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Dr. Seamus David Lonergan, MD

(No ratings)

Specializes in: Emergency Medicine

University of California, San Francisco (UCSF), School of Medicine (2003)

7600 Better Way
Frisco, TX 75033

(945) 339-1000

Dr. Seamus David Lonergan, MD is an emergency medicine doctor in Grapevine, TX specializing in emergency medicine. He graduated from University of California, San Francisco (UCSF), School of Medicine in 2003 and has 23 years of experience. Dr. Seamus David Lonergan, MD is affiliated with Baylor Scott & White Health, Baylor Scott & White Medical Center - Grapevine, Baylor University Medical Center, part of Baylor Scott & White Health, Baylor Scott & White Medical Center - Frisco at PGA Parkway and Baylor Scott & White Medical Center - Irving.

Office Locations

Baylor Scott & White Medical Center - Irving

1650 W College Street
Grapevine, TX 76051

(817) 481-1588

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Baylor Scott & White Medical Center - Irving

1901 N Macarthur Boulevard
Irving, TX 75061

(972) 990-8100

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Baylor Scott & White Medical Center - Irving

3500 Gaston Avenue
Dallas, TX 75246

(214) 820-0111

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4835 Lbj Freeway Suite 900
Dallas, TX 75244

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Baylor Scott & White Medical Center - Irving

7600 Better Way
Frisco, TX 75033

(945) 339-1000

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In The News

“Let us reaffirm our commitment to testing, reducing stigma, and ensuring that all individuals, regardless of perceived risk, have access to the necessary resources for education and prevention,...”—"An ambitious plan to end HIV in Dallas", Dallas News, June 2024

“"We are seeing a ton of influenza and upper respiratory illnesses," says Seamus Lonergan, M.D., an emergency room physician at Baylor Scott & White Irving.”—"Hospitals Bracing For Bad Flu Season That's Expected To Get Worse", CBS News, January 2018

Noteworthy Medicare Patient Procedures Performed by Dr. Seamus David Lonergan, MD in 2023

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

Top 25%

By Volume:

emergency room care

In 2012, Dr. Seamus David Lonergan, MD performed more emergency room (ER) care procedures for Medicare patients than 75% of providers in related specialties within Texas.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2012 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	273

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2013 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	600

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	245
Female	379

**Ethnicity**
Non-Hispanic White	446
Black	110
Hispanic	49
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	188
From 75 to 84	180
85 and over	120
Less than 65	136

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2013

Hypertension	75
High Cholesterol	68
Stroke	13
Ischemic Heart Disease	54
Depression	44
Chronic Kidney Disease	42
Asthma	16
Osteoperosis	15
Atrial Fibrilation	19
Heart Failure	39
Chronic Obstructive Pulmonary Disease	27
Diabetes	42
Dementia	28
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2014 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	583

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	263
Female	343

**Ethnicity**
Non-Hispanic White	485
Black	64
Hispanic	37
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	207
From 75 to 84	175
85 and over	128
Less than 65	96

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2014

Hypertension	75
High Cholesterol	68
Stroke	15
Ischemic Heart Disease	53
Depression	45
Chronic Kidney Disease	43
Asthma	12
Osteoperosis	12
Atrial Fibrilation	22
Heart Failure	38
Chronic Obstructive Pulmonary Disease	25
Diabetes	40
Dementia	31
Cancer	14

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2015 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	571

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	532
Female	702

**Ethnicity**
Non-Hispanic White	924
Black	166
Hispanic	116
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	354
From 75 to 84	392
85 and over	248
Less than 65	240

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2015

Hypertension	75
High Cholesterol	69
Stroke	18
Ischemic Heart Disease	50
Depression	45
Chronic Kidney Disease	48
Asthma	25
Osteoperosis	13
Atrial Fibrilation	21
Heart Failure	37
Chronic Obstructive Pulmonary Disease	28
Diabetes	41
Dementia	30
Cancer	14

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2016 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	342

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	148
Female	222

**Ethnicity**
Non-Hispanic White	229
Black	55
Hispanic	74
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	90
From 75 to 84	115
85 and over	65
Less than 65	100

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2016

Hypertension	75
High Cholesterol	64
Stroke	15
Ischemic Heart Disease	55
Depression	40
Chronic Kidney Disease	60
Asthma	33
Osteoperosis	10
Atrial Fibrilation	21
Heart Failure	42
Chronic Obstructive Pulmonary Disease	28
Diabetes	51
Dementia	29
Cancer	14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2017 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	298

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	153
Female	195

**Ethnicity**
Non-Hispanic White	219
Black	36
Hispanic	77
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	99
From 75 to 84	100
85 and over	67
Less than 65	82

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2017

Hypertension	75
High Cholesterol	64
Stroke	18
Ischemic Heart Disease	51
Depression	40
Chronic Kidney Disease	67
Asthma	15
Osteoperosis	9
Atrial Fibrilation	18
Heart Failure	42
Chronic Obstructive Pulmonary Disease	28
Diabetes	58
Dementia	29
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2018 were emergency care, outpatient care and hospital care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	243
hospital care	12
outpatient care	12

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	122
Female	167

**Ethnicity**
Non-Hispanic White	172
Black	0
Hispanic	80
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	84
From 75 to 84	82
85 and over	47
Less than 65	76

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2018

Hypertension	75
High Cholesterol	70
Stroke	9
Ischemic Heart Disease	51
Depression	37
Chronic Kidney Disease	64
Asthma	14
Osteoperosis	11
Atrial Fibrilation	22
Heart Failure	41
Chronic Obstructive Pulmonary Disease	28
Diabetes	53
Dementia	28
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2019 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	229

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	110
Female	147

**Ethnicity**
Non-Hispanic White	174
Black	0
Hispanic	45
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	73
From 75 to 84	65
85 and over	38
Less than 65	81

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2019

Hypertension	75
High Cholesterol	63
Stroke	13
Ischemic Heart Disease	45
Depression	41
Chronic Kidney Disease	64
Asthma	12
Osteoperosis	9
Atrial Fibrilation	15
Heart Failure	40
Chronic Obstructive Pulmonary Disease	30
Diabetes	57
Dementia	28
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2020 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	178

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	100
Female	114

**Ethnicity**
Non-Hispanic White	116
Black	53
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	55
85 and over	30
Less than 65	69

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2020

Hypertension	75
High Cholesterol	70
Stroke	15
Ischemic Heart Disease	54
Depression	43
Chronic Kidney Disease	71
Asthma	15
Osteoperosis	9
Atrial Fibrilation	21
Heart Failure	52
Chronic Obstructive Pulmonary Disease	30
Diabetes	55
Dementia	29
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2021 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	210

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	109
Female	132

**Ethnicity**
Non-Hispanic White	129
Black	84
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	80
From 75 to 84	64
85 and over	41
Less than 65	56

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2021

Hypertension	75
High Cholesterol	72
Stroke	24
Ischemic Heart Disease	54
Depression	42
Chronic Kidney Disease	69
Asthma	12
Osteoperosis	11
Atrial Fibrilation	22
Heart Failure	45
Chronic Obstructive Pulmonary Disease	27
Diabetes	54
Dementia	30
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2022 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	350

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	183
Female	222

**Ethnicity**
Non-Hispanic White	335
Black	22
Hispanic	26
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	129
From 75 to 84	149
85 and over	96
Less than 65	31

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	18
Ischemic Heart Disease	45
Depression	37
Chronic Kidney Disease	39
Asthma	14
Osteoperosis	16
Atrial Fibrilation	36
Heart Failure	33
Chronic Obstructive Pulmonary Disease	27
Diabetes	36
Dementia	26
Cancer	17

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX during 2023 were emergency care.

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

emergency care	419

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	207
Female	263

**Ethnicity**
Non-Hispanic White	411
Black	0
Hispanic	23
Asian	0
Other	16
Native American	0

**Age**
From 65 to 74	139
From 75 to 84	199
85 and over	101
Less than 65	31

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	44
Depression	32
Chronic Kidney Disease	37
Asthma	14
Osteoperosis	19
Atrial Fibrilation	31
Heart Failure	33
Chronic Obstructive Pulmonary Disease	21
Diabetes	36
Dementia	25
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Seamus David Lonergan, MD for Medicare patients.

The highest averages for the top procedures that Dr. Seamus David Lonergan, MD treated as an emergency medicine doctor in Grapevine, TX were emergency care, hospital care and outpatient care.

emergency care	358
hospital care	12
outpatient care	12

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Seamus David Lonergan, MD.

**Gender**
Male	181
Female	240

**Ethnicity**
Black / African American	49
Asian / Pacific Islander	0
Non-Hispanic White	303
Hispanic	43
Native American / Alaskan Native	0
Other	2

**Age**
75 to 84	131
85 and over	81
Less than 65	83
65 to 74	125

Average of Total of Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Seamus David Lonergan, MD treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension	68
High Cholesterol	63
Stroke	14
Ischemic Heart Disease	46
Depression	37
Chronic Kidney Disease	50
Asthma	15
Osteoporosis	11
Heart Failure	36
Chronic Obstructive Pulmonary Disease	24
Diabetes	43
Atrial Fibrillation	20
Cancer	12
Dementia	26

Education & Training

Dr. Seamus David Lonergan, MD graduated from University of California, San Francisco (UCSF), School of Medicine in 2003. He completed residency at Alameda County Medical Center, Highland Hospital. He is certified by the Emergency Medicine- American Board of Emergency Medicine and has a state license in California.

Medical School: University of California, San Francisco (UCSF), School of Medicine (2003)

Residency: Alameda County Medical Center, Highland Hospital (2007)

Board Certification: Emergency Medicine- American Board of Emergency Medicine

Licensed In: California

Affiliations & Hospitals

Dr. Seamus David Lonergan, MD is associated with these hospitals and organizations:

Baylor Scott & White Health

Baylor Scott & White Medical Center - Grapevine

Baylor University Medical Center, part of Baylor Scott & White Health

Baylor Scott & White Medical Center - Frisco at PGA Parkway

Baylor Scott & White Medical Center - Irving

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. Seamus David Lonergan, MD appears to accept the following insurance providers: TriWest, Medicaid, Cigna, Superior Health Plan, Baylor Scott & White Health Plan-BSW Solutions PPO, Centivo Network-Centivo Network - Baylor Scott & White Premier, Baylor Scott & White Health Plan-BSW Plus PPO-Individual/Family, Baylor Scott & White Health Plan-BSW Plus PPO-Group, Catalyst Health Group-Catalyst Health - Baylor Scott & White Preferred, Baylor Scott & White Health Plan-BSW Premier HMO-Individual/Family, Nebraska Furniture Mart-Emerald, Baylor Scott & White Health Plan-BSW Plus HMO-Group, Baylor Scott & White Health Plan-BSW Plus HMO-Individual/Family, Prism Electric-BSW Premier - Prism, Baylor Scott & White Health Plan-BSW Access PPO, Nebraska Furniture Mart-Pearl, Baylor Scott & White Health Plan-Pyco Industries Employee Plan, Baylor Scott & White Health Plan-BSW Premier PPO, Nebraska Furniture Mart-Onyx, Baylor Scott & White Health Plan-BSW Premier HMO-Group and DFW ConnectedCare-American Airlines Employee Benefit Plan.

Insurance Accepted by Provider includes:

According to our sources, Dr. Seamus David Lonergan, MD accepts the following insurance providers:

TriWest

Medicaid

Cigna

Superior Health Plan

Baylor Scott & White Health Plan-BSW Solutions PPO

Centivo Network-Centivo Network - Baylor Scott & White Premier

Baylor Scott & White Health Plan-BSW Plus PPO-Individual/Family

Baylor Scott & White Health Plan-BSW Plus PPO-Group

Catalyst Health Group-Catalyst Health - Baylor Scott & White Preferred

Baylor Scott & White Health Plan-BSW Premier HMO-Individual/Family

Nebraska Furniture Mart-Emerald

Baylor Scott & White Health Plan-BSW Plus HMO-Group

Baylor Scott & White Health Plan-BSW Plus HMO-Individual/Family

Prism Electric-BSW Premier - Prism

Baylor Scott & White Health Plan-BSW Access PPO

Nebraska Furniture Mart-Pearl

Baylor Scott & White Health Plan-Pyco Industries Employee Plan

Baylor Scott & White Health Plan-BSW Premier PPO

Nebraska Furniture Mart-Onyx

Baylor Scott & White Health Plan-BSW Premier HMO-Group

DFW ConnectedCare-American Airlines Employee Benefit Plan

Ratings & Reviews

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General Payments

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

**Payments by Company**
Gilead Sciences, Inc.	$36,500 $36,500
Janssen Pharmaceuticals, Inc	$233 XARELTO $233
Stryker Corporation	$28 Mako $28
AstraZeneca Pharmaceuticals LP	$24 BRILINTA $24
AbbVie Inc.	$17 TEFLARO $17
Other	$63 CROFAB $15	Injectafer $13	Pradaxa $12	RAC $12	Medical Systems $11

**Types of Payments**
Consulting Fee	$36,050
Food and Beverage	$801
Travel and Lodging	$13

Biography

Dr. Seamus Lonergan is a medical specialist in emergency medicine. He is an in-network provider for several insurance carriers, including Superior Health Plan, Cigna, and Medicaid. After attending the University of California, San Francisco (UCSF), School of Medicine, Dr. Lonergan completed his residency training at Alameda County Medical Center, Highland Hospital. He is affiliated with Baylor Scott & White Medical Center - Grapevine.

Select Year:

Dr. Seamus David Lonergan, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Seamus David Lonergan, MD in 2023

By Volume:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD in 2023

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Average Medicare Patient Data From 2012 - 2023

Average of Total of Conditions of Medicare patients treated by Dr. Seamus David Lonergan, MD From 2012 - 2023

Education & Training

Affiliations & Hospitals

Insurance Information

Ratings & Reviews

General Payments

Biography

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