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Dr. Marshall Leonard, MD

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Specializes in: Emergency Medicine

300 Community Drive
Manhasset, NY 11030

(516) 562-1238

Dr. Marshall Leonard, MD is an emergency medicine doctor in Stony Brook, NY specializing in emergency medicine.

Office Locations

100 Nicolls Road, Hsc L4 Room 50
Stony Brook, NY 11794

(631) 444-2478

open_in_new

300 Community Drive
Manhasset, NY 11030

(516) 562-1238

open_in_new

Stony Brook Medicine? Department of Emergency Medicine Hsc Level 4 Room 080
Stony Brook, NY 11794

(631) 444-3880

(631) 444-3919

open_in_new

In The News

“"Marshall Leonard, a former soccer star at Brookstone and Shaw high schools in Columbus who earned a scholarship at the University of Virginia and played six seasons in Major League Soccer for the...”—"'This is what I signed up for.' Former Columbus soccer star now on front lines of COVID-19", Columbus Ledger-Enquirer, April 2020

Noteworthy Medicare Patient Procedures Performed by Dr. Marshall Leonard, MD in 2023

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

Top 10%

By Volume:

emergency room care

In 2023, Dr. Marshall Leonard, MD performed more emergency room (ER) care procedures for Medicare patients than 90% of providers in related specialties within New York.

Top 25%

By Affordability:

emergency care

emergency room care

In 2013, Dr. Marshall Leonard, MD had a list price for emergency care, and emergency room (ER) care that was lower than the list prices billed to Medicare by 75% of providers in related specialties within New York. 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

2020 Medicare Procedure Volume

The top procedures that Dr. Marshall Leonard, MD treated as an emergency medicine doctor in Stony Brook, NY during 2020 were emergency care, outpatient care and hospital care.

Volume of procedures performed by Dr. Marshall Leonard, MD for Medicare patients.

emergency care	279
hospital care	15
outpatient care	15

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Marshall Leonard, MD.

**Gender**
Male	161
Female	163

**Ethnicity**
Non-Hispanic White	273
Black	17
Hispanic	19
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	103
From 75 to 84	88
85 and over	72
Less than 65	61

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2020

The most common conditions of Medicare patients that Dr. Marshall Leonard, MD treated during 2020 were high cholesterol, hypertension, ischemic heart disease and chronic kidney disease.

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	60
Depression	44
Chronic Kidney Disease	59
Asthma	10
Osteoperosis	12
Atrial Fibrilation	22
Heart Failure	35
Chronic Obstructive Pulmonary Disease	25
Diabetes	45
Dementia	35
Cancer	18

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Marshall Leonard, MD treated as an emergency medicine doctor in Stony Brook, NY during 2021 were emergency care, outpatient care, hospital care and blood draw.

Volume of procedures performed by Dr. Marshall Leonard, MD for Medicare patients.

blood draw	13
emergency care	639
hospital care	22
outpatient care	22

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Marshall Leonard, MD.

**Gender**
Male	326
Female	406

**Ethnicity**
Non-Hispanic White	632
Black	40
Hispanic	29
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	197
From 75 to 84	253
85 and over	190
Less than 65	92

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2021

The most common conditions of Medicare patients that Dr. Marshall Leonard, MD treated during 2021 were high cholesterol, hypertension, ischemic heart disease and chronic kidney disease.

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	65
Depression	46
Chronic Kidney Disease	59
Asthma	11
Osteoperosis	14
Atrial Fibrilation	26
Heart Failure	42
Chronic Obstructive Pulmonary Disease	28
Diabetes	45
Dementia	37
Cancer	19

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Marshall Leonard, MD treated as an emergency medicine doctor in Stony Brook, NY during 2022 were emergency care, outpatient care, hospital care and blood draw.

Volume of procedures performed by Dr. Marshall Leonard, MD for Medicare patients.

blood draw	11
emergency care	606
hospital care	12
outpatient care	12

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Marshall Leonard, MD.

**Gender**
Male	317
Female	361

**Ethnicity**
Non-Hispanic White	582
Black	28
Hispanic	30
Asian	15
Other	23
Native American	0

**Age**
From 65 to 74	163
From 75 to 84	281
85 and over	173
Less than 65	61

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2022

The most common conditions of Medicare patients that Dr. Marshall Leonard, MD treated during 2022 were high cholesterol, hypertension, ischemic heart disease and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	24
Ischemic Heart Disease	57
Depression	42
Chronic Kidney Disease	41
Asthma	15
Osteoperosis	20
Atrial Fibrilation	39
Heart Failure	40
Chronic Obstructive Pulmonary Disease	31
Diabetes	47
Dementia	30
Cancer	24

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Marshall Leonard, MD treated as an emergency medicine doctor in Stony Brook, NY during 2023 were emergency care, hospital care and inpatient care.

Volume of procedures performed by Dr. Marshall Leonard, MD for Medicare patients.

emergency care	544
hospital care	35
inpatient care	35

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Marshall Leonard, MD.

**Gender**
Male	305
Female	336

**Ethnicity**
Non-Hispanic White	551
Black	31
Hispanic	28
Asian	15
Other	16
Native American	0

**Age**
From 65 to 74	164
From 75 to 84	212
85 and over	157
Less than 65	108

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2023

The most common conditions of Medicare patients that Dr. Marshall Leonard, MD treated during 2023 were high cholesterol, hypertension, ischemic heart disease and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	23
Ischemic Heart Disease	55
Depression	43
Chronic Kidney Disease	39
Asthma	16
Osteoperosis	18
Atrial Fibrilation	30
Heart Failure	34
Chronic Obstructive Pulmonary Disease	28
Diabetes	46
Dementia	30
Cancer	25

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2020 - 2023

Volume of procedures performed by Dr. Marshall Leonard, MD for Medicare patients.

The highest averages for the top procedures that Dr. Marshall Leonard, MD treated as an emergency medicine doctor in Stony Brook, NY were emergency care, inpatient care, hospital care and outpatient care.

blood draw	12
emergency care	517
hospital care	21
inpatient care	35
outpatient care	16

Average Medicare Patient Data From 2020 - 2023

Information about Medicare patients treated by Dr. Marshall Leonard, MD.

**Gender**
Female	316
Male	277

**Ethnicity**
Black / African American	29
Asian / Pacific Islander	7
Non-Hispanic White	509
Hispanic	26
Native American / Alaskan Native	0
Other	9

**Age**
85 and over	148
75 to 84	208
Less than 65	80
65 to 74	156

Average of Total of Conditions of Medicare patients treated by Dr. Marshall Leonard, MD From 2020 - 2023

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

Hypertension	75
High Cholesterol	75
Stroke	18
Ischemic Heart Disease	59
Depression	43
Chronic Kidney Disease	49
Asthma	13
Osteoporosis	16
Heart Failure	37
Chronic Obstructive Pulmonary Disease	28
Diabetes	45
Atrial Fibrillation	29
Cancer	21
Dementia	33

Education & Training

He has a state license in New York.

Licensed In: New York

Ratings & Reviews

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Biography

Dr. Marshall Leonard is an emergency medicine specialist in Manhasset, NY and Stony Brook, NY. Dr. Leonard has obtained a license to practice in New York.

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Dr. Marshall Leonard, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Marshall Leonard, MD in 2023

By Volume:

By Affordability:

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marshall Leonard, MD in 2023

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2020 - 2023

Average Medicare Patient Data From 2020 - 2023

Average of Total of Conditions of Medicare patients treated by Dr. Marshall Leonard, MD From 2020 - 2023

Education & Training

Ratings & Reviews

Biography

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