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Dr. Mark T. Duffy, MD, PhD

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Specializes in: Ophthalmic Plastic Surgery

University of Illinois College of Medicine at Chicago

Professional interests include: ectropion (outward-turned eyelid), eyelid surgery, entropion repair, and more.

2253 W Mason St Green
Bay, WI 54303

(920) 327-7000

Dr. Mark T. Duffy, MD, PhD is an oculoplastic surgeon in Bay, WI specializing in ophthalmic plastic surgery. He graduated from University of Illinois College of Medicine at Chicago. Dr. Mark T. Duffy, MD, PhD is affiliated with Advocate Health Care, BayCare Clinic and BAYCARE CLINIC LLP.

Office Locations

BayCare Clinic

2253 W Mason St Green
Bay, WI 54303

(920) 327-7000

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Advocate Health Care

2253 W Mason Street Suite 100
Green Bay, WI 54303

(920) 327-7000

(920) 327-7005

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Some issues Dr. Mark T. Duffy, MD, PhD can help you with:

Blepharoplasty

Blepharoplasty is a surgical procedure to remove excess tissue around the eyelids. With aging, skin loses elasticity. In some people, skin can pool around the eyes causing wrinkles, puffiness, under-eye bags, and drooping.

During a blepharoplasty, tiny incisions are made under local anesthesia, and any excess skin or underlying tissue is removed from the eyelids. The procedure takes between one and three hours, and patients may have bruising and swelling around their eyes for a few days afterwards. Icing the area may help.

The surgery is sometimes done along with other facial surgery as part of a facelift. Typically, a blepharoplasty is considered cosmetic. In severe cases, however, upper eyelids may droop so significantly that they make it hard to see. In these cases, blepharoplasty may be considered a necessary treatment.

Eye Problems

Millions of people every year have problems with their eyes. Some of the most common eye problems are refractive disorders, glaucoma, diabetic retinopathy, macular degeneration, and cataracts.

Refractive disorders happen when the shape of the eye doesn't let allow someone focus very precisely. They might be myopic (nearsighted), hyperopic (farsighted), or have an astigmatism, which is a focus problem caused by the cornea. Refractive disorders can be corrected by glasses or contacts.

Glaucoma is the leading cause of blindness in the United States. It happens when fluid pressure builds up within the eye and damages the optic nerve. It is treated with medications and surgery.

Diabetic retinopathy is a common complication of diabetes. The retina is tissue at the back of the eye that is filled with numerous, tiny blood vessels. When diabetes damages these delicate blood vessels, they burst or leak, leading to blind spots and blurred vision. Diabetic retinopathy can be treated with laser therapy and surgery, but often vision cannot be restored.

Macular degeneration is common in older adults. The macula is the central part of the retina and is responsible for crisp center vision. Over time, the cells in the macula begin to die, making central vision blurry. An early symptom of macular degeneration is that straight lines appear wavy.

Cataracts happen when the clear lens in the front of the eye becomes cloudy, making things look blurry or faded. They are extremely common in older people. By age 80, more than half of all Americans will have had a cataract. In early stages, prescription glasses and magnifying lenses can help. As the cataracts get worse, surgery to replace the lens may be the best option.

More than just one of the five senses, the eyes are heavily relied upon to communicate, work, and get around every day. It's important to have regular eye exams for vision stays in good shape for years to come.

Noteworthy Medicare Patient Procedures Performed by Dr. Mark T. Duffy, MD, PhD in 2023

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

Top 5%

By Volume:

eyelid plastic surgery

eye procedures

facial plastic surgery

punctal dilation

upper lid blepharoplasty

visual field test

By Affordability:

lacrimal surgery

lacrimal procedures

In 2023, among providers in related specialties within Wisconsin, Dr. Mark T. Duffy, MD, PhD performed more eyelid plastic surgery, eye procedures, facial plastic surgery , punctal dilation, upper lid blepharoplasty, and visual field test procedures for Medicare patients than 95% of them and he also had a list price for lacrimal surgery, and lacrimal (tearing system) procedures 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:

extraocular surgery

In 2023, Dr. Mark T. Duffy, MD, PhD performed more extraocular surgery procedures for Medicare patients than 90% of providers in related specialties within Wisconsin.

Top 25%

By Affordability:

blepharoplasty

botulinum toxin injection for facial movement disorders

upper lid blepharoplasty

In 2012, Dr. Mark T. Duffy, MD, PhD had a list price for blepharoplasty, botulinum toxin injection for facial movement disorders, and upper lid blepharoplasty that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Wisconsin. 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. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2012 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	426
excision	27
eye procedures	306
injections	62
lacrimal (tearing system) procedures	35
minimally invasive procedures	62
plastic surgery procedures	118
removal of lesion (e.g. growth)	27

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2013 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	495
excision	38
eye procedures	407
injections	46
lacrimal (tearing system) procedures	38
minimally invasive procedures	46
plastic surgery procedures	199
removal of lesion (e.g. growth)	38

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	170
Female	264

**Ethnicity**
Non-Hispanic White	417
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	190
From 75 to 84	162
85 and over	46
Less than 65	36

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2013

Hypertension	63
High Cholesterol	56
Stroke	4
Ischemic Heart Disease	30
Depression	22
Chronic Kidney Disease	18
Asthma	7
Osteoperosis	6
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	10
Diabetes	27
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2014 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	438
excision	15
eye procedures	375
injections	43
lacrimal (tearing system) procedures	29
minimally invasive procedures	43
plastic surgery procedures	192
removal of lesion (e.g. growth)	15

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	158
Female	260

**Ethnicity**
Non-Hispanic White	404
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	192
From 75 to 84	136
85 and over	58
Less than 65	32

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2014

Hypertension	60
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	29
Depression	21
Chronic Kidney Disease	15
Asthma	7
Osteoperosis	6
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	9
Diabetes	24
Dementia	6
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2015 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	366
excision	21
eye procedures	388
injections	51
lacrimal (tearing system) procedures	32
minimally invasive procedures	51
plastic surgery procedures	217
removal of lesion (e.g. growth)	21

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	354
Female	468

**Ethnicity**
Non-Hispanic White	786
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	362
From 75 to 84	276
85 and over	104
Less than 65	80

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2015

Hypertension	63
High Cholesterol	58
Stroke	3
Ischemic Heart Disease	33
Depression	22
Chronic Kidney Disease	22
Asthma	8
Osteoperosis	5
Atrial Fibrilation	11
Heart Failure	14
Chronic Obstructive Pulmonary Disease	13
Diabetes	27
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2016 were eye procedures, plastic surgery procedures, lacrimal (tearing system) procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	359
excision	18
eye procedures	397
injections	39
lacrimal (tearing system) procedures	43
minimally invasive procedures	39
plastic surgery procedures	189
removal of lesion (e.g. growth)	18

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	147
Female	266

**Ethnicity**
Non-Hispanic White	393
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	227
From 75 to 84	116
85 and over	40
Less than 65	30

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2016

Hypertension	61
High Cholesterol	49
Stroke	3
Ischemic Heart Disease	26
Depression	17
Chronic Kidney Disease	22
Asthma	17
Osteoperosis	6
Atrial Fibrilation	11
Heart Failure	15
Chronic Obstructive Pulmonary Disease	11
Diabetes	26
Dementia	3
Cancer	8

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2017 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	321
excision	25
eye procedures	371
injections	60
lacrimal (tearing system) procedures	17
minimally invasive procedures	60
plastic surgery procedures	201
removal of lesion (e.g. growth)	25

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	141
Female	241

**Ethnicity**
Non-Hispanic White	366
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	157
From 75 to 84	149
85 and over	50
Less than 65	26

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2017

Hypertension	65
High Cholesterol	44
Stroke	3
Ischemic Heart Disease	28
Depression	19
Chronic Kidney Disease	29
Asthma	5
Osteoperosis	7
Atrial Fibrilation	9
Heart Failure	15
Chronic Obstructive Pulmonary Disease	8
Diabetes	30
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2018 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	375
excision	18
eye procedures	428
injections	62
lacrimal (tearing system) procedures	35
minimally invasive procedures	62
plastic surgery procedures	237
reconstructive surgery	19
removal of lesion (e.g. growth)	18
tissue transfer	19
wound repair (e.g. stitches)	19

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	146
Female	274

**Ethnicity**
Non-Hispanic White	396
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	204
From 75 to 84	150
85 and over	34
Less than 65	32

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2018

Hypertension	63
High Cholesterol	59
Stroke	3
Ischemic Heart Disease	28
Depression	25
Chronic Kidney Disease	28
Asthma	5
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	10
Diabetes	26
Dementia	7
Cancer	7

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2019 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	435
excision	22
eye procedures	499
injections	67
lacrimal (tearing system) procedures	43
minimally invasive procedures	67
plastic surgery procedures	281
reconstructive surgery	24
removal of lesion (e.g. growth)	22
tissue transfer	24
wound repair (e.g. stitches)	24

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	160
Female	305

**Ethnicity**
Non-Hispanic White	427
Black	0
Hispanic	0
Asian	0
Other	0
Native American	17

**Age**
From 65 to 74	248
From 75 to 84	140
85 and over	52
Less than 65	25

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2019

Hypertension	63
High Cholesterol	61
Stroke	3
Ischemic Heart Disease	31
Depression	26
Chronic Kidney Disease	25
Asthma	8
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	9
Diabetes	26
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2020 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	283
eye procedures	303
injections	55
lacrimal (tearing system) procedures	16
minimally invasive procedures	55
plastic surgery procedures	176

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	115
Female	212

**Ethnicity**
Non-Hispanic White	305
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	171
From 75 to 84	112
85 and over	32
Less than 65	12

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2020

Hypertension	64
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	28
Depression	23
Chronic Kidney Disease	27
Asthma	6
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	8
Diabetes	27
Dementia	4
Cancer	8

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2021 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	367
excision	20
eye procedures	407
injections	56
lacrimal (tearing system) procedures	30
minimally invasive procedures	56
plastic surgery procedures	199
removal of lesion (e.g. growth)	20

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	136
Female	260

**Ethnicity**
Non-Hispanic White	376
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	220
From 75 to 84	107
85 and over	45
Less than 65	24

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2021

Hypertension	62
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	32
Depression	22
Chronic Kidney Disease	29
Asthma	6
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	15
Chronic Obstructive Pulmonary Disease	8
Diabetes	24
Dementia	5
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI during 2022 were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

doctor visit	350
excision	16
eye procedures	306
injections	51
lacrimal (tearing system) procedures	30
minimally invasive procedures	51
plastic surgery procedures	115
removal of lesion (e.g. growth)	16

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	126
Female	244

**Ethnicity**
Non-Hispanic White	336
Black	0
Hispanic	0
Asian	0
Other	19
Native American	0

**Age**
From 65 to 74	203
From 75 to 84	117
85 and over	36
Less than 65	14

Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD in 2022

Hypertension	66
High Cholesterol	71
Stroke	4
Ischemic Heart Disease	19
Depression	22
Chronic Kidney Disease	19
Asthma	11
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	12
Chronic Obstructive Pulmonary Disease	12
Diabetes	20
Dementia	0
Cancer	12

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark T. Duffy, MD, PhD for Medicare patients.

The highest averages for the top procedures that Dr. Mark T. Duffy, MD, PhD treated as an oculoplastic surgeon in Bay, WI were eye procedures, plastic surgery procedures, minimally invasive procedures and injections.

doctor visit	383
excision	22
eye procedures	380
injections	53
lacrimal (tearing system) procedures	31
minimally invasive procedures	53
plastic surgery procedures	193
reconstructive surgery	21
removal of lesion (e.g. growth)	22
tissue transfer	21
wound repair (e.g. stitches)	21

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark T. Duffy, MD, PhD.

**Gender**
Male	150
Female	254

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	382
Hispanic	0
Native American / Alaskan Native	1
Other	2

**Age**
75 to 84	133
85 and over	45
Less than 65	28
65 to 74	197

Average of Total of Conditions of Medicare patients treated by Dr. Mark T. Duffy, MD, PhD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Mark T. Duffy, MD, PhD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	57
High Cholesterol	51
Stroke	2
Ischemic Heart Disease	25
Depression	19
Chronic Kidney Disease	21
Asthma	7
Osteoporosis	6
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	23
Atrial Fibrillation	9
Cancer	8
Dementia	4

Education & Training

Dr. Mark T. Duffy, MD, PhD graduated from University of Illinois College of Medicine at Chicago. He completed residency at University of Illinois at Chicago Affiliated Hospitals. He is certified by the American Board of Ophthalmology and has a state license in Wisconsin.

Medical School: University of Illinois College of Medicine at Chicago

Residency: University of Illinois at Chicago Affiliated Hospitals

Board Certification: American Board of Ophthalmology

Licensed In: Wisconsin

Affiliations & Hospitals

Dr. Mark T. Duffy, MD, PhD is associated with these hospitals and organizations:

Advocate Health Care

BayCare Clinic

BAYCARE CLINIC LLP

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General Payments

These charts describe general payments received by Dr. Mark T. Duffy, MD, PhD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Allergan Inc.	$617 BOTOX $531	RESTASIS $52	Botox Therapeutic $12	LUMIGAN $11	$12
Quest Medical Inc.	$311 LacriCATH $311
Novartis Pharmaceuticals Corporation	$217 Travatan Z $217
Galderma Laboratories, L.P.	$147 $147
Horizon Therapeutics plc	$125 TEPEZZA $125
Other	$301 Reconstruction $80	BOTOX $68	Medical Optics $52	XIIDRA $34	Rhopressa $20	Other $47

**Types of Payments**
Food and Beverage	$1,527
Education	$190

Biography

Dr. Mark Duffy's area of specialization is ophthalmic plastic surgery. Dr. Duffy's areas of expertise include the following: oculoplastic surgery, blepharoplasty, and cancer. His education and training includes medical school at the University of Illinois College of Medicine at Chicago and residency at a hospital affiliated with the University of Illinois at Chicago. His hospital/clinic affiliations include Aurora BayCare Medical Center and Advocate Health Care.