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Dr. Thomas Dag Horn, MBA, MD

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Specializes in: Clinical Pathology and Dermatopathology

University of Virginia School of Medicine

Professional interests include: skin issues, HIV/AIDS, graft versus host disease, and more.

2 Wells Avenue
Newton, MA 02459

1-855-644-3376

Dr. Thomas Dag Horn, MBA, MD is a clinical pathologist in Newton, MA specializing in clinical pathology and dermatopathology. He graduated from University of Virginia School of Medicine. Dr. Thomas Dag Horn, MBA, MD is affiliated with Newton-Wellesley Hospital, Massachusetts General Hospital and MASSACHUSETTS GENERAL PHYSICIANS ORGANIZATION INC.

Office Locations

Massachusetts General Hospital

2 Wells Avenue
Newton, MA 02459

1-855-644-3376

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Massachusetts General Hospital

50 Staniford Street
Boston, MA 02114

(617) 726-2914

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55 Fruit Street
Boston, MA 02114

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Some issues Dr. Thomas Dag Horn, MBA, MD can help you with:

Skin Issues

The skin is the largest organ in the body, protecting and covering the more sensitive inner organs. Considering its size and that it is constantly exposed to the elements, the skin is usually relatively problem-free. However that doesn't mean that issues don't come up from time to time that might need the help of a professional. The most common skin issues that people seek medical help with are cosmetic issues, acne, eczema, dermatitis, psoriasis, and skin growths.

Professional cosmetic skin treatments exist to treat wrinkles, scars, dark spots, remove excess hair, tone and tighten skin, and otherwise improve the appearance of the skin. They may use lasers, light therapy, chemical peels, microdermabrasion, or many other forms of skin treatment.

Acne occurs when hair follicles become clogged with oil and dead skin cells, most commonly on the face or back. The clogged follicles can then become infected and inflamed. Treatments include antibiotics, anti-inflammatories, and retinoid creams.

Eczema is dry, sensitive skin that causes an itchy red rash, often in response to specific triggers. It is common in childhood but can sometimes last into adulthood. The main treatment involves keeping skin well moisturized.

Dermatitis is the medical name for any kind of skin inflammation or rash. Rashes can happen because of an allergy or contact with an irritating substance. They may be red, itchy, or even painful. They are often treated with antihistamines or moisturizing creams containing cortisone.

Psoriasis is patches of thick, red skin that is covered in silvery scales. It is often itchy and sore. Psoriasis is thought to be caused by an immune disorder, and it runs in families. Psoriasis is not contagious. There is no cure, but there are medicated creams available to treat the symptoms.

Skin growths, including warts and moles, are usually not serious. However, some skin growths should be examined by a doctor to make sure they don't cause problems in the future. Warts are harmless, rough, bumpy growths caused by a viral infection. They occur most often on the hands and feet. Because they are caused by a virus, they are contagious. Moles are brown or black spots that are sometimes raised slightly from the surface of the skin. They happen when clumps of pigment cells form in a cluster instead of spread out. Moles are harmless except that they are more vulnerable to cancer than other parts of the skin. Skin cancer is the most common form of cancer in the United States, and its risk increases with sun exposure and fair skin tone.

Skin issues can be embarrassing or irritating, but most are minor and can be treated without serious problems. Some, however, can be a sign of a more significant issue, so it is important to see a doctor for anything out of the ordinary.

In The News

“Two of the authors, Dr. Thomas Horn and Dr. Sandra Johnson, have a significant ownership interest in a company formed to market a patented product based on the use of the antigens described in the...”—"Walking to keep cancer in check (Published 2005)", New York Times, June 2005

“The antigens - for mumps and two other viruses - spark the body's immune system to fight those viruses, said Dr. Thomas D. Horn, chair of dermatology at UAMS.”—"Smart Talk", Arkansas Times, June 2005

“Two of the authors, Dr. Thomas D. Horn and Dr. Sandra M. Johnson, have a significant ownership interest in a company formed to market a patented product based on the use of the antigens described...”—"Treatments: A Shot to Thwart Your Warts (Published 2005)", New York Times, May 2005

Noteworthy Medicare Patient Procedures Performed by Dr. Thomas Dag Horn, MBA, MD in 2023

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

Top 25%

By Affordability:

second opinions

slide consultation

In 2012, Dr. Thomas Dag Horn, MBA, MD had a list price for second opinions, and slide consultation that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Massachusetts. 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. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2012 were second opinions, diagnostic procedures, lab tests and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	52
doctor visit	218
lab tests	42
removal of lesion (e.g. growth)	22
second opinions	78
skin procedures	22

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2013 were lab tests, second opinions, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	32
doctor visit	154
lab tests	677
removal of lesion (e.g. growth)	30
second opinions	186
skin procedures	30

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	888
Female	959

**Ethnicity**
Non-Hispanic White	1777
Black	12
Hispanic	11
Asian	0
Other	36
Native American	0

**Age**
From 65 to 74	828
From 75 to 84	642
85 and over	269
Less than 65	108

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2013

Hypertension	58
High Cholesterol	51
Stroke	3
Ischemic Heart Disease	23
Depression	15
Chronic Kidney Disease	14
Asthma	5
Osteoperosis	7
Atrial Fibrilation	11
Heart Failure	10
Chronic Obstructive Pulmonary Disease	7
Diabetes	18
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2014 were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	30
doctor visit	163
lab tests	1047
removal of lesion (e.g. growth)	35
second opinions	147
skin procedures	35

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	1314
Female	1367

**Ethnicity**
Non-Hispanic White	2586
Black	16
Hispanic	0
Asian	0
Other	56
Native American	0

**Age**
From 65 to 74	1172
From 75 to 84	932
85 and over	440
Less than 65	137

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2014

Hypertension	57
High Cholesterol	50
Stroke	3
Ischemic Heart Disease	24
Depression	15
Chronic Kidney Disease	16
Asthma	5
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	10
Chronic Obstructive Pulmonary Disease	8
Diabetes	18
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2015 were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	37
doctor visit	155
lab tests	695
removal of lesion (e.g. growth)	37
second opinions	163
skin procedures	37

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	3264
Female	3542

**Ethnicity**
Non-Hispanic White	6454
Black	42
Hispanic	84
Asian	30
Other	196
Native American	0

**Age**
From 65 to 74	2930
From 75 to 84	2348
85 and over	1160
Less than 65	368

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2015

Hypertension	60
High Cholesterol	51
Stroke	3
Ischemic Heart Disease	25
Depression	17
Chronic Kidney Disease	17
Asthma	9
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	9
Diabetes	20
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2016 were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	27
doctor visit	154
lab tests	616
removal of lesion (e.g. growth)	31
second opinions	153
skin procedures	31

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	2099
Female	2274

**Ethnicity**
Non-Hispanic White	4144
Black	21
Hispanic	50
Asian	0
Other	139
Native American	0

**Age**
From 65 to 74	1930
From 75 to 84	1505
85 and over	691
Less than 65	247

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2016

Hypertension	59
High Cholesterol	49
Stroke	3
Ischemic Heart Disease	25
Depression	17
Chronic Kidney Disease	19
Asthma	13
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	11
Chronic Obstructive Pulmonary Disease	9
Diabetes	20
Dementia	7
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2017 were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	22
doctor visit	150
lab tests	567
removal of lesion (e.g. growth)	33
second opinions	169
skin procedures	33

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	2623
Female	2571

**Ethnicity**
Non-Hispanic White	4952
Black	0
Hispanic	52
Asian	20
Other	151
Native American	0

**Age**
From 65 to 74	2246
From 75 to 84	1832
85 and over	835
Less than 65	281

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2017

Hypertension	59
High Cholesterol	41
Stroke	3
Ischemic Heart Disease	25
Depression	16
Chronic Kidney Disease	20
Asthma	6
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	10
Chronic Obstructive Pulmonary Disease	9
Diabetes	19
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2018 were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

diagnostic procedures	17
doctor visit	84
lab tests	557
removal of lesion (e.g. growth)	34
second opinions	174
skin procedures	34

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	2202
Female	2100

**Ethnicity**
Non-Hispanic White	4067
Black	14
Hispanic	31
Asian	0
Other	176
Native American	0

**Age**
From 65 to 74	1895
From 75 to 84	1623
85 and over	621
Less than 65	163

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2018

Hypertension	60
High Cholesterol	54
Stroke	4
Ischemic Heart Disease	25
Depression	17
Chronic Kidney Disease	21
Asthma	6
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	10
Chronic Obstructive Pulmonary Disease	9
Diabetes	20
Dementia	8
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2019 were lab tests and second opinions.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

lab tests	605
second opinions	159

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	2153
Female	2108

**Ethnicity**
Non-Hispanic White	4039
Black	0
Hispanic	27
Asian	0
Other	169
Native American	0

**Age**
From 65 to 74	1827
From 75 to 84	1620
85 and over	683
Less than 65	131

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2019

Hypertension	60
High Cholesterol	55
Stroke	3
Ischemic Heart Disease	25
Depression	17
Chronic Kidney Disease	22
Asthma	6
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	10
Chronic Obstructive Pulmonary Disease	9
Diabetes	18
Dementia	7
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2020 were lab tests and second opinions.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

lab tests	219
second opinions	116

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	1538
Female	1507

**Ethnicity**
Non-Hispanic White	2865
Black	0
Hispanic	16
Asian	0
Other	145
Native American	0

**Age**
From 65 to 74	1384
From 75 to 84	1148
85 and over	423
Less than 65	90

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2020

Hypertension	58
High Cholesterol	53
Stroke	2
Ischemic Heart Disease	24
Depression	16
Chronic Kidney Disease	22
Asthma	5
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	10
Chronic Obstructive Pulmonary Disease	7
Diabetes	21
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2021 were lab tests and second opinions.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

lab tests	186
second opinions	73

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	1586
Female	1675

**Ethnicity**
Non-Hispanic White	3052
Black	16
Hispanic	17
Asian	0
Other	160
Native American	0

**Age**
From 65 to 74	1337
From 75 to 84	1315
85 and over	527
Less than 65	82

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2021

Hypertension	59
High Cholesterol	57
Stroke	3
Ischemic Heart Disease	24
Depression	16
Chronic Kidney Disease	23
Asthma	5
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	11
Chronic Obstructive Pulmonary Disease	8
Diabetes	20
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA during 2022 were lab tests and second opinions.

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

lab tests	155
second opinions	51

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	1354
Female	1345

**Ethnicity**
Non-Hispanic White	2524
Black	13
Hispanic	13
Asian	11
Other	138
Native American	0

**Age**
From 65 to 74	1090
From 75 to 84	1111
85 and over	435
Less than 65	63

Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD in 2022

Hypertension	69
High Cholesterol	74
Stroke	6
Ischemic Heart Disease	19
Depression	13
Chronic Kidney Disease	16
Asthma	8
Osteoperosis	13
Atrial Fibrilation	18
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	19
Dementia	3
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Thomas Dag Horn, MBA, MD for Medicare patients.

The highest averages for the top procedures that Dr. Thomas Dag Horn, MBA, MD treated as a clinical pathologist in Newton, MA were lab tests, second opinions, removal of lesion (e.g. growth) and skin procedures.

diagnostic procedures	31
doctor visit	154
lab tests	487
removal of lesion (e.g. growth)	31
second opinions	133
skin procedures	31

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD.

**Gender**
Male	1729
Female	1768

**Ethnicity**
Black / African American	12
Asian / Pacific Islander	5
Non-Hispanic White	3314
Native American / Alaskan Native	0
Hispanic	27
Other	124

**Age**
75 to 84	1279
85 and over	553
Less than 65	151
65 to 74	1512

Average of Total of Conditions of Medicare patients treated by Dr. Thomas Dag Horn, MBA, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Thomas Dag Horn, MBA, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	54
High Cholesterol	48
Stroke	3
Ischemic Heart Disease	21
Depression	14
Chronic Kidney Disease	17
Asthma	6
Osteoporosis	7
Heart Failure	9
Chronic Obstructive Pulmonary Disease	7
Diabetes	17
Atrial Fibrillation	11
Dementia	5
Cancer	11

Education & Training

Dr. Thomas Dag Horn, MBA, MD graduated from University of Virginia School of Medicine. He completed residency at University of Maryland Affiliated Hospitals. He is certified by the Dermatology, American Board of Dermatology and has a state license in Arkansas.

Medical School: University of Virginia School of Medicine

Residency: University of Maryland Affiliated Hospitals

Board Certification: Dermatology, American Board of Dermatology

Licensed In: Arkansas

Affiliations & Hospitals

Dr. Thomas Dag Horn, MBA, MD is associated with these hospitals and organizations:

Newton-Wellesley Hospital

Massachusetts General Hospital

MASSACHUSETTS GENERAL PHYSICIANS ORGANIZATION INC

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. Thomas Dag Horn, MBA, MD appears to accept the following insurance providers: Harvard Pilgrim Health Care, MultiPlan, Tufts Health Plan, United Healthcare, Aetna, TRICARE, Medicare, Medicaid, Humana, Railroad Medicare, Coventry, Cigna, Blue California, Beech Street, WellPoint, Medicare ACO, WellSense, Senior Whole Health, Fallon Health, Commonwealth Care Alliance, Blue Cross Blue Shield Medicare, Mass General Brigham Health Plan, Maine Community Health Options, MassHealth and WellSense NH.

Insurance Accepted by Provider includes:

According to our sources, Dr. Thomas Dag Horn, MBA, MD accepts the following insurance providers:

Harvard Pilgrim Health Care

MultiPlan

Tufts Health Plan

United Healthcare

Aetna

TRICARE

Medicare

Medicaid

Humana

Railroad Medicare

Coventry

Cigna

Blue California

Beech Street

WellPoint

Medicare ACO

WellSense

Senior Whole Health

Fallon Health

Commonwealth Care Alliance

Blue Cross Blue Shield Medicare

Mass General Brigham Health Plan

Maine Community Health Options

MassHealth

WellSense NH

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General Payments

These charts describe general payments received by Dr. Thomas Dag Horn, MBA, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
LEO Pharma Inc.	$11 ENSTILAR $11

**Types of Payments**
Food and Beverage	$11

Biography

Dr. Thomas Horn sees patients in Boston, MA and Newton, MA. His medical specialties are clinical pathology and dermatopathology. He has a special interest in warts, graft versus host disease, and HIV/AIDS. His hospital/clinic affiliations include Massachusetts General Hospital and Newton-Wellesley Hospital. Dr. Horn accepts Blue California, Coventry, and Viant, in addition to other insurance carriers. According to Newton-Wellesley Hospital, he is not acceping new patients at this time. After attending the University of Virginia School of Medicine, he completed his residency training at a hospital affiliated with the University of Maryland. Dr. Horn speaks German.