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Home > CA Providers > Cardiothoracic Surgeons

Dr. Mark William Onaitis, MD

Accepting New Patients

(Mark W. Onaitis, MD)

(184 Ratings)

Specializes in: Cardiothoracic Surgery, Physician, General Surgery, Thoracic Surgery and Oncology (Cancer Care)

Duke University School of Medicine

Professional interests include: cancer, thoracic (chest) surgery procedures, lung cancer, and more.

3855 Health Sciences Drive
San Diego, CA 92037

(858) 822-6100

Dr. Mark William Onaitis, MD is a cardiothoracic surgeon in San Diego, CA specializing in cardiothoracic surgery, physician, general surgery, thoracic surgery and oncology (cancer care). He graduated from Duke University School of Medicine. Dr. Mark William Onaitis, MD is affiliated with UC San Diego Health, U.S. Department of Veterans Affairs, Scripps Health, Scripps Memorial Hospital Encinitas and UC San Diego Health.

Office Locations

3855 Health Sciences Drive
San Diego, CA 92037

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11301 Wilshire Boulevard Greater Los Angeles Vahcs (691)
Los Angeles, CA 90073

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4250 First Avenue
San Diego, CA 92103

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9300 Campus Point Drive
La Jolla, CA 92037

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Noteworthy Medicare Patient Procedures Performed by Dr. Mark William Onaitis, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Volume:

VATS segmentectomy

By Affordability:

lung segmentectomy

VATS segmentectomy

In 2024, among providers in related specialties within California, Dr. Mark William Onaitis, MD performed more VATS segmentectomy procedures for Medicare patients than 95% of them and he also had a list price for lung segmentectomy, and VATS segmentectomy that was lower than the list prices billed to Medicare by 95% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 10%

By Volume:

thoracic surgery procedures

In 2024, Dr. Mark William Onaitis, MD performed more thoracic (chest) surgery procedures procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

thoracoscopic lymphadenectomy

VATS lung resection

video-assisted thoracoscopic surgery

By Affordability:

lymph node excision

In 2012, among providers in related specialties within California, Dr. Mark William Onaitis, MD performed more thoracoscopic lymphadenectomy, VATS lung resection, and video-assisted thoracoscopic surgery (VATS) procedures for Medicare patients than 75% of them and he also had a list price for lymph node excision that was lower than the list prices billed to Medicare by 75% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2012 were thoracic (chest) surgery procedures, minimally invasive procedures, excision and dissection.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

bronchoscopy	19
dissection	31
doctor visit	283
excision	48
lobectomy	17
lymph node procedures	31
minimally invasive procedures	84
thoracic (chest) surgery procedures	85

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2013 were thoracic (chest) surgery procedures, minimally invasive procedures, excision and dissection.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

bronchoscopy	18
dissection	25
doctor visit	303
excision	38
lobectomy	17
lymph node procedures	25
minimally invasive procedures	73
thoracic (chest) surgery procedures	77

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	107
Female	93

**Ethnicity**
Non-Hispanic White	153
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	54
85 and over	11
Less than 65	26

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2013

Hypertension	71
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	49
Depression	19
Chronic Kidney Disease	28
Asthma	8
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	22
Chronic Obstructive Pulmonary Disease	39
Diabetes	36
Dementia	0
Cancer	59

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2014 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	21
doctor visit	269
excision	21
lobectomy	18
lymph node procedures	21
minimally invasive procedures	39
thoracic (chest) surgery procedures	57

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	99
Female	92

**Ethnicity**
Non-Hispanic White	145
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	104
From 75 to 84	45
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2014

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	43
Depression	17
Chronic Kidney Disease	30
Asthma	6
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	19
Chronic Obstructive Pulmonary Disease	36
Diabetes	30
Dementia	0
Cancer	58

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2015 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	15
doctor visit	251
excision	15
lobectomy	11
lymph node procedures	15
minimally invasive procedures	26
thoracic (chest) surgery procedures	42

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	216
Female	172

**Ethnicity**
Non-Hispanic White	300
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	198
From 75 to 84	114
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2015

Hypertension	75
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	50
Depression	24
Chronic Kidney Disease	32
Asthma	22
Osteoperosis	8
Atrial Fibrilation	11
Heart Failure	21
Chronic Obstructive Pulmonary Disease	36
Diabetes	29
Dementia	7
Cancer	54

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

doctor visit	94

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	53
Female	46

**Ethnicity**
Non-Hispanic White	80
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	56
From 75 to 84	25
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2016

Hypertension	68
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	56
Depression	22
Chronic Kidney Disease	36
Asthma	38
Osteoperosis	0
Atrial Fibrilation	14
Heart Failure	25
Chronic Obstructive Pulmonary Disease	41
Diabetes	31
Dementia	0
Cancer	53

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2017 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	24
doctor visit	61
excision	24
lobectomy	18
lymph node procedures	24
minimally invasive procedures	42
thoracic (chest) surgery procedures	42

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	48
Female	42

**Ethnicity**
Non-Hispanic White	69
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	29
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2017

Hypertension	72
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	59
Depression	39
Chronic Kidney Disease	36
Asthma	0
Osteoperosis	13
Atrial Fibrilation	19
Heart Failure	26
Chronic Obstructive Pulmonary Disease	42
Diabetes	31
Dementia	16
Cancer	50

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2018 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	23
doctor visit	112
excision	23
lobectomy	15
lymph node procedures	23
minimally invasive procedures	38
thoracic (chest) surgery procedures	38

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	55
Female	68

**Ethnicity**
Non-Hispanic White	92
Black	0
Hispanic	17
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	67
From 75 to 84	35
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2018

Hypertension	63
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	52
Depression	23
Chronic Kidney Disease	35
Asthma	12
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	16
Chronic Obstructive Pulmonary Disease	30
Diabetes	23
Dementia	11
Cancer	53

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2019 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	37
doctor visit	143
excision	37
lobectomy	25
lymph node procedures	37
minimally invasive procedures	62
thoracic (chest) surgery procedures	62

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	69
Female	78

**Ethnicity**
Non-Hispanic White	104
Black	0
Hispanic	28
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	70
From 75 to 84	48
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2019

Hypertension	65
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	57
Depression	29
Chronic Kidney Disease	29
Asthma	10
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	22
Chronic Obstructive Pulmonary Disease	31
Diabetes	27
Dementia	10
Cancer	55

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2020 were thoracic (chest) surgery procedures, minimally invasive procedures, excision and dissection.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	30
doctor visit	88
excision	47
lobectomy	12
lymph node procedures	30
minimally invasive procedures	59
thoracic (chest) surgery procedures	59

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	53
Female	44

**Ethnicity**
Non-Hispanic White	68
Black	0
Hispanic	11
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	50
From 75 to 84	34
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2020

Hypertension	70
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	48
Depression	26
Chronic Kidney Disease	35
Asthma	11
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	26
Diabetes	24
Dementia	0
Cancer	55

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2021 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	25
doctor visit	89
excision	25
lobectomy	11
lymph node procedures	25
minimally invasive procedures	36
thoracic (chest) surgery procedures	36

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	37
Female	52

**Ethnicity**
Non-Hispanic White	68
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	45
From 75 to 84	26
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2021

Hypertension	63
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	43
Depression	34
Chronic Kidney Disease	30
Asthma	0
Osteoperosis	19
Atrial Fibrilation	15
Heart Failure	19
Chronic Obstructive Pulmonary Disease	40
Diabetes	28
Dementia	0
Cancer	58

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2022 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	34
doctor visit	110
excision	34
lobectomy	22
lymph node procedures	34
minimally invasive procedures	56
thoracic (chest) surgery procedures	56

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	52
Female	58

**Ethnicity**
Non-Hispanic White	82
Black	0
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	50
From 75 to 84	47
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	28
Depression	21
Chronic Kidney Disease	23
Asthma	0
Osteoperosis	24
Atrial Fibrilation	25
Heart Failure	15
Chronic Obstructive Pulmonary Disease	36
Diabetes	27
Dementia	0
Cancer	66

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2023 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	34
doctor visit	97
excision	34
lobectomy	15
lymph node procedures	34
minimally invasive procedures	60
thoracic (chest) surgery procedures	60

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	52
Female	53

**Ethnicity**
Non-Hispanic White	80
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	49
From 75 to 84	44
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	45
Depression	19
Chronic Kidney Disease	25
Asthma	20
Osteoperosis	21
Atrial Fibrilation	22
Heart Failure	20
Chronic Obstructive Pulmonary Disease	32
Diabetes	29
Dementia	0
Cancer	64

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA during 2024 were thoracic (chest) surgery procedures, minimally invasive procedures, dissection and lymph node procedures.

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

dissection	34
doctor visit	113
excision	34
lobectomy	11
lymph node procedures	34
minimally invasive procedures	68
thoracic (chest) surgery procedures	68

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Male	59
Female	57

**Ethnicity**
Non-Hispanic White	82
Black	0
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	62
From 75 to 84	40
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD in 2024

Hypertension	66
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	37
Depression	22
Chronic Kidney Disease	26
Asthma	18
Osteoperosis	23
Atrial Fibrilation	24
Heart Failure	22
Chronic Obstructive Pulmonary Disease	38
Diabetes	24
Dementia	0
Cancer	59

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Mark William Onaitis, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark William Onaitis, MD treated as a cardiothoracic surgeon in San Diego, CA were thoracic (chest) surgery procedures, minimally invasive procedures, excision and dissection.

bronchoscopy	18
dissection	27
doctor visit	154
excision	31
lobectomy	16
lymph node procedures	27
minimally invasive procedures	53
thoracic (chest) surgery procedures	56

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Mark William Onaitis, MD.

**Gender**
Female	65
Male	69

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	2
Non-Hispanic White	101
Hispanic	4
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	0
75 to 84	41
Less than 65	2
65 to 74	69

Average of Total of Conditions of Medicare patients treated by Dr. Mark William Onaitis, MD From 2012 - 2024

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

Hypertension	64
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	43
Depression	22
Chronic Kidney Disease	28
Asthma	11
Osteoporosis	11
Heart Failure	19
Chronic Obstructive Pulmonary Disease	32
Diabetes	26
Atrial Fibrillation	13
Cancer	52
Dementia	3

Education & Training

Dr. Mark William Onaitis, MD graduated from Duke University School of Medicine. He completed residency at Duke University Medical Center. He is certified by the American Board of Thoracic Surgery, Thoracic and Cardiac Surgery and has a state license in California.

Medical School: Duke University School of Medicine

Residency: Duke University Medical Center

Board Certification: American Board of Thoracic Surgery, Thoracic and Cardiac Surgery (2008)

Licensed In: California

Affiliations & Hospitals

Dr. Mark William Onaitis, MD is associated with these hospitals and organizations:

UC San Diego Health

U.S. Department of Veterans Affairs

Scripps Health

Scripps Memorial Hospital Encinitas

UC San Diego Health

Ratings & Reviews

Dr. Mark William Onaitis, MD has an exceptional overall rating with an average of 4.84 out of 5 stars based on 184 ratings. We collect ratings and reviews of Dr. Mark William Onaitis, MD from all over the web to help you find the right in San Diego, CA.

4.84

Overall Rating

(184 Ratings)

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General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$159,792 Da Vinci Surgical System $159,792
Covidien LP	$91,685 superDimension $19,043	Sonicision $16,350	Electrosurgery $11,895	Endo GIA $11,001	Interventional Lung Solutions $2,511	Other $30,883
Medtronic, Inc.	$37,711 LigaSure $8,731	Signia $4,000	ENDO GIA ULTRA $322	Endo GIA $35	$24,623
Covidien Sales LLC	$6,055 Sonicision $5,675	ForceTriad $136	Ablation $125	Endo Stapling $60	iDrive $59
AstraZeneca Pharmaceuticals LP	$5,232 IMFINZI $5,115	TAGRISSO $36	$81
Other	$2,082 Photofrin $313	AtriCure cryoICE cryoSPHERE Cryoablation System $189	TELESCOPE HOPKINS DCI FOWARD $149	Transcatheter Heart Valves $144	Cardiovascular $136	Other $1,152

**Types of Payments**
Consulting Fee	$150,682
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$65,500
Travel and Lodging	$52,591
Education	$20,000
Food and Beverage	$13,783

Research Payments

Dr. Mark William Onaitis, MD has received 1 research payments totaling $2,442.

Biography

Dr. Mark Onaitis is a physician who specializes in cardiac surgery, general surgery, and oncology (cancer care). Clinical interests for Dr. Onaitis include esophageal cancer, video-assisted thoracoscopic surgery (VATS), and lung cancer. His professional affiliations include UC San Diego Health, Scripps Memorial Hospital Encinitas, and U.S. Department of Veterans Affairs. Before completing his residency at Duke University Medical Center, Dr. Onaitis attended medical school at Duke University School of Medicine. Dr. Onaitis is rated highly by his patients. His practice in LA JOLLA, CA is open to new patients as reported by Scripps Health.