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Dr. John P Fruehauf, MD

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Specializes in: Adult Oncology, General Surgery and Adult Hematology

Rush Medical College

Professional interests include: cancer, melanoma, genitourinary cancer, and more.

101 The City Drive South
Orange, CA 92868

(714) 456-8978

Dr. John P Fruehauf, MD is an oncologist in Orange, CA specializing in adult oncology, general surgery and adult hematology. He graduated from Rush Medical College. Dr. John P Fruehauf, MD is affiliated with UCI Health.

Office Locations

101 The City Drive South
Orange, CA 92868

(714) 456-8978

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1640 Newport Boulevard Suite 400
Costa Mesa, CA 92627

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In The News (see more mentions in the news)

“John Fruehauf has been appointed vice president... John Fruehauf has been appointed vice president and medical director of Oncotech Inc., an Irvine company that provides laboratory services to...”—"John Fruehauf has been appointed vice president...", Los Angeles Times, June 2025

“Some cancerous tumors simply stop growing or even shrink, without treatment, says Dr. John P. Fruehauf, an oncologist at UCI Medical Center.”—"Gerson health regimen is controversial", The Orange County Register, November 2012

“Dr. John Fruehauf, a urologic oncologist at UC Irvine Medical Center, said he understands the concern about overtreatment.”—"Prostate cancer - to test or not to test", The Orange County Register, December 2011

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA during 2012 were hospital care and inpatient care.

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	698
hospital care	11
inpatient care	11

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	519
hospital care	104
inpatient care	104

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	130
Female	48

**Ethnicity**
Non-Hispanic White	131
Black	0
Hispanic	0
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	74
From 75 to 84	60
85 and over	22
Less than 65	22

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2013

Hypertension	72
High Cholesterol	52
Stroke	7
Ischemic Heart Disease	35
Depression	22
Chronic Kidney Disease	46
Asthma	0
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	35
Dementia	8
Cancer	54

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA during 2014 were hospital care and inpatient care.

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	429
hospital care	95
inpatient care	95

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	96
Female	45

**Ethnicity**
Non-Hispanic White	112
Black	0
Hispanic	17
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	51
From 75 to 84	45
85 and over	23
Less than 65	22

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2014

Hypertension	70
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	31
Depression	23
Chronic Kidney Disease	43
Asthma	0
Osteoperosis	0
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	9
Diabetes	26
Dementia	10
Cancer	41

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	449
hospital care	65
inpatient care	65

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	238
Female	98

**Ethnicity**
Non-Hispanic White	242
Black	0
Hispanic	0
Asian	46
Other	0
Native American	0

**Age**
From 65 to 74	134
From 75 to 84	108
85 and over	42
Less than 65	52

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2015

Hypertension	75
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	39
Depression	24
Chronic Kidney Disease	54
Asthma	13
Osteoperosis	0
Atrial Fibrilation	12
Heart Failure	17
Chronic Obstructive Pulmonary Disease	17
Diabetes	28
Dementia	10
Cancer	45

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	504
hospital care	122
inpatient care	122

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	141
Female	48

**Ethnicity**
Non-Hispanic White	140
Black	0
Hispanic	0
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	79
From 75 to 84	52
85 and over	23
Less than 65	35

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2016

Hypertension	70
High Cholesterol	52
Stroke	8
Ischemic Heart Disease	35
Depression	23
Chronic Kidney Disease	47
Asthma	15
Osteoperosis	6
Atrial Fibrilation	13
Heart Failure	19
Chronic Obstructive Pulmonary Disease	15
Diabetes	25
Dementia	8
Cancer	37

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	421

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	107
Female	30

**Ethnicity**
Non-Hispanic White	118
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	53
From 75 to 84	53
85 and over	14
Less than 65	17

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2017

Hypertension	66
High Cholesterol	48
Stroke	9
Ischemic Heart Disease	37
Depression	18
Chronic Kidney Disease	38
Asthma	0
Osteoperosis	0
Atrial Fibrilation	14
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	28
Dementia	9
Cancer	37

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	387

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	103
Female	29

**Ethnicity**
Non-Hispanic White	108
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	50
From 75 to 84	47
85 and over	17
Less than 65	18

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2018

Hypertension	58
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	34
Depression	14
Chronic Kidney Disease	44
Asthma	0
Osteoperosis	0
Atrial Fibrilation	18
Heart Failure	16
Chronic Obstructive Pulmonary Disease	0
Diabetes	27
Dementia	0
Cancer	32

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	336

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	89
Female	24

**Ethnicity**
Non-Hispanic White	90
Black	0
Hispanic	0
Asian	12
Other	0
Native American	0

**Age**
From 65 to 74	44
From 75 to 84	43
85 and over	15
Less than 65	11

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2019

Hypertension	66
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	41
Depression	17
Chronic Kidney Disease	36
Asthma	0
Osteoperosis	0
Atrial Fibrilation	16
Heart Failure	13
Chronic Obstructive Pulmonary Disease	10
Diabetes	22
Dementia	0
Cancer	37

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	260

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	85
Female	26

**Ethnicity**
Non-Hispanic White	84
Black	0
Hispanic	0
Asian	12
Other	0
Native American	0

**Age**
From 65 to 74	47
From 75 to 84	43
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2020

Hypertension	55
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	45
Depression	14
Chronic Kidney Disease	38
Asthma	0
Osteoperosis	0
Atrial Fibrilation	12
Heart Failure	13
Chronic Obstructive Pulmonary Disease	11
Diabetes	22
Dementia	0
Cancer	31

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	242

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	78
Female	20

**Ethnicity**
Non-Hispanic White	79
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	46
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2021

Hypertension	66
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	49
Depression	16
Chronic Kidney Disease	40
Asthma	0
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	13
Diabetes	23
Dementia	0
Cancer	39

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

doctor visit	245

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	74
Female	22

**Ethnicity**
Non-Hispanic White	76
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	37
From 75 to 84	41
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John P Fruehauf, MD in 2022

Hypertension	75
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	39
Depression	11
Chronic Kidney Disease	31
Asthma	0
Osteoperosis	0
Atrial Fibrilation	17
Heart Failure	0
Chronic Obstructive Pulmonary Disease	11
Diabetes	24
Dementia	0
Cancer	48

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John P Fruehauf, MD for Medicare patients.

The highest averages for the top procedures that Dr. John P Fruehauf, MD treated as an oncologist in Orange, CA were hospital care and inpatient care.

doctor visit	408
hospital care	79
inpatient care	79

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John P Fruehauf, MD.

**Gender**
Male	103
Female	35

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	10
Non-Hispanic White	107
Native American / Alaskan Native	0
Hispanic	1
Other	0

**Age**
75 to 84	48
85 and over	14
Less than 65	16
65 to 74	55

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

The highest averages of the most common conditions of Medicare patients that Dr. John P Fruehauf, MD treated were hypertension, high cholesterol, chronic kidney disease and cancer.

Hypertension	61
High Cholesterol	48
Stroke	2
Ischemic Heart Disease	35
Depression	16
Chronic Kidney Disease	37
Asthma	2
Osteoporosis	1
Heart Failure	13
Chronic Obstructive Pulmonary Disease	10
Diabetes	23
Atrial Fibrillation	12
Dementia	4
Cancer	36

Education & Training

Dr. John P Fruehauf, MD graduated from Rush Medical College. He completed residency at University of California, Irvine Affiliated Hospitals. He is certified by the American Board of Internal Medicine - Medical Oncology American Board of Internal Medicine - Internal Medicine and has a state license in California.

Medical School: Rush Medical College

Residency: University of California, Irvine Affiliated Hospitals

Board Certification: American Board of Internal Medicine - Medical Oncology American Board of Internal Medicine - Internal Medicine

Licensed In: California

Affiliations & Hospitals

Dr. John P Fruehauf, MD is associated with these hospitals and organizations:

UCI Health

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General Payments

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

**Payments by Company**
Novartis Pharmaceuticals Corporation	$133,532 TAFINLAR $74,381	AFINITOR $18,871	VOTRIENT $13,521	VOTRIENT RCC $7,721	MEKINIST $4,403	Other $14,634
Merck Sharp & Dohme Corporation	$81,658 KEYTRUDA $77,278	$4,380
Genentech USA, Inc.	$42,295 Zelboraf $42,295
SANOFI-AVENTIS U.S. LLC	$37,495 JEVTANA $18,915	ELITEK $18,580
GENZYME CORPORATION	$30,285 ELITEK $15,158	JEVTANA $15,127
Other	$10,080 Zelboraf $4,165	XGEVA $800	SUTENT $778	INLYTA $750	SIR-Spheres microspheres $600	Other $2,987

**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	$217,374
Consulting Fee	$58,958
Travel and Lodging	$28,704
Compensation for serving as faculty or as a speaker for a non-accredited and noncertified continuing education program	$24,198
Food and Beverage	$6,088
Other	$25

Research Payments

Dr. John P Fruehauf, MD has received 242 research payments totaling $4,357,647.

Biography

Dr. John Fruehauf is a medical specialist in general surgery, adult hematology, and adult oncology. These areas are among his clinical interests: bladder cancer, blood cancers, and testicular cancer. He attended medical school at Rush Medical College. Dr. Fruehauf's medical residency was performed at a hospital affiliated with the University of California, Irvine. Distinctions awarded to Dr. Fruehauf include: Southern California Super Doctors 2008; Consumers Research Council of America Award for Top Oncologist; and March of Dimes Research Award. He is affiliated with UCI Health.