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Dr. John Alan Leonard, MD

Accepting New Patients

(No ratings)

Specializes in: Emergency Medicine
University of California, Davis, School of Medicine
1601 Ygnacio Valley Road
Walnut Creek, CA 94598

Dr. John Alan Leonard, MD is an emergency medicine doctor in Walnut Creek, CA specializing in emergency medicine. He graduated from University of California, Davis, School of Medicine. Dr. John Alan Leonard, MD is affiliated with John Muir Health.

View Doctor's Full Profile (925) 939-3000

Office Locations

1601 Ygnacio Valley Road
Walnut Creek, CA 94598
(925) 939-3000
open_in_new

John Muir Health

2540 East Street
Concord, CA 94520
(925) 674-2333
(925) 674-2335
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Noteworthy Medicare Patient Procedures Performed by Dr. John Alan Leonard, 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. John Alan Leonard, 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. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2012 were emergency care.

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

emergency care 689

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2013 were emergency care.

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

emergency care 657

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 281
Female 398
Ethnicity
Non-Hispanic White 588
Black 13
Hispanic 25
Asian 37
Other 0
Native American 0
Age
From 65 to 74 149
From 75 to 84 222
85 and over 218
Less than 65 90

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2013

Hypertension 75
High Cholesterol 58
Stroke 11
Ischemic Heart Disease 41
Depression 34
Chronic Kidney Disease 42
Asthma 10
Osteoperosis 19
Atrial Fibrilation 26
Heart Failure 32
Chronic Obstructive Pulmonary Disease 19
Diabetes 27
Dementia 28
Cancer 16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2014 were emergency care.

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

emergency care 596

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 256
Female 352
Ethnicity
Non-Hispanic White 504
Black 0
Hispanic 29
Asian 36
Other 18
Native American 0
Age
From 65 to 74 149
From 75 to 84 176
85 and over 214
Less than 65 69

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2014

Hypertension 75
High Cholesterol 57
Stroke 11
Ischemic Heart Disease 40
Depression 31
Chronic Kidney Disease 43
Asthma 14
Osteoperosis 18
Atrial Fibrilation 25
Heart Failure 33
Chronic Obstructive Pulmonary Disease 21
Diabetes 25
Dementia 26
Cancer 17

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2015 were emergency care.

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

emergency care 807

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 658
Female 946
Ethnicity
Non-Hispanic White 1332
Black 68
Hispanic 72
Asian 98
Other 0
Native American 0
Age
From 65 to 74 364
From 75 to 84 478
85 and over 604
Less than 65 158

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2015

Hypertension 75
High Cholesterol 56
Stroke 17
Ischemic Heart Disease 44
Depression 34
Chronic Kidney Disease 46
Asthma 21
Osteoperosis 16
Atrial Fibrilation 28
Heart Failure 35
Chronic Obstructive Pulmonary Disease 24
Diabetes 28
Dementia 28
Cancer 15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2016 were emergency care.

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

emergency care 732

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 310
Female 428
Ethnicity
Non-Hispanic White 621
Black 23
Hispanic 0
Asian 48
Other 23
Native American 0
Age
From 65 to 74 191
From 75 to 84 230
85 and over 253
Less than 65 64

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2016

Hypertension 75
High Cholesterol 64
Stroke 15
Ischemic Heart Disease 42
Depression 36
Chronic Kidney Disease 51
Asthma 27
Osteoperosis 15
Atrial Fibrilation 26
Heart Failure 33
Chronic Obstructive Pulmonary Disease 24
Diabetes 30
Dementia 28
Cancer 15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2017 were emergency care.

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

emergency care 731

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 324
Female 445
Ethnicity
Non-Hispanic White 612
Black 45
Hispanic 29
Asian 59
Other 0
Native American 0
Age
From 65 to 74 189
From 75 to 84 254
85 and over 251
Less than 65 75

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2017

Hypertension 75
High Cholesterol 58
Stroke 12
Ischemic Heart Disease 38
Depression 35
Chronic Kidney Disease 51
Asthma 11
Osteoperosis 18
Atrial Fibrilation 28
Heart Failure 32
Chronic Obstructive Pulmonary Disease 22
Diabetes 31
Dementia 32
Cancer 19

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2018 were emergency care.

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

emergency care 728

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 308
Female 470
Ethnicity
Non-Hispanic White 635
Black 30
Hispanic 42
Asian 51
Other 20
Native American 0
Age
From 65 to 74 208
From 75 to 84 225
85 and over 268
Less than 65 77

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2018

Hypertension 75
High Cholesterol 63
Stroke 14
Ischemic Heart Disease 41
Depression 37
Chronic Kidney Disease 49
Asthma 13
Osteoperosis 16
Atrial Fibrilation 25
Heart Failure 31
Chronic Obstructive Pulmonary Disease 23
Diabetes 28
Dementia 31
Cancer 16

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2019 were emergency care.

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

emergency care 660

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 283
Female 441
Ethnicity
Non-Hispanic White 589
Black 30
Hispanic 44
Asian 37
Other 0
Native American 0
Age
From 65 to 74 192
From 75 to 84 219
85 and over 241
Less than 65 72

Conditions of Medicare patients treated by Dr. John Alan Leonard, MD in 2019

Hypertension 75
High Cholesterol 65
Stroke 13
Ischemic Heart Disease 44
Depression 37
Chronic Kidney Disease 56
Asthma 14
Osteoperosis 18
Atrial Fibrilation 23
Heart Failure 34
Chronic Obstructive Pulmonary Disease 25
Diabetes 33
Dementia 29
Cancer 16

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2020 were emergency care.

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

emergency care 506

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 283
Female 393
Ethnicity
Non-Hispanic White 528
Black 45
Hispanic 42
Asian 38
Other 0
Native American 0
Age
From 65 to 74 190
From 75 to 84 215
85 and over 194
Less than 65 77

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

Hypertension 75
High Cholesterol 67
Stroke 12
Ischemic Heart Disease 44
Depression 42
Chronic Kidney Disease 54
Asthma 14
Osteoperosis 17
Atrial Fibrilation 24
Heart Failure 34
Chronic Obstructive Pulmonary Disease 23
Diabetes 33
Dementia 32
Cancer 17

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2021 were emergency care.

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

emergency care 142

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 79
Female 102
Ethnicity
Non-Hispanic White 140
Black 12
Hispanic 0
Asian 12
Other 0
Native American 0
Age
From 65 to 74 40
From 75 to 84 56
85 and over 67
Less than 65 18

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

Hypertension 75
High Cholesterol 73
Stroke 13
Ischemic Heart Disease 43
Depression 45
Chronic Kidney Disease 59
Asthma 15
Osteoperosis 17
Atrial Fibrilation 29
Heart Failure 36
Chronic Obstructive Pulmonary Disease 20
Diabetes 31
Dementia 38
Cancer 18

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA during 2022 were emergency care.

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

emergency care 239

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 122
Female 144
Ethnicity
Non-Hispanic White 163
Black 23
Hispanic 48
Asian 0
Other 0
Native American 0
Age
From 65 to 74 100
From 75 to 84 83
85 and over 47
Less than 65 36

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

Hypertension 75
High Cholesterol 75
Stroke 21
Ischemic Heart Disease 37
Depression 34
Chronic Kidney Disease 44
Asthma 21
Osteoperosis 13
Atrial Fibrilation 30
Heart Failure 36
Chronic Obstructive Pulmonary Disease 31
Diabetes 48
Dementia 20
Cancer 17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

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

The highest averages for the top procedures that Dr. John Alan Leonard, MD treated as an emergency medicine doctor in Walnut Creek, CA were emergency care.

emergency care 589

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John Alan Leonard, MD.

Gender
Male 264
Female 374
Ethnicity
Black / African American 26
Asian / Pacific Islander 37
Non-Hispanic White 519
Native American / Alaskan Native 0
Hispanic 30
Other 5
Age
75 to 84 196
85 and over 214
Less than 65 66
65 to 74 161

Average of Total of Conditions of Medicare patients treated by Dr. John Alan Leonard, MD From 2012 - 2022

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

Hypertension 68
High Cholesterol 57
Stroke 12
Ischemic Heart Disease 37
Depression 33
Chronic Kidney Disease 45
Asthma 14
Osteoporosis 15
Heart Failure 30
Chronic Obstructive Pulmonary Disease 21
Diabetes 28
Atrial Fibrillation 24
Dementia 26
Cancer 15

Education & Training

Dr. John Alan Leonard, MD graduated from University of California, Davis, School of Medicine. He completed residency at Harbor-UCLA Medical Center. He is certified by the Certification: American Board of Emergency Medicine and has a state license in California.

Medical School: University of California, Davis, School of Medicine

Residency: Harbor-UCLA Medical Center

Board Certification: Certification: American Board of Emergency Medicine

Licensed In: California

Affiliations & Hospitals

Dr. John Alan Leonard, MD is associated with these hospitals and organizations:

John Muir Health

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General Payments

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

Payments by Company
Abbott Laboratories $145 Diagnostics
$83 		i-STAT CHEM8
$51 		i-STAT CTnl
$11
Allergan Inc. $17 DALVANCE
$17
Types of Payments
Food and Beverage $162

Biography

Dr. John Leonard is an emergency medicine specialist. In his practice, he is particularly interested in urgent care and emergency care. He attended the University of California, Davis, School of Medicine and then went on to complete his residency at Harbor-UCLA Medical Center. Dr. Leonard is conversant in Spanish. Dr. Leonard is affiliated with John Muir Health. According to John Muir Health, he is currently accepting new patients at his office in Concord, CA.

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