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Home > AZ Providers > Intensivists & Critical Care Specialists

Dr. Gregg K. Nishi, MD

(5 Ratings)

Specializes in: General Surgery and Critical Care (Intensive Care Medicine)

George Washington University School of Medicine and Health Sciences

Professional interests include: weight loss surgery (bariatric surgery)

5301 E Grant Road
Tucson, AZ 85712

(520) 324-5695

Dr. Gregg K. Nishi, MD is a general surgeon in Tucson, AZ specializing in general surgery and critical care (intensive care medicine). He graduated from George Washington University School of Medicine and Health Sciences. Dr. Gregg K. Nishi, MD is affiliated with Cedars-Sinai.

Office Locations

5301 E Grant Road
Tucson, AZ 85712

(520) 324-5695

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9033 Wilshire Boulevard Suite 200
Beverly Hills, CA 90211

(310) 858-1242

(310) 858-1172

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Some issues Dr. Gregg K. Nishi, MD can help you with:

Weight Loss Surgery (Bariatric Surgery)

Bariatric or weight-loss surgery is a surgical procedure performed to help significantly obese patients lose weight when more traditional methods, such as dieting and exercise, have not helped. Depending on the type, these surgeries change the gastrointestinal tract to limit how much food can be eaten and also change how food is absorbed by the body. Of the various bariatric surgeries available, the most common is gastric bypass.

By far the most common of the gastric bypass surgeries is called Roux-en-Y. During this surgery, part of the stomach and small intestine are detached from the gastrointestinal tract, in order to make the tract smaller. The surgeon divides the stomach into two parts. The working stomach, at the end of the esophagus, is now tiny - only the size of a walnut. This makes patients feel full after eating a small amount of food. Then the small intestine is also divided, and after bypassing a section of the small intestine to reduce food absorption, the intestine is attached to the small stomach pouch. The patient now has a working stomach and intestine like before, only much smaller.

Because gastric bypass is used to treat extreme obesity, it can reduce the risk of some of the problems associated with obesity. Gastric bypass can help treat or reduce the risk for such conditions as heart disease, high blood pressure, sleep apnea, and type 2 diabetes. However, it is a major surgery and also carries risks itself. Any surgery can lead to infection, bleeding, or blood clots, and weight loss surgery in particular carries risks of leaks in the gastrointestinal system, malnutrition, bowel obstructions, and vomiting.

Typically patients are considered candidates for gastric bypass surgery if they have a BMI greater than 40, or sometimes if they have a BMI between 35 and 40 but are suffering from obesity-related illnesses such as diabetes. The outlook is generally good, with most patients losing between 50-75% of their excess weight in 1-2 years. However, patients must follow strict diet guidelines so that the stomach can heal, starting with no food at all, then followed by a liquid diet for some time. For many severely obese patients who have tried strict diets before without success, gastric bypass surgery is the tool that allows them to finally achieve their weight loss and health goals.

In The News

“"When we first started doing bariatric surgery, most of the family practitioners were very much against it," said Dr. Gregg K. Nishi, a bariatric surgeon at Cedars-Sinai Medical Center.”—"Weight-loss surgery may soon be widely used", Philadelphia Inquirer, January 2010

“"When we first started doing bariatric surgery, most of the family practitioners were very much against it,"said Dr. Gregg K. Nishi, a bariatric surgeon at Cedars-Sinai Medical Center.”—"Taking weight off surgically", The Spokesman-Review, January 2010

“After about 18 months, obese European patients have lost an average of about 45 percent of their body weight, said Dr. Gregg Nishi, a surgeon at Cedars-Sinai Medical Center in Los Angeles.”—"National news briefs", Desert News, June 2009

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	84

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	52

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	19
Female	29

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

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	23

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2013

Hypertension	60
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	35
Depression	23
Chronic Kidney Disease	27
Asthma	23
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	54
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	91

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	33
Female	45

**Ethnicity**
Non-Hispanic White	46
Black	17
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	0
85 and over	0
Less than 65	25

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2014

Hypertension	69
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	47
Depression	37
Chronic Kidney Disease	23
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	24
Chronic Obstructive Pulmonary Disease	0
Diabetes	40
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	75

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	72
Female	78

**Ethnicity**
Non-Hispanic White	98
Black	28
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	58
From 75 to 84	0
85 and over	0
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2015

Hypertension	75
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	52
Depression	35
Chronic Kidney Disease	33
Asthma	0
Osteoperosis	16
Atrial Fibrilation	0
Heart Failure	23
Chronic Obstructive Pulmonary Disease	0
Diabetes	48
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregg K. Nishi, MD treated as a general surgeon in Tucson, AZ during 2016 were minimally invasive procedures, abdominal surgery and gastrointestinal procedures.

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

abdominal surgery	18
doctor visit	94
gastrointestinal procedures	18
minimally invasive procedures	18

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	50
Female	41

**Ethnicity**
Non-Hispanic White	64
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	38
From 75 to 84	0
85 and over	0
Less than 65	31

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2016

Hypertension	71
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	56
Depression	32
Chronic Kidney Disease	32
Asthma	22
Osteoperosis	15
Atrial Fibrilation	0
Heart Failure	31
Chronic Obstructive Pulmonary Disease	18
Diabetes	47
Dementia	0
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	69

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	49
Female	32

**Ethnicity**
Non-Hispanic White	50
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	0
85 and over	0
Less than 65	22

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2017

Hypertension	73
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	52
Depression	38
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	20
Chronic Obstructive Pulmonary Disease	0
Diabetes	43
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	76

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	40
Female	36

**Ethnicity**
Non-Hispanic White	51
Black	12
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	36
From 75 to 84	19
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2018

Hypertension	75
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	55
Depression	25
Chronic Kidney Disease	39
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	0
Diabetes	47
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

doctor visit	26

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	24
Female	16

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

**Age**
From 65 to 74	22
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2019

Hypertension	65
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	50
Depression	0
Chronic Kidney Disease	45
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	43
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregg K. Nishi, MD treated as a general surgeon in Tucson, AZ during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

hospital care	28
inpatient care	28

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	26
Female	17

**Age**
From 65 to 74	22
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2021

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	67
Depression	0
Chronic Kidney Disease	74
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	65
Chronic Obstructive Pulmonary Disease	51
Diabetes	37
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	54
Female	31

**Ethnicity**
Non-Hispanic White	51
Black	0
Hispanic	0
Asian	14
Other	0
Native American	0

**Age**
From 65 to 74	30
From 75 to 84	32
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	28
Ischemic Heart Disease	56
Depression	41
Chronic Kidney Disease	60
Asthma	13
Osteoperosis	0
Atrial Fibrilation	58
Heart Failure	71
Chronic Obstructive Pulmonary Disease	62
Diabetes	65
Dementia	29
Cancer	20

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gregg K. Nishi, MD treated as a general surgeon in Tucson, AZ during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

hospital care	47
inpatient care	47

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Male	85
Female	85

**Ethnicity**
Non-Hispanic White	151
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	56
From 75 to 84	67
85 and over	21
Less than 65	26

Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	27
Ischemic Heart Disease	44
Depression	31
Chronic Kidney Disease	38
Asthma	14
Osteoperosis	18
Atrial Fibrilation	39
Heart Failure	46
Chronic Obstructive Pulmonary Disease	46
Diabetes	39
Dementia	16
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Gregg K. Nishi, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregg K. Nishi, MD treated as a general surgeon in Tucson, AZ were hospital care, inpatient care, minimally invasive procedures and abdominal surgery.

abdominal surgery	18
doctor visit	70
gastrointestinal procedures	18
hospital care	37
inpatient care	37
minimally invasive procedures	18

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Gregg K. Nishi, MD.

**Gender**
Female	37
Male	41

**Ethnicity**
Black / African American	7
Asian / Pacific Islander	1
Non-Hispanic White	51
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	1
75 to 84	10
Less than 65	15
65 to 74	31

Average of Total of Conditions of Medicare patients treated by Dr. Gregg K. Nishi, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Gregg K. Nishi, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	64
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	46
Depression	23
Chronic Kidney Disease	36
Asthma	6
Osteoporosis	5
Heart Failure	27
Chronic Obstructive Pulmonary Disease	16
Diabetes	42
Atrial Fibrillation	8
Dementia	4
Cancer	4

Education & Training

Dr. Gregg K. Nishi, MD graduated from George Washington University School of Medicine and Health Sciences. He completed residency at North Shore University Hospital. He is certified by the Surgery-General Surgery, American Board of Surgery Surgery-Critical Care, American Board of Surgery and has a state license in Arizona.

Medical School: George Washington University School of Medicine and Health Sciences

Residency: North Shore University Hospital

Board Certification: Surgery-General Surgery, American Board of Surgery Surgery-Critical Care, American Board of Surgery

Licensed In: Arizona

Affiliations & Hospitals

Dr. Gregg K. Nishi, MD is associated with these hospitals and organizations:

Cedars-Sinai

Ratings & Reviews

Dr. Gregg K. Nishi, 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. Gregg K. Nishi, MD from all over the web to help you find the right in Tucson, AZ.

Overall Rating

(5 Ratings)

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General Payments

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

**Payments by Company**
Covidien LP	$13,522 ProGrip $12,556	iDrive $179	Synthetic Mesh $75	Spacemaker $58	Endo GIA $45	Other $609
Intuitive Surgical, Inc.	$8,661 Da Vinci Surgical System $8,661
Pinnacle Biologics, Inc	$1,839 Photofrin $1,839
APOLLO ENDOSURGERY INC	$845 Orbera $845
Davol Inc.	$811 3DMAX $68	$743
Other	$3,908 LINX Reflux Management System $934	ReliaTack $371	Overstitch $262	Ovitex $208	SEAMGUARD Bioabsorbable Staple $168	Other $1,966

**Types of Payments**
Consulting Fee	$12,568
Travel and Lodging	$8,647
Food and Beverage	$5,971
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$1,400
Education	$1,000

Biography

Dr. Gregg Nishi works as an adult critical care and general surgery. His areas of expertise include general surgery and weight loss surgery (bariatric surgery). The average patient rating for Dr. Nishi is 5.0 stars (out of 5). Dr. Nishi obtained his medical school training at George Washington University School of Medicine and Health Sciences and performed his residency at North Shore University Hospital and Cedars-Sinai Medical Center. He is affiliated with Cedars-Sinai. Dr. Nishi is not accepting new patients at this time according to Cedars-Sinai.