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Dr. Nelson T. Chao, MD

Accepting New Patients

(Dr. Nelson Tan Chao, M.D.)

(4 Ratings)

Specializes in: Adult Pulmonology and Adult Allergy & Immunology

Far Eastern University, Nicanor Reyes Medical Foundation

Professional interests include: angioedema, immunization (preventive vaccines), insect allergy, and more.

4 Corporate Drive Suite 268
Shelton, CT 06484

(203) 402-0377

Dr. Nelson T. Chao, MD is a pulmonologist in Shelton, CT specializing in adult pulmonology and adult allergy & immunology. He graduated from Far Eastern University, Nicanor Reyes Medical Foundation. Dr. Nelson T. Chao, MD is affiliated with Yale New Haven Health.

Office Locations

Yale New Haven Health

4 Corporate Drive Suite 268
Shelton, CT 06484

(203) 402-0772

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Some issues Dr. Nelson T. Chao, MD can help you with:

Lung Issues

Every cell in the body requires oxygen to function and produces carbon dioxide as a waste product. In order to keep the body's tissues constantly supplied with fresh oxygen and to keep waste from building up, the lungs pump air in and out, even while sleeping or unaware. Unfortunately, diseases and disorders affecting the lungs are some of the most common medical problems afflicting people around the world. Some of the most common lung problems include asthma, COPD, pneumonia, and lung cancer.

Asthma is a chronic disease where swollen, inflamed airways make it hard to breathe. It is often brought on by specific triggers. While asthma is a common condition, affecting millions of people, it can also be serious and even fatal in severe cases. Treatment involves avoiding triggers and using inhaled corticosteroid medications.

COPD, or Chronic Obstructive Pulmonary Disease, is the name given to two illnesses that both cause difficulty breathing: emphysema and chronic bronchitis. In emphysema, the air sacs of the lungs become damaged, while with bronchitis they become clogged with mucus. COPD is the fourth leading cause of death in the United States. It is almost always caused by breathing irritants into the lungs, such as smoking or heavy pollution.

Pneumonia is a lung infection that can be caused by bacteria, a virus, or fungi. Most healthy people recover from pneumonia in a week or two, but for some people pneumonia can be fatal. There are treatments available for pneumonia, but the best treatment is to prevent getting sick in the first place. People who are at risk should make sure they get a flu shot every year. There is also a vaccine available for the type of bacteria that causes pneumonia.

Lung cancer occurs when abnormal cells inside the lung grow into a tumor, destroying healthy tissue. Because it is so difficult to detect lung cancer in early stages when it has few symptoms, it is the deadliest form of cancer, responsible for the most cancer deaths both in the U.S. and worldwide. Most lung cancer is caused by exposure to tobacco smoke, but between 10-15% of cases are not linked to smoking.

Some problems with the lungs are minor and are not cause for concern. However if symptoms have lasted for a month or more, even if they are minor, it is worth checking with a healthcare professional. A cough, shortness of breath, or excess mucus production that lingers for weeks are all worth getting looked at.

Noteworthy Medicare Patient Procedures Performed by Dr. Nelson T. Chao, MD in 2023

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

Top 5%

By Volume:

fecal occult blood test

preventive care

screening stool guaiac test

In 2023, Dr. Nelson T. Chao, MD performed more fecal occult blood test (FOBT), preventive care, and screening stool guaiac test (gFOBT) procedures for Medicare patients than 95% of providers in related specialties within Connecticut.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2012 were skin testing, minimally invasive procedures, allergy testing and hospital care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

allergy testing	621
doctor visit	506
hospital care	73
inpatient care	73
minimally invasive procedures	621
preventive care	62
skin testing	621
vaccines	62

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2013 were skin testing, minimally invasive procedures, allergy testing and hospital care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

allergy testing	623
doctor visit	522
hospital care	104
inpatient care	104
minimally invasive procedures	623
preventive care	67
skin testing	623
vaccines	67

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	85
Female	128

**Ethnicity**
Non-Hispanic White	188
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	106
From 75 to 84	72
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2013

Hypertension	61
High Cholesterol	54
Stroke	8
Ischemic Heart Disease	32
Depression	12
Chronic Kidney Disease	17
Asthma	24
Osteoperosis	10
Atrial Fibrilation	8
Heart Failure	19
Chronic Obstructive Pulmonary Disease	26
Diabetes	24
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2014 were skin testing, minimally invasive procedures, allergy testing and hospital care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

allergy testing	1002
doctor visit	563
hospital care	180
inpatient care	180
minimally invasive procedures	1002
preventive care	89
skin testing	1002
vaccines	89

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	90
Female	138

**Ethnicity**
Non-Hispanic White	195
Black	0
Hispanic	11
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	87
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2014

Hypertension	64
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	29
Depression	12
Chronic Kidney Disease	14
Asthma	23
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	30
Diabetes	24
Dementia	7
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2015 were preventive care, vaccines, hospital care and inpatient care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	540
hospital care	109
inpatient care	109
preventive care	110
vaccines	110

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	186
Female	274

**Ethnicity**
Non-Hispanic White	392
Black	0
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	210
From 75 to 84	164
85 and over	60
Less than 65	26

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2015

Hypertension	65
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	32
Depression	17
Chronic Kidney Disease	20
Asthma	27
Osteoperosis	8
Atrial Fibrilation	8
Heart Failure	17
Chronic Obstructive Pulmonary Disease	27
Diabetes	23
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2016 were preventive care and vaccines.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	556
preventive care	108
vaccines	108

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	100
Female	145

**Ethnicity**
Non-Hispanic White	206
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	122
From 75 to 84	80
85 and over	31
Less than 65	12

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2016

Hypertension	64
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	23
Depression	9
Chronic Kidney Disease	19
Asthma	35
Osteoperosis	7
Atrial Fibrilation	5
Heart Failure	11
Chronic Obstructive Pulmonary Disease	22
Diabetes	22
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2017 were skin testing, minimally invasive procedures, allergy testing and preventive care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

allergy testing	941
doctor visit	616
minimally invasive procedures	941
preventive care	70
skin testing	941
vaccines	70

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	112
Female	150

**Ethnicity**
Non-Hispanic White	222
Black	0
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	112
From 75 to 84	101
85 and over	36
Less than 65	13

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2017

Hypertension	63
High Cholesterol	39
Stroke	0
Ischemic Heart Disease	26
Depression	17
Chronic Kidney Disease	22
Asthma	21
Osteoperosis	11
Atrial Fibrilation	8
Heart Failure	12
Chronic Obstructive Pulmonary Disease	24
Diabetes	21
Dementia	8
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2018 were preventive care, vaccines and lab tests.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	567
lab tests	65
preventive care	190
vaccines	125

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	102
Female	139

**Ethnicity**
Non-Hispanic White	209
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	87
85 and over	37
Less than 65	15

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2018

Hypertension	58
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	26
Depression	12
Chronic Kidney Disease	23
Asthma	20
Osteoperosis	9
Atrial Fibrilation	10
Heart Failure	12
Chronic Obstructive Pulmonary Disease	21
Diabetes	19
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2019 were preventive care, vaccines and lab tests.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	535
lab tests	60
preventive care	129
vaccines	83

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	103
Female	143

**Ethnicity**
Non-Hispanic White	210
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	124
From 75 to 84	75
85 and over	30
Less than 65	17

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2019

Hypertension	62
High Cholesterol	69
Stroke	0
Ischemic Heart Disease	26
Depression	12
Chronic Kidney Disease	22
Asthma	17
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	12
Chronic Obstructive Pulmonary Disease	21
Diabetes	24
Dementia	9
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2020 were preventive care, lab tests and vaccines.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	321
lab tests	54
preventive care	74
vaccines	20

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	92
Female	118

**Ethnicity**
Non-Hispanic White	187
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	73
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2020

Hypertension	48
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	25
Depression	13
Chronic Kidney Disease	18
Asthma	16
Osteoperosis	10
Atrial Fibrilation	8
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	19
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2021 were skin testing, minimally invasive procedures, allergy testing and lab tests.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

allergy testing	642
doctor visit	372
lab tests	63
minimally invasive procedures	642
preventive care	63
skin testing	642

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	97
Female	126

**Ethnicity**
Non-Hispanic White	192
Black	0
Hispanic	0
Asian	11
Other	0
Native American	0

**Age**
From 65 to 74	104
From 75 to 84	76
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2021

Hypertension	53
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	23
Depression	9
Chronic Kidney Disease	20
Asthma	16
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	18
Diabetes	14
Dementia	8
Cancer	13

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT during 2022 were lab tests and preventive care.

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

doctor visit	391
lab tests	53
preventive care	53

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	87
Female	107

**Ethnicity**
Non-Hispanic White	164
Black	0
Hispanic	0
Asian	11
Other	0
Native American	0

**Age**
From 65 to 74	84
From 75 to 84	77
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD in 2022

Hypertension	71
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	21
Depression	11
Chronic Kidney Disease	20
Asthma	24
Osteoperosis	14
Atrial Fibrilation	12
Heart Failure	8
Chronic Obstructive Pulmonary Disease	21
Diabetes	15
Dementia	6
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Nelson T. Chao, MD for Medicare patients.

The highest averages for the top procedures that Dr. Nelson T. Chao, MD treated as a pulmonologist in Shelton, CT were skin testing, allergy testing, minimally invasive procedures and hospital care.

allergy testing	765
doctor visit	499
hospital care	116
inpatient care	116
lab tests	59
minimally invasive procedures	765
preventive care	92
skin testing	765
vaccines	81

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Nelson T. Chao, MD.

**Gender**
Male	95
Female	133

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	2
Non-Hispanic White	196
Native American / Alaskan Native	0
Hispanic	8
Other	0

**Age**
75 to 84	81
85 and over	17
Less than 65	7
65 to 74	106

Average of Total of Conditions of Medicare patients treated by Dr. Nelson T. Chao, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Nelson T. Chao, MD treated were hypertension, high cholesterol, ischemic heart disease and asthma.

Hypertension	55
High Cholesterol	53
Stroke	1
Ischemic Heart Disease	23
Depression	11
Chronic Kidney Disease	17
Asthma	20
Osteoporosis	8
Heart Failure	11
Chronic Obstructive Pulmonary Disease	20
Diabetes	18
Atrial Fibrillation	7
Dementia	6
Cancer	10

Education & Training

Dr. Nelson T. Chao, MD graduated from Far Eastern University, Nicanor Reyes Medical Foundation. He completed residency at Cabrini Medical Center. He has a state license in Connecticut.

Medical School: Far Eastern University, Nicanor Reyes Medical Foundation

Residency: Cabrini Medical Center

Licensed In: Connecticut

Affiliations & Hospitals

Dr. Nelson T. Chao, MD is associated with these hospitals and organizations:

Yale New Haven Health

Ratings & Reviews

Dr. Nelson T. Chao, MD has a good overall rating with an average of 3.0 out of 5 stars based on 4 ratings. We collect ratings and reviews of Dr. Nelson T. Chao, MD from all over the web to help you find the right in Shelton, CT.

Overall Rating

(4 Ratings)

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General Payments

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

**Payments by Company**
Aastrom Biosciences, Inc	$1,625 $1,625
CSL Behring	$36 Haegarda $36
Boehringer Ingelheim Pharmaceuticals, Inc.	$32 COMBIVENT RESPIMAT $18	Spiriva $14
AstraZeneca Pharmaceuticals LP	$29 SYMBICORT $16	DALIRESP $13
Allergan Inc.	$17 VIBERZI $17

**Types of Payments**
Consulting Fee	$1,625
Food and Beverage	$63
Education	$49

Biography

Dr. Nelson Chao's specialties are adult allergy & immunology and adult pulmonology. He practices in Shelton, CT. Dr. Chao (or staff) speaks the following languages: Filipino and Chinese. These areas are among his clinical interests: drug allergy, eczema, and primary care. He is affiliated with Yale New Haven Health. He graduated from Far Eastern University, Nicanor Reyes Medical Foundation. For his professional training, Dr. Chao completed a residency program at Cabrini Medical Center. Dr. Chao is rated 3.0 stars (out of 5) by his patients. According to Yale New Haven Health, new patients are welcome to contact his office in Shelton, CT.