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Dr. Kathryn A. Colby, MD, PhD

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Specializes in: Eye Disease Ophthalmology (Corneal and External Diseases)

Professional interests include: ulcers, squamous cell carcinoma, corneal surgery, and more.

222 East 41st Street 4th Floor
New York, NY 10017

(212) 263-2573

Dr. Kathryn A. Colby, MD, PhD is a cornea specialist in New York, NY specializing in eye disease ophthalmology (corneal and external diseases). Dr. Kathryn A. Colby, MD, PhD is affiliated with NYU Langone Health.

Office Locations

NYU Langone Health

222 East 41st Street 4th Floor
New York, NY 10017

(212) 263-2573

(212) 263-2574

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In The News (see more mentions in the news)

“In an accompanying commentary, Kathryn A. Colby, MD, PhD, and Andrea L. Blitzer, MD, of the NYU Grossman School of Medicine in New York City, noted that "while graft preparation failure rates...”—"Diabetic Donor Corneas Show Success in Transplants for Endothelial Dysfunction", MedPage Today, October 2025

“Dr. Kathryn A. Colby, the Elisabeth J. Cohen, M.D., professor of ophthalmology and chair of the department at the NYU Grossman School of Medicine, offers insight on when you need more advanced eye...”—"Ophthalmologists provide complex eye care: When to see one and what to expect", New York Post, April 2024

“"In an emergency, any clean liquid can be used to irrigate the eye following chemical exposure," Dr. Kathryn Colby, chairwoman of the department of ophthalmology at the N.Y.U. Grossman School of...”—"Children Are Consuming Hand Sanitizer. Here's How to Keep Them Safe.", New York Times, February 2021

Noteworthy Medicare Patient Procedures Performed by Dr. Kathryn A. Colby, MD, PhD in 2023

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

Top 25%

By Affordability:

eye tests

In 2012, Dr. Kathryn A. Colby, MD, PhD had a list price for eye tests that was lower than the list prices billed to Medicare by 75% of providers in related specialties within New York. 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. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2012 were eye procedures, ultrasound (sonogram) and diagnostic procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

diagnostic procedures	50
doctor visit	669
eye procedures	291
ultrasound (sonogram)	126

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2013 were eye procedures, ultrasound (sonogram), diagnostic procedures and transplant procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

ablation	13
diagnostic procedures	37
doctor visit	670
eye procedures	409
removal of lesion (e.g. growth)	13
transplant procedures	18
ultrasound (sonogram)	229

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	157
Female	225

**Ethnicity**
Non-Hispanic White	350
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	145
From 75 to 84	142
85 and over	67
Less than 65	28

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2013

Hypertension	61
High Cholesterol	51
Stroke	3
Ischemic Heart Disease	29
Depression	17
Chronic Kidney Disease	17
Asthma	9
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	8
Diabetes	20
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2014 were eye procedures, ultrasound (sonogram), diagnostic procedures and transplant procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

ablation	11
debridement (removal of unhealthy tissue)	11
diagnostic procedures	42
doctor visit	633
eye procedures	421
removal of lesion (e.g. growth)	11
transplant procedures	24
ultrasound (sonogram)	242

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	155
Female	221

**Ethnicity**
Non-Hispanic White	347
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	150
From 75 to 84	131
85 and over	64
Less than 65	31

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2014

Hypertension	59
High Cholesterol	49
Stroke	3
Ischemic Heart Disease	28
Depression	18
Chronic Kidney Disease	18
Asthma	9
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	20
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2015 were eye procedures, ultrasound (sonogram) and diagnostic procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

diagnostic procedures	27
doctor visit	242
eye procedures	152
ultrasound (sonogram)	88

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	170
Female	258

**Ethnicity**
Non-Hispanic White	392
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	192
From 75 to 84	138
85 and over	70
Less than 65	28

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2015

Hypertension	53
High Cholesterol	46
Stroke	0
Ischemic Heart Disease	22
Depression	19
Chronic Kidney Disease	17
Asthma	9
Osteoperosis	11
Atrial Fibrilation	10
Heart Failure	12
Chronic Obstructive Pulmonary Disease	7
Diabetes	17
Dementia	7
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2017 were ultrasound (sonogram) and eye procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	45
eye procedures	38
ultrasound (sonogram)	38

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2017

Hypertension	39
High Cholesterol	0
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2018 were ultrasound (sonogram) and eye procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	49
eye procedures	41
ultrasound (sonogram)	41

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	11
Female	25

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2018

Hypertension	39
High Cholesterol	36
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2019 were ultrasound (sonogram) and eye procedures.

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	38
eye procedures	34
ultrasound (sonogram)	34

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	14
Female	17

**Age**
From 65 to 74	20
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2019

Hypertension	39
High Cholesterol	55
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2021 were eye procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	64
eye procedures	60
ultrasound (sonogram)	32

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	16
Female	22

**Age**
From 65 to 74	21
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2021

Hypertension	39
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	37
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2022 were eye procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	77
eye procedures	73
ultrasound (sonogram)	43

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	22
Female	27

**Age**
From 65 to 74	28
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2022

Hypertension	51
High Cholesterol	69
Stroke	0
Ischemic Heart Disease	22
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	24
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY during 2023 were eye procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

doctor visit	42
eye procedures	59
ultrasound (sonogram)	39

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	14
Female	24

**Age**
From 65 to 74	0
From 75 to 84	18
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD in 2023

Hypertension	58
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	29
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Kathryn A. Colby, MD, PhD for Medicare patients.

The highest averages for the top procedures that Dr. Kathryn A. Colby, MD, PhD treated as a cornea specialist in New York, NY were eye procedures, ultrasound (sonogram), diagnostic procedures and transplant procedures.

ablation	12
debridement (removal of unhealthy tissue)	11
diagnostic procedures	39
doctor visit	252
eye procedures	157
removal of lesion (e.g. growth)	12
transplant procedures	21
ultrasound (sonogram)	91

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD.

**Gender**
Male	55
Female	81

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	108
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	42
85 and over	20
Less than 65	8
65 to 74	55

Average of Total of Conditions of Medicare patients treated by Dr. Kathryn A. Colby, MD, PhD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Kathryn A. Colby, MD, PhD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	43
High Cholesterol	42
Stroke	0
Ischemic Heart Disease	16
Depression	5
Chronic Kidney Disease	5
Asthma	2
Osteoporosis	5
Heart Failure	3
Chronic Obstructive Pulmonary Disease	2
Diabetes	5
Atrial Fibrillation	3
Cancer	3
Dementia	2

Education & Training

She completed residency at Massachusetts Eye and Ear Infirmary. She is certified by the American Board of Ophthalmology - Ophthalmology and has a state license in Massachusetts.

Residency: Massachusetts Eye and Ear Infirmary (1996)

Board Certification: American Board of Ophthalmology - Ophthalmology (1997)

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. Kathryn A. Colby, MD, PhD is associated with these hospitals and organizations:

NYU Langone Health

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Kathryn A. Colby, MD, PhD appears to accept the following insurance providers: MultiPlan, BlueCross BlueShield of Florida, GHI Medicare Supplement, CIGNA Open Access, United Healthcare PPO, United Healthcare POS, United Healthcare Indemnity, United Healthcare HMO, United Healthcare EPO, United Healthcare Choice, First Health PPO, Aetna POS, Aetna Open Access HMO, Great-West Healthcare HMO, Aetna Indemnity, Golden Rule, Great-West Healthcare, TRICARE, Community Care Network (CCN), Anthem, Trustmark , Aetna PPO, Beech Street PPO, Aetna HMO, Kaiser Permanente, Blue Cross Blue Shield Medicare HMO, Aetna Open Access EPO, Group Health Incorporated (GHI), CIGNA PPO, CIGNA HMO, EmblemHealth, CIGNA Indemnity, United Healthcare Medicare, AARP, Medicare Part B, Medicare Advantage, TriWest, Blue Cross Blue Shield HMO, Blue Cross Blue Shield POS, Blue Cross Blue Shield EPO, Local 1199 PPO, Blue Cross Blue Shield Indemnity, HealthSpring, US Family Health Plan, UnitedHealthcare, Blue Cross Blue Shield PPO, United Healthcare, United Healthcare Navigate, GEHA, Guardian, Railroad Medicare, Humana, Cigna, 1199SEIU, MagnaCare PPO, Aetna Medicare, MultiPlan PPO, Private Healthcare Systems (PHCS), Apwu Health Plan, IUOE Local 14-14B, American Plan Administrators, Teamsters Allied Benefits, Nippon Life-Aetna, Insurance Design Administrators, Aetna POS (American Express Employer), Mutual of Omaha, Christian Brothers Services, Aetna EPO (American Express employer), Administrative Concepts, BCBS PPO (BlackRock Employees), WellNet, Oxford Health Plans Liberty, Qualcare Inc, BCBS PPO (NYU Langone Suffolk Employees), Global Excel, BCBS Blue Access EPO Large Group, NYS Health Insurance Plan - The Empire Plan, Excelsior Plan, NY Student Employee Health Plan, Aetna Medicare Value Select HMO, AXA Assistance USA, BCBS Mediblue Medicare PPO, World Trade Center - Sedgwick, UMR, Surest, UMR GEHA, Wellfleet-NYU Student, MVP Preferred EPO, Starmark, Screen Actors Guild, BCBS Blue Access EPO Small Group, Allied, BCBS Federal Program, AETNA EPO (NYULH Employees), Aetna Student Plan, BCBS EPO (BlackRock Employees), Oxford Health Plans Freedom, US Life Insurance Company, Meritain Health, Hotel Trades Council, WTC Health Program, Nippon Life Ins Co, BCBS Blue Access GEPO Small Group, Fiserv Health, BCBS Mediblue Select HMO/Extra HMO, Chesterfield Resources Inc, BCBS PPO/EPO Small Group, BCBS EPO (NYU Langone Suffolk Employees), BCBS Local 32BJ Employees, NY Fire Department - WTC, Aetna International, BCBS Out of State or Region, Professional Benefit Admin, Aetna Signature Administrators PPO, Qualcare Direct, Nippon Life of America-Aetna, Health Net of California, Aetna Choice POS II Value Plan (NY University Employees), AETNA EPO (Sunset Park Employees), Wlny-TV Inc., New York Hotel Trades, BCBS Blue Access PPO Large Group, Aetna Meritain Health, Aetna Choice POS II Choice Plus Plan (NY University Employees), Health Republic of New Jersey, Medicare Part A and B, Diversified Administration Corporation, Global Health, NYC Employees PPO Plan and HIP Medicare Supplement.

Insurance Accepted by Provider includes:

According to our sources, Dr. Kathryn A. Colby, MD, PhD accepts the following insurance providers:

MultiPlan

BlueCross BlueShield of Florida

GHI Medicare Supplement

CIGNA Open Access

United Healthcare PPO

United Healthcare POS

United Healthcare Indemnity

United Healthcare HMO

United Healthcare EPO

United Healthcare Choice

First Health PPO

Aetna POS

Aetna Open Access HMO

Great-West Healthcare HMO

Aetna Indemnity

Golden Rule

Great-West Healthcare

TRICARE

Community Care Network (CCN)

Anthem

Trustmark

Aetna PPO

Beech Street PPO

Aetna HMO

Kaiser Permanente

Blue Cross Blue Shield Medicare HMO

Aetna Open Access EPO

Group Health Incorporated (GHI)

CIGNA PPO

CIGNA HMO

EmblemHealth

CIGNA Indemnity

United Healthcare Medicare

AARP

Medicare Part B

Medicare Advantage

TriWest

Blue Cross Blue Shield HMO

Blue Cross Blue Shield POS

Blue Cross Blue Shield EPO

Local 1199 PPO

Blue Cross Blue Shield Indemnity

HealthSpring

US Family Health Plan

UnitedHealthcare

Blue Cross Blue Shield PPO

United Healthcare

United Healthcare Navigate

GEHA

Guardian

Railroad Medicare

Humana

Cigna

1199SEIU

MagnaCare PPO

Aetna Medicare

MultiPlan PPO

Private Healthcare Systems (PHCS)

Apwu Health Plan

IUOE Local 14-14B

American Plan Administrators

Teamsters Allied Benefits

Nippon Life-Aetna

Insurance Design Administrators

Aetna POS (American Express Employer)

Mutual of Omaha

Christian Brothers Services

Aetna EPO (American Express employer)

Administrative Concepts

BCBS PPO (BlackRock Employees)

WellNet

Oxford Health Plans Liberty

Qualcare Inc

BCBS PPO (NYU Langone Suffolk Employees)

Global Excel

BCBS Blue Access EPO Large Group

NYS Health Insurance Plan - The Empire Plan, Excelsior Plan, NY Student Employee Health Plan

Aetna Medicare Value Select HMO

AXA Assistance USA

BCBS Mediblue Medicare PPO

World Trade Center - Sedgwick

UMR

Surest

UMR GEHA

Wellfleet-NYU Student

MVP Preferred EPO

Starmark

Screen Actors Guild

BCBS Blue Access EPO Small Group

Allied

BCBS Federal Program

AETNA EPO (NYULH Employees)

Aetna Student Plan

BCBS EPO (BlackRock Employees)

Oxford Health Plans Freedom

US Life Insurance Company

Meritain Health

Hotel Trades Council

WTC Health Program

Nippon Life Ins Co

BCBS Blue Access GEPO Small Group

Fiserv Health

BCBS Mediblue Select HMO/Extra HMO

Chesterfield Resources Inc

BCBS PPO/EPO Small Group

BCBS EPO (NYU Langone Suffolk Employees)

BCBS Local 32BJ Employees

NY Fire Department - WTC

Aetna International

BCBS Out of State or Region

Professional Benefit Admin

Aetna Signature Administrators PPO

Qualcare Direct

Nippon Life of America-Aetna

Health Net of California

Aetna Choice POS II Value Plan (NY University Employees)

AETNA EPO (Sunset Park Employees)

Wlny-TV Inc.

New York Hotel Trades

BCBS Blue Access PPO Large Group

Aetna Meritain Health

Aetna Choice POS II Choice Plus Plan (NY University Employees)

Health Republic of New Jersey

Medicare Part A and B

Diversified Administration Corporation

Global Health

NYC Employees PPO Plan

HIP Medicare Supplement

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General Payments

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

**Payments by Company**
GlaxoSmithKline, LLC.	$83,848 $83,848
W. L. Gore & Associates, Inc.	$34,486 Product in Development $34,486
Amgen Inc.	$11,815 $11,815
E.R. Squibb & Sons, L.L.C.	$4,400 $4,400
Merck Sharp & Dohme Corporation	$4,270 NON-PRODUCT $4,270
Other	$1,097 Healon Viscoelastics $125	AcrySof $116	OMNI(R) SURGICAL SYSTEM (US) $115	CLAREON $112	AcrySof IQ PanOptix UV IOL $104	Other $525

**Types of Payments**
Consulting Fee	$136,682
Travel and Lodging	$1,863
Food and Beverage	$1,371

Biography

Dr. Kathryn Colby is a medical specialist in eye disease ophthalmology (corneal and external diseases). Her areas of expertise include herpes, ulcers, and shingles. Dr. Colby is professionally affiliated with NYU Langone Health. Her medical residency was performed at Massachusetts Eye and Ear Infirmary. She appears to be in-network for Trustmark, Anthem, and Blue California, in addition to other insurance carriers.