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Dr. Gregory Garabed Simsarian, MD

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Specializes in: Emergency Medicine

University of Southern California (USC), Keck School of Medicine (1986)

24451 Health Center Drive
Laguna Hills, CA 92653

(714) 837-4500

Dr. Gregory Garabed Simsarian, MD is an emergency medicine doctor in Laguna Hills, CA specializing in emergency medicine. He graduated from University of Southern California (USC), Keck School of Medicine in 1986 and has 40 years of experience. Dr. Gregory Garabed Simsarian, MD is affiliated with Saddleback Medical Center, MemorialCare and CEP AMERICA - CALIFORNIA.

Office Locations

24451 Health Center Drive
Laguna Hills, CA

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24451 Health Center Drive
Laguna Hills, CA 92653

(714) 837-4500

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory Garabed Simsarian, MD in 2024

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. Gregory Garabed Simsarian, MD performed more emergency room (ER) care procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2012 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	692

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2013 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	639

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	211
Female	386

**Ethnicity**
Non-Hispanic White	512
Black	0
Hispanic	32
Asian	39
Other	0
Native American	0

**Age**
From 65 to 74	119
From 75 to 84	185
85 and over	253
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2013

Hypertension	75
High Cholesterol	60
Stroke	14
Ischemic Heart Disease	53
Depression	35
Chronic Kidney Disease	44
Asthma	13
Osteoperosis	18
Atrial Fibrilation	24
Heart Failure	38
Chronic Obstructive Pulmonary Disease	29
Diabetes	37
Dementia	31
Cancer	14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2014 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	693

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	247
Female	389

**Ethnicity**
Non-Hispanic White	542
Black	0
Hispanic	32
Asian	42
Other	0
Native American	0

**Age**
From 65 to 74	144
From 75 to 84	172
85 and over	277
Less than 65	43

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2014

Hypertension	75
High Cholesterol	62
Stroke	13
Ischemic Heart Disease	53
Depression	38
Chronic Kidney Disease	42
Asthma	15
Osteoperosis	18
Atrial Fibrilation	26
Heart Failure	40
Chronic Obstructive Pulmonary Disease	29
Diabetes	35
Dementia	34
Cancer	15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2015 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	661

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	518
Female	722

**Ethnicity**
Non-Hispanic White	1020
Black	0
Hispanic	84
Asian	84
Other	28
Native American	0

**Age**
From 65 to 74	298
From 75 to 84	322
85 and over	498
Less than 65	122

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2015

Hypertension	75
High Cholesterol	62
Stroke	11
Ischemic Heart Disease	51
Depression	38
Chronic Kidney Disease	43
Asthma	20
Osteoperosis	14
Atrial Fibrilation	23
Heart Failure	38
Chronic Obstructive Pulmonary Disease	23
Diabetes	39
Dementia	31
Cancer	17

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2016 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	534

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	207
Female	289

**Ethnicity**
Non-Hispanic White	416
Black	0
Hispanic	27
Asian	31
Other	0
Native American	0

**Age**
From 65 to 74	131
From 75 to 84	156
85 and over	179
Less than 65	30

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2016

Hypertension	75
High Cholesterol	64
Stroke	12
Ischemic Heart Disease	53
Depression	38
Chronic Kidney Disease	51
Asthma	27
Osteoperosis	16
Atrial Fibrilation	25
Heart Failure	40
Chronic Obstructive Pulmonary Disease	25
Diabetes	39
Dementia	32
Cancer	15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2017 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	527

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	199
Female	304

**Ethnicity**
Non-Hispanic White	412
Black	11
Hispanic	23
Asian	44
Other	13
Native American	0

**Age**
From 65 to 74	122
From 75 to 84	154
85 and over	190
Less than 65	37

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2017

Hypertension	75
High Cholesterol	62
Stroke	14
Ischemic Heart Disease	50
Depression	38
Chronic Kidney Disease	51
Asthma	12
Osteoperosis	14
Atrial Fibrilation	24
Heart Failure	41
Chronic Obstructive Pulmonary Disease	28
Diabetes	33
Dementia	31
Cancer	16

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2018 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	506

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	186
Female	302

**Ethnicity**
Non-Hispanic White	394
Black	0
Hispanic	27
Asian	42
Other	0
Native American	0

**Age**
From 65 to 74	138
From 75 to 84	141
85 and over	184
Less than 65	25

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2018

Hypertension	75
High Cholesterol	69
Stroke	11
Ischemic Heart Disease	51
Depression	35
Chronic Kidney Disease	46
Asthma	13
Osteoperosis	17
Atrial Fibrilation	24
Heart Failure	39
Chronic Obstructive Pulmonary Disease	28
Diabetes	35
Dementia	30
Cancer	17

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2019 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	497

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	202
Female	275

**Ethnicity**
Non-Hispanic White	380
Black	0
Hispanic	35
Asian	39
Other	0
Native American	0

**Age**
From 65 to 74	133
From 75 to 84	158
85 and over	156
Less than 65	30

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2019

Hypertension	75
High Cholesterol	65
Stroke	12
Ischemic Heart Disease	47
Depression	39
Chronic Kidney Disease	51
Asthma	12
Osteoperosis	14
Atrial Fibrilation	23
Heart Failure	37
Chronic Obstructive Pulmonary Disease	22
Diabetes	32
Dementia	31
Cancer	18

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2020 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	446

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	179
Female	243

**Ethnicity**
Non-Hispanic White	332
Black	0
Hispanic	28
Asian	43
Other	0
Native American	0

**Age**
From 65 to 74	128
From 75 to 84	122
85 and over	139
Less than 65	33

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2020

Hypertension	75
High Cholesterol	67
Stroke	13
Ischemic Heart Disease	52
Depression	38
Chronic Kidney Disease	55
Asthma	14
Osteoperosis	14
Atrial Fibrilation	22
Heart Failure	41
Chronic Obstructive Pulmonary Disease	24
Diabetes	34
Dementia	31
Cancer	14

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2021 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	468

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	211
Female	251

**Ethnicity**
Non-Hispanic White	366
Black	0
Hispanic	24
Asian	49
Other	0
Native American	0

**Age**
From 65 to 74	119
From 75 to 84	146
85 and over	170
Less than 65	27

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2021

Hypertension	75
High Cholesterol	68
Stroke	12
Ischemic Heart Disease	52
Depression	36
Chronic Kidney Disease	55
Asthma	10
Osteoperosis	13
Atrial Fibrilation	28
Heart Failure	37
Chronic Obstructive Pulmonary Disease	19
Diabetes	39
Dementia	34
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2022 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	474

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	199
Female	263

**Ethnicity**
Non-Hispanic White	361
Black	0
Hispanic	31
Asian	46
Other	0
Native American	0

**Age**
From 65 to 74	117
From 75 to 84	149
85 and over	167
Less than 65	29

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	23
Ischemic Heart Disease	35
Depression	35
Chronic Kidney Disease	41
Asthma	15
Osteoperosis	18
Atrial Fibrilation	38
Heart Failure	34
Chronic Obstructive Pulmonary Disease	23
Diabetes	37
Dementia	23
Cancer	18

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2023 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	445

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	190
Female	251

**Ethnicity**
Non-Hispanic White	351
Black	0
Hispanic	26
Asian	29
Other	0
Native American	0

**Age**
From 65 to 74	101
From 75 to 84	167
85 and over	151
Less than 65	22

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	23
Ischemic Heart Disease	37
Depression	34
Chronic Kidney Disease	37
Asthma	17
Osteoperosis	17
Atrial Fibrilation	36
Heart Failure	32
Chronic Obstructive Pulmonary Disease	21
Diabetes	32
Dementia	28
Cancer	22

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA during 2024 were emergency care.

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

emergency care	442

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Male	179
Female	248

**Ethnicity**
Non-Hispanic White	342
Black	0
Hispanic	23
Asian	34
Other	0
Native American	0

**Age**
From 65 to 74	125
From 75 to 84	156
85 and over	124
Less than 65	22

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	43
Depression	40
Chronic Kidney Disease	41
Asthma	14
Osteoperosis	21
Atrial Fibrilation	40
Heart Failure	34
Chronic Obstructive Pulmonary Disease	27
Diabetes	37
Dementia	24
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Gregory Garabed Simsarian, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory Garabed Simsarian, MD treated as an emergency medicine doctor in Laguna Hills, CA were emergency care.

emergency care	540

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Gregory Garabed Simsarian, MD.

**Gender**
Female	301
Male	209

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	40
Non-Hispanic White	417
Hispanic	30
Native American / Alaskan Native	0
Other	3

**Age**
85 and over	191
75 to 84	156
Less than 65	35
65 to 74	128

Average of Total of Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD From 2012 - 2024

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

Hypertension	69
High Cholesterol	61
Stroke	13
Ischemic Heart Disease	44
Depression	34
Chronic Kidney Disease	42
Asthma	14
Osteoporosis	14
Heart Failure	34
Chronic Obstructive Pulmonary Disease	22
Diabetes	33
Atrial Fibrillation	25
Cancer	15
Dementia	27

Education & Training

Dr. Gregory Garabed Simsarian, MD graduated from University of Southern California (USC), Keck School of Medicine in 1986. He completed residency at Henry Ford Hospital. He has a state license in California.

Medical School: University of Southern California (USC), Keck School of Medicine (1986)

Residency: Henry Ford Hospital (1989)

Licensed In: California

Ratings & Reviews

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General Payments

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

**Payments by Company**
Edwards Lifesciences Corporation	$107 Edwards SAPIEN 3 Transcatheter Heart Valve $107
Genentech USA, Inc.	$89 Activase $89
ABIOMED	$39 Impella $39
Janssen Pharmaceuticals, Inc	$16 XARELTO $16

**Types of Payments**
Food and Beverage	$251

Biography

Dr. Gregory Simsarian specializes in emergency medicine and practices in Laguna Hills, CA. Dr. Simsarian obtained his medical school training at the University of Southern California (USC), Keck School of Medicine and performed his residency at Henry Ford Hospital. He is affiliated with Saddleback Medical Center.

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Dr. Gregory Garabed Simsarian, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Gregory Garabed Simsarian, MD in 2024

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. Gregory Garabed Simsarian, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. Gregory Garabed Simsarian, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

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