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Dr. Kais Rona, MD

(5 Ratings)

Specializes in: Bariatric Surgery and General Surgery

University of Southern California (USC), Keck School of Medicine (2012)

Professional interests include: gastric bypass surgery, obesity, sleeve gastrectomy, and more.

18111 Brookhurst Street Suite 5600
Fountain Valley, CA 92708

(714) 861-4666

Dr. Kais Rona, MD is a bariatric surgeon in Aliso Viejo, CA specializing in bariatric surgery and general surgery. He graduated from University of Southern California (USC), Keck School of Medicine in 2012 and has 14 years of experience. Dr. Kais Rona, MD is affiliated with Greater Newport Physicians, MemorialCare, Orange Coast Medical Center, MemorialCare Medical Group MemorialCare Independent Physicians and LEPORT SURGICAL MEDICAL CORPORATION.

Office Locations

Greater Newport Physicians

11 Mareblu Suite 200
Aliso Viejo, CA

(714) 861-4666

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1325 N Rose Drive Suite 210
Placentia, CA 92870

(714) 203-1799

(714) 203-1716

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1520 San Pablo Street Suite 4300
Los Angeles, CA 90033

(310) 972-0877

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18111 Brookhurst Street Suite 5600
Fountain Valley, CA

open_in_new

18111 Brookhurst Street Suite 5600
Fountain Valley, CA 92708

(714) 861-4666

(714) 861-4682

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Some issues Dr. Kais Rona, MD can help you with:

Gastric Bypass Surgery

Gastric bypass surgery is a procedure that promotes weight loss by reducing the stomach and altering how the digestive system absorbs and processes food. The procedure treats morbid obesity, where one's weight impairs day-to-day function or poses serious health risks. Gastric bypass surgery is used only after other weight loss treatments are unsuccessful.

Generally, gastric bypass surgery is performed on patients who have a BMI of 40 or greater, or a BMI of 35 or greater with a weight-related health condition such as type 2 diabetes. Bariatric surgeons frequently expect patients to first attempt natural weight loss for about six months to prove to the surgeon that the patient is capable of maintaining a post-surgery diet and exercise regimen.

For obese patients, gastric bypass surgery has many potential health and weight benefits. Gastric bypass surgery restricts the amount of food the stomach contains, as well as:

Reduces the calories the stomach absorbs
Alters gastrointestinal hormones, which help to heal obesity-induced metabolic syndrome
Suppresses appetite
Alleviates conditions caused or exacerbated by obesity, such as obstructive sleep apnea, heart disease, and type 2 diabetes
Contributes to mental health by improving self-esteem

During gastric bypass surgery, the stomach is stapled to reduce its size, and a small hole is created in the stomach and attached to the middle section of the small intestine. This direct connection between the stomach and the middle of the small intestine creates a channel for some food to bypass the normal route. By bypassing the upper small intestine and larger region of the stomach, food is not fully absorbed and patients do not retain the same amount of calories as before. This procedure is also sometimes referred to as "Roux-en-Y" gastric bypass surgery. Some bariatric surgeons may perform a "laparoscopic bypass" which uses a tiny camera (laparoscope) to guide the procedure.

Gastric bypass surgery is performed with general anesthesia and as preparation, a liquid diet is required for two weeks prior to undergoing the surgery. After the surgery, patients will spend about two days in the hospital and may miss work for two to three weeks. In the first month after the surgery, patients are only able to consume small portions of liquid or soft food. Even after reintroducing solid food, patients feel full quickly, sometimes after eating just two or three tablespoons. Some patients experience "dumping syndrome" (rapid processing of food into the small intestine), which is common during the recovery process. Gastric bypass surgery patients must also make permanent lifestyle changes. For example, gastric bypass patients are required to take vitamins for life after surgery and required to forever avoid certain foods, such as alcohol, sugar, and high fat food.

While the gastric bypass recovery process can be challenging, surgery results are usually swift: most gastric bypass surgery patients lose nearly half to two thirds of their starting weight within two years of surgery.

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

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Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Kais Rona, MD treated as a bariatric surgeon in Aliso Viejo, CA during 2015 were nursing home care, debridement (removal of unhealthy tissue), excision and minor procedures.

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

debridement (removal of unhealthy tissue)	94
doctor visit	22
excision	94
minor procedures	20
nursing home care	113

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	96
Female	104

**Ethnicity**
Non-Hispanic White	106
Black	42
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	48
From 75 to 84	58
85 and over	62
Less than 65	32

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2015

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2015 were hypertension, diabetes, high cholesterol and chronic kidney disease.

Hypertension	75
High Cholesterol	65
Stroke	21
Ischemic Heart Disease	52
Depression	54
Chronic Kidney Disease	63
Asthma	21
Osteoperosis	21
Atrial Fibrilation	21
Heart Failure	60
Chronic Obstructive Pulmonary Disease	35
Diabetes	71
Dementia	56
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Kais Rona, MD treated as a bariatric surgeon in Aliso Viejo, CA during 2016 were nursing home care, debridement (removal of unhealthy tissue) and excision.

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

debridement (removal of unhealthy tissue)	94
excision	94
nursing home care	152

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	34
Female	38

**Ethnicity**
Non-Hispanic White	38
Black	0
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	17
From 75 to 84	0
85 and over	34
Less than 65	0

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2016

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2016 were dementia, hypertension, chronic kidney disease and ischemic heart disease.

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	69
Depression	57
Chronic Kidney Disease	72
Asthma	38
Osteoperosis	19
Atrial Fibrilation	24
Heart Failure	56
Chronic Obstructive Pulmonary Disease	39
Diabetes	58
Dementia	75
Cancer	0

Medicare Procedure and Patient Information

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2019

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2019 were hypertension.

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

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Kais Rona, MD treated as a bariatric surgeon in Aliso Viejo, CA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

hospital care	22
inpatient care	22

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	19
Female	18

**Ethnicity**
Non-Hispanic White	24
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	12
From 75 to 84	14
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2020

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

Hypertension	75
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	46
Depression	30
Chronic Kidney Disease	51
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	41
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	11
Female	13

**Age**
From 65 to 74	12
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2021

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2021 were hypertension and high cholesterol.

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

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

doctor visit	13

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	12
Female	22

**Ethnicity**
Non-Hispanic White	23
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	12
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2022

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2022 were high cholesterol and hypertension.

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

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

doctor visit	11

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Age**
From 65 to 74	12
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Kais Rona, MD in 2023

The most common conditions of Medicare patients that Dr. Kais Rona, MD treated during 2023 were hypertension and high cholesterol.

Hypertension	75
High Cholesterol	46
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2015 - 2023

Volume of procedures performed by Dr. Kais Rona, MD for Medicare patients.

The highest averages for the top procedures that Dr. Kais Rona, MD treated as a bariatric surgeon in Aliso Viejo, CA were nursing home care, debridement (removal of unhealthy tissue), excision and hospital care.

debridement (removal of unhealthy tissue)	94
doctor visit	15
excision	94
hospital care	22
inpatient care	22
minor procedures	20
nursing home care	132

Average Medicare Patient Data From 2015 - 2023

Information about Medicare patients treated by Dr. Kais Rona, MD.

**Gender**
Male	24
Female	27

**Ethnicity**
Black / African American	6
Asian / Pacific Islander	1
Non-Hispanic White	27
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	12
85 and over	13
Less than 65	4
65 to 74	14

Average of Total of Conditions of Medicare patients treated by Dr. Kais Rona, MD From 2015 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Kais Rona, MD treated were hypertension, high cholesterol, chronic kidney disease and diabetes.

Hypertension	73
High Cholesterol	52
Stroke	3
Ischemic Heart Disease	23
Depression	20
Chronic Kidney Disease	26
Asthma	8
Osteoporosis	5
Heart Failure	16
Chronic Obstructive Pulmonary Disease	10
Diabetes	24
Atrial Fibrillation	6
Dementia	18
Cancer	0

Education & Training

Dr. Kais Rona, MD graduated from University of Southern California (USC), Keck School of Medicine in 2012. He completed residency at Los Angeles County+USC Medical Center. He has a state license in California.

Medical School: University of Southern California (USC), Keck School of Medicine (2012)

Residency: Los Angeles County+USC Medical Center (2018)

Licensed In: California

Affiliations & Hospitals

Dr. Kais Rona, MD is associated with these hospitals and organizations:

Greater Newport Physicians

MemorialCare

Orange Coast Medical Center

MemorialCare Medical Group MemorialCare Independent Physicians

LEPORT SURGICAL MEDICAL CORPORATION

Ratings & Reviews

Dr. Kais Rona, 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. Kais Rona, MD from all over the web to help you find the right in Aliso Viejo, CA.

Overall Rating

(5 Ratings)

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General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$18,163 Da Vinci Surgical System $9,163	DAVINCI XI $9,000
Medtronic, Inc.	$1,314 Signia $700	Sonicision $338	Endo GIA $146	ENDO GIA ULTRA $52	LigaSure $50	Other $27
Boston Scientific Corporation	$991 RESOLUTION CLIP $627	GENERAL THERAPIES $263	WallFlex $101
Apollo Endosurgery US Inc	$907 ORBERA Intragastric Balloon System $907
Ethicon US, LLC	$620 ECHELON FLEX Stapler $345	ENSEAL Product Family $120	HARMONIC Product Family $115	VISTASEAL $25	Enseal X1 $15
Other	$484 Diamondback Coronary $134	OPTIFIX $93	3DMAX $86	PHASIX $60	GORE SYNECOR Biomaterial $49	Other $62

**Types of Payments**
Education	$15,000
Food and Beverage	$4,180
Travel and Lodging	$3,299

Biography

Dr. Kais Rona is a specialist in general surgery and bariatric surgery. He works in Fountain Valley, CA, Placentia, CA, and Los Angeles, CA. Dr. Rona has a special interest in obesity, gastric bypass surgery, and sleeve gastrectomy. He is rated 5.0 stars (out of 5) by his patients. He is a graduate of the University of Southern California (USC), Keck School of Medicine. Dr. Rona's medical residency was performed at Los Angeles County+USC Medical Center. Dr. Rona (or staff) is conversant in Spanish and Persian. He is affiliated with Orange Coast Medical Center and Greater Newport Physicians.