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Home > CA Providers > Pediatric Allergists & Immunologists

Dr. William Ezial Berger, MD

(5 Ratings)

Specializes in: Pediatric Allergy & Immunology

27800 Medical Center Road Suite 244
Mission Viejo, CA 92691

(949) 364-2900

Dr. William Ezial Berger, MD is a pediatric allergist and immunologist in Mission Viejo, CA specializing in pediatric allergy & immunology. Dr. William Ezial Berger, MD is affiliated with Children's Hospital of Orange County.

Office Locations

27800 Medical Center Road Suite 244
Mission Viejo, CA 92691

(949) 364-2900

(949) 365-0117

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In The News (see more mentions in the news)

“Dr. William Berger, an allergist practicing in Mission Viejo, said he has seen a 50% increase in patients reporting respiratory problems over the past weekend.”—"Fires Are Over, but Some Aren't Breathing Easy : Health: Experts say the smoke spread irritants. Some hospitals report more emergencies.", Los Angeles Times, February 2025

“Dr. William E. Berger was elected vice president of the American College of Allergists, a professional organization representing more than 3,000 allergy specialists.”—"San Clemente Chamber Names New Executive Manager", Los Angeles Times, January 2025

“"We're probably going to see the worst of it in April, May and June, and we'll probably have a bad fall, too," says Dr. William E. Berger, an allergist and associate clinical professor at the UC...”—"It's the Season for Sneezin' : Allergies: After a wet winter and a green spring, a bumper crop of pollen awaits O.C.'s estimated 360,000 hay fever and asthma sufferers.", Los Angeles Times, October 2024

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2012 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	2430
doctor visit	315
immunotherapy	215
injections	215
minimally invasive procedures	2088
pulmonary testing	29
skin testing	2430

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2013 were skin testing, allergy testing, minimally invasive procedures and pulmonary testing.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	2254
doctor visit	345
minimally invasive procedures	1878
pulmonary testing	20
skin testing	2254

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	75
Female	117

**Ethnicity**
Non-Hispanic White	177
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	124
From 75 to 84	46
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2013

Hypertension	53
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	27
Depression	19
Chronic Kidney Disease	8
Asthma	51
Osteoperosis	12
Atrial Fibrilation	6
Heart Failure	6
Chronic Obstructive Pulmonary Disease	11
Diabetes	20
Dementia	0
Cancer	14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2014 were skin testing, allergy testing, minimally invasive procedures and pulmonary testing.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	1346
doctor visit	237
minimally invasive procedures	1222
pulmonary testing	21
skin testing	1346

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	61
Female	86

**Ethnicity**
Non-Hispanic White	136
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	88
From 75 to 84	43
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2014

Hypertension	63
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	26
Depression	17
Chronic Kidney Disease	12
Asthma	59
Osteoperosis	11
Atrial Fibrilation	8
Heart Failure	0
Chronic Obstructive Pulmonary Disease	13
Diabetes	24
Dementia	0
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2015 were skin testing, allergy testing, minimally invasive procedures and pulmonary testing.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	2551
doctor visit	310
minimally invasive procedures	2300
pulmonary testing	14
skin testing	2551

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	136
Female	240

**Ethnicity**
Non-Hispanic White	328
Black	0
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	220
From 75 to 84	118
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2015

Hypertension	60
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	26
Depression	23
Chronic Kidney Disease	13
Asthma	48
Osteoperosis	13
Atrial Fibrilation	8
Heart Failure	11
Chronic Obstructive Pulmonary Disease	16
Diabetes	16
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2016 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	4031
breathing treatment	14
doctor visit	405
immunotherapy	227
injections	227
minimally invasive procedures	2866
pulmonary testing	33
skin testing	4031

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	77
Female	143

**Ethnicity**
Non-Hispanic White	191
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	141
From 75 to 84	57
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2016

Hypertension	55
High Cholesterol	57
Stroke	5
Ischemic Heart Disease	23
Depression	20
Chronic Kidney Disease	18
Asthma	50
Osteoperosis	12
Atrial Fibrilation	5
Heart Failure	7
Chronic Obstructive Pulmonary Disease	16
Diabetes	18
Dementia	0
Cancer	12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2017 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	3061
doctor visit	322
immunotherapy	177
injections	177
minimally invasive procedures	2700
pulmonary testing	26
skin testing	3061

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	61
Female	119

**Ethnicity**
Non-Hispanic White	154
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	54
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2017

Hypertension	59
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	21
Depression	21
Chronic Kidney Disease	15
Asthma	48
Osteoperosis	11
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	18
Diabetes	19
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2018 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	1974
doctor visit	240
immunotherapy	177
injections	177
minimally invasive procedures	1709
pulmonary testing	16
skin testing	1974

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	54
Female	92

**Ethnicity**
Non-Hispanic White	125
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	82
From 75 to 84	49
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2018

Hypertension	55
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	21
Depression	21
Chronic Kidney Disease	18
Asthma	44
Osteoperosis	12
Atrial Fibrilation	0
Heart Failure	11
Chronic Obstructive Pulmonary Disease	12
Diabetes	19
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2019 were skin testing, allergy testing, minimally invasive procedures and pulmonary testing.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	2085
doctor visit	280
minimally invasive procedures	1918
pulmonary testing	25
skin testing	2085

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	61
Female	116

**Ethnicity**
Non-Hispanic White	154
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	95
From 75 to 84	63
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2019

Hypertension	57
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	21
Depression	21
Chronic Kidney Disease	17
Asthma	49
Osteoperosis	19
Atrial Fibrilation	7
Heart Failure	8
Chronic Obstructive Pulmonary Disease	18
Diabetes	17
Dementia	0
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2020 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	2197
doctor visit	210
immunotherapy	72
injections	72
minimally invasive procedures	1985
pulmonary testing	19
skin testing	2197

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	59
Female	93

**Ethnicity**
Non-Hispanic White	136
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	95
From 75 to 84	43
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2020

Hypertension	55
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	22
Depression	19
Chronic Kidney Disease	22
Asthma	45
Osteoperosis	14
Atrial Fibrilation	7
Heart Failure	14
Chronic Obstructive Pulmonary Disease	12
Diabetes	18
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA during 2021 were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

allergy testing	1849
doctor visit	211
immunotherapy	116
injections	116
minimally invasive procedures	1655
pulmonary testing	19
skin testing	1849

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	52
Female	88

**Ethnicity**
Non-Hispanic White	121
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	47
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Ezial Berger, MD in 2021

Hypertension	51
High Cholesterol	71
Stroke	0
Ischemic Heart Disease	22
Depression	24
Chronic Kidney Disease	23
Asthma	54
Osteoperosis	19
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	14
Diabetes	19
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2021

Volume of procedures performed by Dr. William Ezial Berger, MD for Medicare patients.

The highest averages for the top procedures that Dr. William Ezial Berger, MD treated as a pediatric allergist and immunologist in Mission Viejo, CA were skin testing, allergy testing, minimally invasive procedures and immunotherapy.

allergy testing	2377
doctor visit	287
immunotherapy	164
injections	164
minimally invasive procedures	2032
pulmonary testing	22
skin testing	2377

Average Medicare Patient Data From 2012 - 2021

Information about Medicare patients treated by Dr. William Ezial Berger, MD.

**Gender**
Male	63
Female	109

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	152
Native American / Alaskan Native	0
Hispanic	3
Other	0

**Age**
75 to 84	52
85 and over	0
Less than 65	0
65 to 74	102

Average of Total of Conditions of Medicare patients treated by Dr. William Ezial Berger, MD From 2012 - 2021

The highest averages of the most common conditions of Medicare patients that Dr. William Ezial Berger, MD treated were high cholesterol, hypertension, asthma and ischemic heart disease.

Hypertension	50
High Cholesterol	53
Stroke	1
Ischemic Heart Disease	20
Depression	18
Chronic Kidney Disease	14
Asthma	44
Osteoporosis	12
Heart Failure	7
Chronic Obstructive Pulmonary Disease	13
Diabetes	17
Atrial Fibrillation	5
Dementia	1
Cancer	9

Education & Training

He is certified by the Board Certification: Allergy & Immunology Pediatrics and has a state license in California.

Board Certification: Board Certification: Allergy & Immunology Pediatrics

Licensed In: California

Affiliations & Hospitals

Dr. William Ezial Berger, MD is associated with these hospitals and organizations:

Children's Hospital of Orange County

Ratings & Reviews

Dr. William Ezial Berger, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. William Ezial Berger, MD from all over the web to help you find the right in Mission Viejo, CA.

Overall Rating

(5 Ratings)

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General Payments

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

**Payments by Company**
AstraZeneca Pharmaceuticals LP	$171,082 SYMBICORT $131,342	FASENRA $20,476	BEVESPI AEROSPHERE $7,454	BRILINTA $86	$11,724
Teva Pharmaceuticals USA, Inc.	$90,724 PROAIR $33,790	QNASL $28,463	QVAR $15,918	CINQAIR $3,804	RESPICLICK $3,150	Other $5,600
Meda Pharmaceuticals, Inc.	$53,110 Aerospan $42,871	Dymista $9,593	None $400	$246
Alcon Laboratories Inc	$48,704 Pataday $18,257	Pazeo $9,425	Patanase $1,418	Ciprodex $1,178	Vigamox $27	Other $18,400
Mylan Specialty L.P.	$42,795 Dymista $30,947	EpiPen $11,815	Aerospan $34
Other	$155,797 DUPIXENT $19,521	Spiriva $16,470	Auvi-Q $15,116	XOLAIR $13,270	Xhance $13,002	Other $78,418

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$273,287
Consulting Fee	$135,983
Travel and Lodging	$101,898
Food and Beverage	$22,804
Honoraria	$18,600
Other	$9,639

Research Payments

Dr. William Ezial Berger, MD has received 546 research payments totaling $2,482,294.

Biography

Dr. William Berger's specialty is pediatric allergy & immunology. Dr. Berger's average rating from his patients is 5.0 stars (out of 5). He is affiliated with Children's Hospital of Orange County.