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Dr. Gregory L. Cowan, MD

Accepting New Patients

(Dr. Gregory Cowan, MD)

(150 Ratings)

Specializes in: Glaucoma and Surgery

George Washington University School of Medicine and Health Sciences (1988)

Professional interests include: chalazion (meibomian cyst), cataracts, dry eye syndrome, and more.

4277 Hempstead Turnpike
Bethpage, NY 11714

(516) 796-4030

Dr. Gregory L. Cowan, MD is an ophthalmologist in Bethpage, NY specializing in glaucoma and surgery. He graduated from George Washington University School of Medicine and Health Sciences in 1988 and has 38 years of experience. Dr. Gregory L. Cowan, MD is affiliated with SightMD and SIGHT MEDICAL DOCTORS PLLC.

Office Locations

4277 Hempstead Turnpike
Bethpage, NY 11714

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4277 Hempstead Turnpike Suite 109 Bethpage Ny
Oyster Bay, NY 11714

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory L. Cowan, MD in 2024

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

Top 5%

By Volume:

punctal plug insertion

In 2024, Dr. Gregory L. Cowan, MD performed more punctal plug insertion procedures for Medicare patients than 95% of providers in related specialties within New York.

Top 25%

By Volume:

laser trabeculoplasty

ultrasound corneal pachymetry

By Affordability:

eye tests

visual field test

In 2012, among providers in related specialties within New York, Dr. Gregory L. Cowan, MD performed more eye procedures, laser eye surgery, laser iridectomy, laser iridotomy, laser trabeculoplasty, and ultrasound corneal pachymetry procedures for Medicare patients than 75% of them and he also had a list price for eye tests, and visual field test 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. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2012 were eye procedures, lacrimal (tearing system) procedures, ultrasound (sonogram) and diagnostic imaging.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

diagnostic imaging	93
excision	19
eye procedures	4926
lacrimal (tearing system) procedures	212
laser treatment	19
ultrasound (sonogram)	161

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2013 were eye procedures, ultrasound (sonogram), lacrimal (tearing system) procedures and diagnostic imaging.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	21
diagnostic imaging	247
eye procedures	6008
foreign body removal	17
lacrimal (tearing system) procedures	251
laser treatment	21
ultrasound (sonogram)	292

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	296
Female	409

**Ethnicity**
Non-Hispanic White	651
Black	21
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	277
From 75 to 84	264
85 and over	124
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2013

Hypertension	72
High Cholesterol	72
Stroke	4
Ischemic Heart Disease	47
Depression	9
Chronic Kidney Disease	15
Asthma	8
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	21
Chronic Obstructive Pulmonary Disease	12
Diabetes	44
Dementia	9
Cancer	14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2014 were eye procedures, lacrimal (tearing system) procedures, ultrasound (sonogram) and diagnostic imaging.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	24
diagnostic imaging	74
eye procedures	5973
foreign body removal	23
lacrimal (tearing system) procedures	342
laser treatment	24
ultrasound (sonogram)	91

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	283
Female	382

**Ethnicity**
Non-Hispanic White	612
Black	23
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	276
From 75 to 84	225
85 and over	119
Less than 65	45

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2014

Hypertension	72
High Cholesterol	71
Stroke	4
Ischemic Heart Disease	47
Depression	12
Chronic Kidney Disease	13
Asthma	8
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	11
Diabetes	43
Dementia	9
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2015 were eye procedures, lacrimal (tearing system) procedures, ultrasound (sonogram) and lab tests.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

diagnostic imaging	49
eye procedures	5059
foreign body removal	18
lab tests	120
lacrimal (tearing system) procedures	284
ultrasound (sonogram)	164

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	562
Female	788

**Ethnicity**
Non-Hispanic White	1226
Black	46
Hispanic	30
Asian	0
Other	26
Native American	0

**Age**
From 65 to 74	580
From 75 to 84	444
85 and over	244
Less than 65	82

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2015

Hypertension	70
High Cholesterol	73
Stroke	4
Ischemic Heart Disease	43
Depression	14
Chronic Kidney Disease	15
Asthma	10
Osteoperosis	13
Atrial Fibrilation	12
Heart Failure	18
Chronic Obstructive Pulmonary Disease	11
Diabetes	42
Dementia	8
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2016 were eye procedures, lab tests, ultrasound (sonogram) and lacrimal (tearing system) procedures.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	32
diagnostic imaging	33
doctor visit	19
eye procedures	5175
foreign body removal	14
lab tests	736
lacrimal (tearing system) procedures	182
laser treatment	32
ultrasound (sonogram)	343

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	312
Female	419

**Ethnicity**
Non-Hispanic White	655
Black	25
Hispanic	24
Asian	14
Other	13
Native American	0

**Age**
From 65 to 74	321
From 75 to 84	235
85 and over	135
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2016

Hypertension	70
High Cholesterol	70
Stroke	4
Ischemic Heart Disease	43
Depression	13
Chronic Kidney Disease	21
Asthma	14
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	19
Chronic Obstructive Pulmonary Disease	11
Diabetes	42
Dementia	8
Cancer	14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2017 were eye procedures, lab tests, ultrasound (sonogram) and lacrimal (tearing system) procedures.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	21
diagnostic imaging	156
doctor visit	17
excision	14
eye procedures	5679
foreign body removal	27
lab tests	917
lacrimal (tearing system) procedures	426
laser treatment	21
removal of lesion (e.g. growth)	14
ultrasound (sonogram)	500

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	335
Female	468

**Ethnicity**
Non-Hispanic White	729
Black	23
Hispanic	19
Asian	17
Other	15
Native American	0

**Age**
From 65 to 74	357
From 75 to 84	272
85 and over	127
Less than 65	47

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2017

Hypertension	68
High Cholesterol	61
Stroke	5
Ischemic Heart Disease	39
Depression	13
Chronic Kidney Disease	24
Asthma	7
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	11
Diabetes	44
Dementia	8
Cancer	14

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2018 were eye procedures, lab tests, lacrimal (tearing system) procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	12
diagnostic imaging	43
eye procedures	4928
foreign body removal	28
lab tests	526
lacrimal (tearing system) procedures	204
laser treatment	32
ultrasound (sonogram)	166

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	321
Female	456

**Ethnicity**
Non-Hispanic White	697
Black	23
Hispanic	21
Asian	17
Other	19
Native American	0

**Age**
From 65 to 74	333
From 75 to 84	272
85 and over	131
Less than 65	41

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2018

Hypertension	69
High Cholesterol	71
Stroke	5
Ischemic Heart Disease	40
Depression	13
Chronic Kidney Disease	24
Asthma	7
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	16
Chronic Obstructive Pulmonary Disease	13
Diabetes	43
Dementia	7
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2019 were eye procedures, lab tests, lacrimal (tearing system) procedures and laser treatment.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	16
doctor visit	147
eye procedures	3972
lab tests	228
lacrimal (tearing system) procedures	86
laser treatment	80
ultrasound (sonogram)	64

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	321
Female	427

**Ethnicity**
Non-Hispanic White	667
Black	24
Hispanic	14
Asian	18
Other	25
Native American	0

**Age**
From 65 to 74	332
From 75 to 84	240
85 and over	125
Less than 65	51

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2019

Hypertension	69
High Cholesterol	70
Stroke	5
Ischemic Heart Disease	38
Depression	15
Chronic Kidney Disease	28
Asthma	7
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	13
Diabetes	41
Dementia	7
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2020 were eye procedures, lacrimal (tearing system) procedures, laser treatment and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

doctor visit	36
eye procedures	3350
lab tests	31
lacrimal (tearing system) procedures	43
laser treatment	36
ultrasound (sonogram)	32

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	262
Female	360

**Ethnicity**
Non-Hispanic White	548
Black	19
Hispanic	14
Asian	20
Other	21
Native American	0

**Age**
From 65 to 74	296
From 75 to 84	186
85 and over	95
Less than 65	45

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2020

Hypertension	64
High Cholesterol	67
Stroke	4
Ischemic Heart Disease	36
Depression	15
Chronic Kidney Disease	26
Asthma	7
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	14
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. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2021 were eye procedures, lab tests, ultrasound (sonogram) and lacrimal (tearing system) procedures.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

doctor visit	547
eye procedures	3263
foreign body removal	20
lab tests	73
lacrimal (tearing system) procedures	41
laser treatment	22
ultrasound (sonogram)	69

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	317
Female	443

**Ethnicity**
Non-Hispanic White	666
Black	23
Hispanic	20
Asian	22
Other	29
Native American	0

**Age**
From 65 to 74	360
From 75 to 84	253
85 and over	101
Less than 65	46

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2021

Hypertension	68
High Cholesterol	69
Stroke	4
Ischemic Heart Disease	39
Depression	15
Chronic Kidney Disease	25
Asthma	8
Osteoperosis	13
Atrial Fibrilation	11
Heart Failure	14
Chronic Obstructive Pulmonary Disease	9
Diabetes	38
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2022 were eye procedures, laser treatment, ultrasound (sonogram) and lab tests.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

capsulotomy	15
doctor visit	691
eye procedures	2942
foreign body removal	21
lab tests	34
lacrimal (tearing system) procedures	22
laser treatment	57
ultrasound (sonogram)	55

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	325
Female	468

**Ethnicity**
Non-Hispanic White	705
Black	20
Hispanic	19
Asian	20
Other	29
Native American	0

**Age**
From 65 to 74	363
From 75 to 84	269
85 and over	117
Less than 65	44

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2022

Hypertension	74
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	32
Depression	13
Chronic Kidney Disease	15
Asthma	12
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	10
Chronic Obstructive Pulmonary Disease	13
Diabetes	38
Dementia	5
Cancer	19

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2023 were eye procedures, ultrasound (sonogram), laser treatment and lacrimal (tearing system) procedures.

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

doctor visit	1031
eye procedures	2454
lab tests	24
lacrimal (tearing system) procedures	49
laser treatment	51
ultrasound (sonogram)	68

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	320
Female	432

**Ethnicity**
Non-Hispanic White	652
Black	23
Hispanic	23
Asian	23
Other	31
Native American	0

**Age**
From 65 to 74	338
From 75 to 84	259
85 and over	105
Less than 65	50

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2023

Hypertension	74
High Cholesterol	75
Stroke	9
Ischemic Heart Disease	32
Depression	11
Chronic Kidney Disease	17
Asthma	12
Osteoperosis	18
Atrial Fibrilation	16
Heart Failure	11
Chronic Obstructive Pulmonary Disease	15
Diabetes	39
Dementia	4
Cancer	18

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY during 2024 were eye procedures, lacrimal (tearing system) procedures, laser treatment and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

doctor visit	963
excision	39
eye procedures	2558
lacrimal (tearing system) procedures	133
laser treatment	90
ultrasound (sonogram)	60

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	312
Female	438

**Ethnicity**
Non-Hispanic White	651
Black	25
Hispanic	26
Asian	22
Other	26
Native American	0

**Age**
From 65 to 74	337
From 75 to 84	270
85 and over	103
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	33
Depression	13
Chronic Kidney Disease	17
Asthma	12
Osteoperosis	19
Atrial Fibrilation	17
Heart Failure	11
Chronic Obstructive Pulmonary Disease	14
Diabetes	39
Dementia	4
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Gregory L. Cowan, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory L. Cowan, MD treated as an ophthalmologist in Bethpage, NY were eye procedures, lab tests, lacrimal (tearing system) procedures and ultrasound (sonogram).

capsulotomy	20
diagnostic imaging	99
doctor visit	431
excision	24
eye procedures	4329
foreign body removal	21
lab tests	298
lacrimal (tearing system) procedures	175
laser treatment	40
removal of lesion (e.g. growth)	14
ultrasound (sonogram)	158

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Gregory L. Cowan, MD.

**Gender**
Male	305
Female	422

**Ethnicity**
Black / African American	22
Asian / Pacific Islander	13
Non-Hispanic White	650
Hispanic	18
Native American / Alaskan Native	0
Other	18

**Age**
75 to 84	245
85 and over	117
Less than 65	43
65 to 74	320

Average of Total of Conditions of Medicare patients treated by Dr. Gregory L. Cowan, MD From 2012 - 2024

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

Hypertension	65
High Cholesterol	65
Stroke	5
Ischemic Heart Disease	36
Depression	12
Chronic Kidney Disease	18
Asthma	8
Osteoporosis	11
Heart Failure	14
Chronic Obstructive Pulmonary Disease	11
Diabetes	37
Atrial Fibrillation	12
Cancer	13
Dementia	6

Education & Training

Dr. Gregory L. Cowan, MD graduated from George Washington University School of Medicine and Health Sciences in 1988. He completed residency at Mount Sinai Medical Center. He is certified by the American Board of Ophthalmology and has a state license in New York.

Medical School: George Washington University School of Medicine and Health Sciences (1988)

Residency: Mount Sinai Medical Center

Board Certification: American Board of Ophthalmology (1993)

Licensed In: New York

Ratings & Reviews

Dr. Gregory L. Cowan, MD has an exceptional overall rating with an average of 4.97 out of 5 stars based on 150 ratings. We collect ratings and reviews of Dr. Gregory L. Cowan, MD from all over the web to help you find the right in Bethpage, NY.

4.97

Overall Rating

(150 Ratings)

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General Payments

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

**Payments by Company**
Allergan Inc.	$1,187 RESTASIS $517	COMBIGAN $399	LUMIGAN $228	NATRELLE IMPLANTS $4	$39
Alcon Vision LLC	$808 Simbrinza $389	TRYPTYR $182	Rocklatan $159	Rhopressa $32	EYSUVIS $31	Other $16
Oyster Point Pharma, Inc.	$481 TYRVAYA $481
AbbVie Inc.	$457 LUMIGAN $268	VUITY $76	ALPHAGAN P $60	DURYSTA $54
Tarsus Pharmaceuticals, Inc.	$431 XDEMVY $431
Other	$2,937 XIIDRA $299	VYZULTA $219	Rocklatan $191	VEVYE $186	SYFOVRE $151	Other $1,890

**Types of Payments**
Food and Beverage	$6,257
Gift	$45

Biography

Dr. Gregory Cowan is a glaucoma and surgery specialist. Areas of expertise for Dr. Cowan include conjunctivitis (pink eye), macular degeneration, and chalazion (meibomian cyst). Dr. Cowan is professionally affiliated with SightMD. He completed his residency training at Mount Sinai Medical Center. Dr. Cowan is rated highly by his patients. SightMD reports that he is accepting new patients at his office in Bethpage, NY.