedures	32
doctor visit	998
ear procedures	227
excision	32
gynecologic procedures	32
hospital care	15
immunotherapy	99
injections	99
inpatient care	15
lab tests	14
laryngeal (voice box) procedures	72
minimally invasive procedures	116
nose surgery	44
nosebleed treatment	15
removal of lesion (e.g. growth)	32

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	381
Female	485

**Ethnicity**
Non-Hispanic White	714
Black	104
Hispanic	0
Asian	0
Other	26
Native American	0

**Age**
From 65 to 74	434
From 75 to 84	249
85 and over	84
Less than 65	99

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2018

Hypertension	71
High Cholesterol	69
Stroke	4
Ischemic Heart Disease	30
Depression	28
Chronic Kidney Disease	29
Asthma	9
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	14
Diabetes	31
Dementia	9
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2019 were ear procedures, immunotherapy, injections and minimally invasive procedures.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	23
CT scan	15
debridement (removal of unhealthy tissue)	25
diagnostic procedures	25
doctor visit	1058
ear procedures	267
endocrine surgery	11
excision	25
gynecologic procedures	25
hospital care	13
immunotherapy	95
injections	95
inpatient care	13
lab tests	16
laryngeal (voice box) procedures	69
minimally invasive procedures	94
neck surgery	11
nose surgery	25
nosebleed treatment	13
removal of lesion (e.g. growth)	25

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	420
Female	514

**Ethnicity**
Non-Hispanic White	806
Black	90
Hispanic	0
Asian	0
Other	21
Native American	0

**Age**
From 65 to 74	444
From 75 to 84	297
85 and over	103
Less than 65	90

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2019

Hypertension	74
High Cholesterol	69
Stroke	5
Ischemic Heart Disease	32
Depression	27
Chronic Kidney Disease	32
Asthma	6
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	15
Chronic Obstructive Pulmonary Disease	14
Diabetes	31
Dementia	10
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2020 were ear procedures, minimally invasive procedures, laryngeal (voice box) procedures and debridement (removal of unhealthy tissue).

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	24
debridement (removal of unhealthy tissue)	30
diagnostic procedures	30
doctor visit	968
ear procedures	197
excision	30
gynecologic procedures	30
hospital care	15
inpatient care	15
laryngeal (voice box) procedures	66
minimally invasive procedures	96
nose surgery	30
nosebleed treatment	19
removal of lesion (e.g. growth)	30

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	396
Female	420

**Ethnicity**
Non-Hispanic White	692
Black	82
Hispanic	0
Asian	12
Other	18
Native American	0

**Age**
From 65 to 74	413
From 75 to 84	262
85 and over	82
Less than 65	59

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2020

Hypertension	74
High Cholesterol	69
Stroke	5
Ischemic Heart Disease	32
Depression	26
Chronic Kidney Disease	35
Asthma	7
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	12
Chronic Obstructive Pulmonary Disease	13
Diabetes	32
Dementia	9
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2021 were lab tests, allergy testing, ear procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

allergy testing	354
blood draw	39
debridement (removal of unhealthy tissue)	28
diagnostic procedures	28
doctor visit	1020
ear procedures	227
endocrine surgery	11
excision	28
gynecologic procedures	28
lab tests	370
laryngeal (voice box) procedures	73
minimally invasive procedures	101
neck surgery	11
nose surgery	28
preventive care	36
removal of lesion (e.g. growth)	28
vaccines	36

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	411
Female	460

**Ethnicity**
Non-Hispanic White	735
Black	79
Hispanic	0
Asian	13
Other	32
Native American	0

**Age**
From 65 to 74	454
From 75 to 84	279
85 and over	84
Less than 65	54

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2021

Hypertension	70
High Cholesterol	71
Stroke	4
Ischemic Heart Disease	32
Depression	29
Chronic Kidney Disease	32
Asthma	6
Osteoperosis	9
Atrial Fibrilation	10
Heart Failure	13
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC during 2022 were ear procedures, minimally invasive procedures, laryngeal (voice box) procedures and nosebleed treatment.

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

blood draw	11
doctor visit	949
ear procedures	200
laryngeal (voice box) procedures	67
minimally invasive procedures	67
nosebleed treatment	13

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	386
Female	459

**Ethnicity**
Non-Hispanic White	729
Black	65
Hispanic	0
Asian	0
Other	31
Native American	0

**Age**
From 65 to 74	413
From 75 to 84	280
85 and over	93
Less than 65	59

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2022

Hypertension	74
High Cholesterol	75
Stroke	9
Ischemic Heart Disease	27
Depression	25
Chronic Kidney Disease	23
Asthma	9
Osteoperosis	12
Atrial Fibrilation	16
Heart Failure	13
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Dementia	5
Cancer	14

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gregory C. Zwack, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory C. Zwack, MD treated as an otolaryngologist in Wilmington, NC were allergy testing, ear procedures, immunotherapy and injections.

allergy testing	327
blood draw	29
CT scan	17
debridement (removal of unhealthy tissue)	24
diagnostic procedures	59
doctor visit	1092
ear procedures	284
endocrine surgery	11
excision	25
foreign body removal	13
gynecologic procedures	27
hospital care	15
immunotherapy	221
injections	221
inpatient care	15
lab tests	219
laryngeal (voice box) procedures	93
minimally invasive procedures	109
neck surgery	11
nose surgery	35
nosebleed treatment	15
preventive care	36
removal of lesion (e.g. growth)	27
vaccines	36

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gregory C. Zwack, MD.

**Gender**
Male	422
Female	516

**Ethnicity**
Black / African American	111
Asian / Pacific Islander	2
Non-Hispanic White	786
Native American / Alaskan Native	0
Hispanic	4
Other	15

**Age**
75 to 84	282
85 and over	101
Less than 65	102
65 to 74	452

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

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

Hypertension	65
High Cholesterol	61
Stroke	4
Ischemic Heart Disease	28
Depression	21
Chronic Kidney Disease	23
Asthma	7
Osteoporosis	7
Heart Failure	13
Chronic Obstructive Pulmonary Disease	13
Diabetes	28
Atrial Fibrillation	9
Dementia	7
Cancer	9

Education & Training

Dr. Gregory C. Zwack, MD graduated from Thomas Jefferson University, Jefferson Medical College in 1992. He has a state license in North Carolina.

Medical School: Thomas Jefferson University, Jefferson Medical College (1992)

Licensed In: North Carolina

Affiliations & Hospitals

Dr. Gregory C. Zwack, MD is associated with these hospitals and organizations:

WILMINGTON HEALTH PLLC

Ratings & Reviews

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General Payments

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

**Payments by Company**
Medtronic, Inc.	$1,140 STEALTHSTATION S8 PLATFORM $1,121	Propel $19
Intersect ENT, Inc.	$536 SINUVA $384	Propel $153
GlaxoSmithKline, LLC.	$263 NUCALA $190	BREO $46	TANZEUM $15	ADVAIR $12
GENZYME CORPORATION	$225 DUPIXENT $182	THYROGEN $43
Alcon Laboratories Inc	$183 Ciprodex $183
Other	$1,597 GRASTEK $130	Xhance $123	DUPIXENT $91	Synthroid $89	RHINAER STYLUS $87	Other $1,077

**Types of Payments**
Food and Beverage	$2,822
Travel and Lodging	$881
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$165
Consulting Fee	$75

Research Payments

Dr. Gregory C. Zwack, MD has received 7 research payments totaling $23,853.

Biography

Dr. Gregory Zwack works as an otolaryngology (ear, nose, and throat). He graduated from Thomas Jefferson University, Jefferson Medical College.

Select Year:

Dr. Gregory C. Zwack, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Gregory C. Zwack, MD in 2023

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. Gregory C. Zwack, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory C. Zwack, 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. Gregory C. Zwack, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Research Payments

Biography

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