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Dr. Dennis G. O'Neill, MD

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Specializes in: Pathology

University of Medicine and Dentistry of New Jersey (UMDNJ)

71 Haynes Street
Manchester, CT 06040

(860) 647-6487

Dr. Dennis G. O'Neill, MD is a pathologist in Manchester, CT specializing in pathology. He graduated from University of Medicine and Dentistry of New Jersey (UMDNJ). Dr. Dennis G. O'Neill, MD is affiliated with Eastern Connecticut Health Network, Waterbury HEALTH, Hartford Healthcare and Manchester Memorial Hospital.

Office Locations

Manchester Memorial Hospital

71 Haynes Street
Manchester, CT 06040

(860) 647-6487

(860) 647-6447

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Noteworthy Medicare Patient Procedures Performed by Dr. Dennis G. O'Neill, MD in 2024

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

Top 25%

By Volume:

lab tests

In 2012, Dr. Dennis G. O'Neill, MD performed more lab tests procedures for Medicare patients than 75% of providers in related specialties within Connecticut.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2012 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

consultation	17
cytology	92
lab tests	1371

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2013 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	64
lab tests	1249

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	376
Female	513

**Ethnicity**
Non-Hispanic White	815
Black	23
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	364
From 75 to 84	301
85 and over	97
Less than 65	127

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2013

Hypertension	71
High Cholesterol	67
Stroke	4
Ischemic Heart Disease	32
Depression	21
Chronic Kidney Disease	21
Asthma	7
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	14
Chronic Obstructive Pulmonary Disease	16
Diabetes	31
Dementia	7
Cancer	16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2014 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

consultation	15
cytology	60
lab tests	1742

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	393
Female	524

**Ethnicity**
Non-Hispanic White	827
Black	17
Hispanic	37
Asian	0
Other	18
Native American	0

**Age**
From 65 to 74	433
From 75 to 84	255
85 and over	72
Less than 65	157

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2014

Hypertension	70
High Cholesterol	65
Stroke	5
Ischemic Heart Disease	30
Depression	25
Chronic Kidney Disease	20
Asthma	11
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	11
Chronic Obstructive Pulmonary Disease	15
Diabetes	27
Dementia	7
Cancer	16

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2015 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

consultation	24
cytology	63
lab tests	1462

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	882
Female	1120

**Ethnicity**
Non-Hispanic White	1772
Black	76
Hispanic	68
Asian	0
Other	52
Native American	0

**Age**
From 65 to 74	954
From 75 to 84	522
85 and over	202
Less than 65	324

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2015

Hypertension	70
High Cholesterol	63
Stroke	5
Ischemic Heart Disease	30
Depression	27
Chronic Kidney Disease	24
Asthma	16
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	8
Cancer	17

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2016 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	36
lab tests	1829

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	509
Female	616

**Ethnicity**
Non-Hispanic White	994
Black	37
Hispanic	39
Asian	24
Other	31
Native American	0

**Age**
From 65 to 74	567
From 75 to 84	277
85 and over	99
Less than 65	182

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2016

Hypertension	70
High Cholesterol	63
Stroke	3
Ischemic Heart Disease	27
Depression	24
Chronic Kidney Disease	25
Asthma	21
Osteoperosis	6
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	17
Diabetes	30
Dementia	6
Cancer	16

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2017 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	39
lab tests	1164

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	336
Female	428

**Ethnicity**
Non-Hispanic White	672
Black	21
Hispanic	25
Asian	16
Other	30
Native American	0

**Age**
From 65 to 74	363
From 75 to 84	208
85 and over	55
Less than 65	138

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2017

Hypertension	67
High Cholesterol	54
Stroke	3
Ischemic Heart Disease	27
Depression	26
Chronic Kidney Disease	26
Asthma	11
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	16
Diabetes	29
Dementia	7
Cancer	15

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2018 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	35
lab tests	1095

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	312
Female	397

**Ethnicity**
Non-Hispanic White	612
Black	22
Hispanic	36
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	317
From 75 to 84	200
85 and over	59
Less than 65	133

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2018

Hypertension	71
High Cholesterol	64
Stroke	4
Ischemic Heart Disease	30
Depression	30
Chronic Kidney Disease	31
Asthma	12
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	17
Chronic Obstructive Pulmonary Disease	19
Diabetes	30
Dementia	8
Cancer	17

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2019 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	27
lab tests	1260

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	239
Female	285

**Ethnicity**
Non-Hispanic White	425
Black	23
Hispanic	48
Asian	12
Other	16
Native American	0

**Age**
From 65 to 74	217
From 75 to 84	145
85 and over	40
Less than 65	122

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2019

Hypertension	68
High Cholesterol	61
Stroke	2
Ischemic Heart Disease	27
Depression	32
Chronic Kidney Disease	33
Asthma	12
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	18
Diabetes	32
Dementia	9
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2020 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	48
lab tests	1227

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	289
Female	323

**Ethnicity**
Non-Hispanic White	492
Black	27
Hispanic	55
Asian	14
Other	24
Native American	0

**Age**
From 65 to 74	246
From 75 to 84	169
85 and over	76
Less than 65	121

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2020

Hypertension	67
High Cholesterol	61
Stroke	3
Ischemic Heart Disease	32
Depression	27
Chronic Kidney Disease	37
Asthma	10
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	17
Diabetes	33
Dementia	8
Cancer	18

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2021 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

consultation	18
cytology	86
lab tests	1017

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	293
Female	340

**Ethnicity**
Non-Hispanic White	517
Black	23
Hispanic	46
Asian	15
Other	32
Native American	0

**Age**
From 65 to 74	294
From 75 to 84	179
85 and over	64
Less than 65	96

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2021

Hypertension	66
High Cholesterol	63
Stroke	3
Ischemic Heart Disease	30
Depression	25
Chronic Kidney Disease	31
Asthma	11
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	29
Dementia	8
Cancer	18

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2022 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

consultation	15
cytology	57
lab tests	683

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	265
Female	314

**Ethnicity**
Non-Hispanic White	508
Black	0
Hispanic	20
Asian	0
Other	26
Native American	0

**Age**
From 65 to 74	244
From 75 to 84	189
85 and over	62
Less than 65	84

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2022

Hypertension	72
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	25
Depression	20
Chronic Kidney Disease	21
Asthma	13
Osteoperosis	13
Atrial Fibrilation	15
Heart Failure	11
Chronic Obstructive Pulmonary Disease	16
Diabetes	29
Dementia	6
Cancer	20

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2023 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	37
lab tests	765

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	246
Female	277

**Ethnicity**
Non-Hispanic White	442
Black	0
Hispanic	22
Asian	0
Other	33
Native American	0

**Age**
From 65 to 74	233
From 75 to 84	170
85 and over	54
Less than 65	66

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2023

Hypertension	68
High Cholesterol	75
Stroke	5
Ischemic Heart Disease	23
Depression	20
Chronic Kidney Disease	18
Asthma	13
Osteoperosis	14
Atrial Fibrilation	14
Heart Failure	11
Chronic Obstructive Pulmonary Disease	16
Diabetes	28
Dementia	5
Cancer	21

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT during 2024 were lab tests and cytology.

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

cytology	34
lab tests	606

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	203
Female	218

**Ethnicity**
Non-Hispanic White	361
Black	0
Hispanic	21
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	230
From 75 to 84	129
85 and over	33
Less than 65	29

Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD in 2024

Hypertension	73
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	25
Depression	20
Chronic Kidney Disease	20
Asthma	12
Osteoperosis	11
Atrial Fibrilation	15
Heart Failure	12
Chronic Obstructive Pulmonary Disease	18
Diabetes	27
Dementia	5
Cancer	18

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Dennis G. O'Neill, MD for Medicare patients.

The highest averages for the top procedures that Dr. Dennis G. O'Neill, MD treated as a pathologist in Manchester, CT were lab tests, cytology and consultation.

consultation	17
cytology	52
lab tests	1190

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Dennis G. O'Neill, MD.

**Gender**
Male	334
Female	411

**Ethnicity**
Black / African American	20
Asian / Pacific Islander	7
Non-Hispanic White	649
Native American / Alaskan Native	0
Hispanic	33
Other	21

**Age**
75 to 84	211
85 and over	70
Less than 65	121
65 to 74	343

Average of Total of Conditions of Medicare patients treated by Dr. Dennis G. O'Neill, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Dennis G. O'Neill, MD treated were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	64
High Cholesterol	60
Stroke	3
Ischemic Heart Disease	26
Depression	22
Chronic Kidney Disease	23
Asthma	11
Osteoporosis	8
Heart Failure	12
Chronic Obstructive Pulmonary Disease	15
Diabetes	27
Atrial Fibrillation	11
Cancer	15
Dementia	6

Education & Training

Dr. Dennis G. O'Neill, MD graduated from University of Medicine and Dentistry of New Jersey (UMDNJ). He has a state license in Connecticut.

Medical School: University of Medicine and Dentistry of New Jersey (UMDNJ)

Licensed In: Connecticut

Affiliations & Hospitals

Dr. Dennis G. O'Neill, MD is associated with these hospitals and organizations:

Eastern Connecticut Health Network

Waterbury HEALTH

Hartford Healthcare

Manchester Memorial Hospital

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General Payments

These charts describe general payments received by Dr. Dennis G. O'Neill, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
LEICA MICROSYSTEMS INC.	$84 EPATHOLOGY IHC APPLICATIONS 510K $84
Beckman Coulter, Inc.	$15 iChemVELOCITY $15

**Types of Payments**
Food and Beverage	$99

Biography

Dr. Dennis O'Neill's specialty is pathology. His hospital/clinic affiliations include Eastern Connecticut Health Network and Waterbury HEALTH. Dr. O'Neill welcomes new patients at his office inManchester, CT as reported by Eastern Connecticut Health Network. He attended medical school at UMDNJ-Robert Wood Johnson Medical School and UMDNJ-New Jersey Medical School.