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Home > VA Providers > Radiation Oncologists

Dr. Mark Ewing Chisam, MD

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Specializes in: Radiation Oncology

3901 Treyburn Drive Suite B
Williamsburg, VA 23185

(757) 220-4900

Dr. Mark Ewing Chisam, MD is a radiation oncologist in Williamsburg, VA specializing in radiation oncology.

Office Locations

3901 Treyburn Drive Suite B
Williamsburg, VA 23185

(757) 220-4900

(757) 565-5328

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In The News

“"A lot of our patients are sick, and they have a lot of issues going on," said Dr. Mark Chisam, a Riverside radiation oncologist.”—"Knifeless surgery coming to Riverside in Williamsburg", Daily Press, December 2023

“The family would like to thank Dr. Thomas Kennedy, Dr. Mark Chisam, Dr. Troy Thompson, Patricia Robbins, NP, as well as the staff at Sentara Williamsburg Regional Medical Center who so lovingly...”—"Bradley Stein Obituary - Hampton, VA", Daily Press, May 2020

“There are no data to support improved outcomes, said radiation oncologist Mark Chisam who uses IMRT for prostate treatment at Riverside.”—"Hampton proton therapy center treating roughly one-eighth its predicted number of patients", The Virginian-Pilot, October 2015

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Ewing Chisam, MD in 2023

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

Top 5%

By Affordability:

radiation therapy

In 2023, Dr. Mark Ewing Chisam, MD had a list price for radiation therapy that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Virginia. 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 Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2012 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	832
radiation therapy	59

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2013 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	716
radiation therapy	41

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	115
Female	121

**Ethnicity**
Non-Hispanic White	206
Black	18
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	94
From 75 to 84	83
85 and over	47
Less than 65	12

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2013

Hypertension	75
High Cholesterol	63
Stroke	6
Ischemic Heart Disease	31
Depression	21
Chronic Kidney Disease	25
Asthma	8
Osteoperosis	10
Atrial Fibrilation	14
Heart Failure	16
Chronic Obstructive Pulmonary Disease	21
Diabetes	29
Dementia	8
Cancer	69

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2014 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	1025
radiation therapy	43

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	163
Female	126

**Ethnicity**
Non-Hispanic White	257
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	122
From 75 to 84	104
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2014

Hypertension	72
High Cholesterol	64
Stroke	4
Ischemic Heart Disease	42
Depression	20
Chronic Kidney Disease	28
Asthma	6
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	20
Chronic Obstructive Pulmonary Disease	19
Diabetes	30
Dementia	12
Cancer	66

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2015 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	785
radiation therapy	36

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	274
Female	242

**Ethnicity**
Non-Hispanic White	446
Black	46
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	208
From 75 to 84	190
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2015

Hypertension	73
High Cholesterol	64
Stroke	4
Ischemic Heart Disease	39
Depression	21
Chronic Kidney Disease	29
Asthma	10
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	17
Chronic Obstructive Pulmonary Disease	19
Diabetes	32
Dementia	9
Cancer	65

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2016 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	843
radiation therapy	34

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	154
Female	106

**Ethnicity**
Non-Hispanic White	227
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	99
From 75 to 84	107
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2016

Hypertension	73
High Cholesterol	67
Stroke	0
Ischemic Heart Disease	38
Depression	18
Chronic Kidney Disease	30
Asthma	17
Osteoperosis	10
Atrial Fibrilation	17
Heart Failure	18
Chronic Obstructive Pulmonary Disease	16
Diabetes	21
Dementia	6
Cancer	65

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2017 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	905
radiation therapy	35

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	148
Female	94

**Ethnicity**
Non-Hispanic White	210
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	112
From 75 to 84	88
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2017

Hypertension	75
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	37
Depression	15
Chronic Kidney Disease	25
Asthma	7
Osteoperosis	7
Atrial Fibrilation	15
Heart Failure	16
Chronic Obstructive Pulmonary Disease	13
Diabetes	24
Dementia	7
Cancer	69

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2018 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	765
radiation therapy	35

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	134
Female	104

**Ethnicity**
Non-Hispanic White	215
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	98
From 75 to 84	98
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2018

Hypertension	75
High Cholesterol	74
Stroke	0
Ischemic Heart Disease	37
Depression	18
Chronic Kidney Disease	29
Asthma	5
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	18
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	12
Cancer	68

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2019 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	685
radiation therapy	25

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	111
Female	100

**Ethnicity**
Non-Hispanic White	189
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	91
From 75 to 84	81
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2019

Hypertension	69
High Cholesterol	64
Stroke	6
Ischemic Heart Disease	41
Depression	17
Chronic Kidney Disease	34
Asthma	6
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	16
Chronic Obstructive Pulmonary Disease	20
Diabetes	25
Dementia	13
Cancer	69

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2020 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	605
radiation therapy	36

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	99
Female	79

**Ethnicity**
Non-Hispanic White	157
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	72
From 75 to 84	73
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2020

Hypertension	75
High Cholesterol	70
Stroke	6
Ischemic Heart Disease	37
Depression	21
Chronic Kidney Disease	28
Asthma	0
Osteoperosis	10
Atrial Fibrilation	20
Heart Failure	20
Chronic Obstructive Pulmonary Disease	16
Diabetes	24
Dementia	12
Cancer	56

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2021 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	652
radiation therapy	31

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	97
Female	91

**Ethnicity**
Non-Hispanic White	165
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	79
From 75 to 84	80
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2021

Hypertension	70
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	34
Depression	20
Chronic Kidney Disease	36
Asthma	0
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	24
Chronic Obstructive Pulmonary Disease	9
Diabetes	28
Dementia	6
Cancer	68

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA during 2022 were radiation therapy.

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

doctor visit	597
radiation therapy	27

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	103
Female	95

**Ethnicity**
Non-Hispanic White	175
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	79
From 75 to 84	81
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2022

Hypertension	74
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	27
Depression	22
Chronic Kidney Disease	20
Asthma	0
Osteoperosis	15
Atrial Fibrilation	18
Heart Failure	12
Chronic Obstructive Pulmonary Disease	20
Diabetes	26
Dementia	6
Cancer	75

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark Ewing Chisam, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark Ewing Chisam, MD treated as a radiation oncologist in Williamsburg, VA were radiation therapy.

doctor visit	764
radiation therapy	36

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark Ewing Chisam, MD.

**Gender**
Male	127
Female	105

**Ethnicity**
Black / African American	5
Asian / Pacific Islander	0
Non-Hispanic White	204
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	89
85 and over	4
Less than 65	1
65 to 74	95

Average of Total of Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD From 2012 - 2022

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

Hypertension	66
High Cholesterol	59
Stroke	3
Ischemic Heart Disease	33
Depression	17
Chronic Kidney Disease	25
Asthma	5
Osteoporosis	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	15
Diabetes	24
Atrial Fibrillation	14
Dementia	8
Cancer	60

Education & Training

He has a state license in Virginia.

Licensed In: Virginia

Ratings & Reviews

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General Payments

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

**Payments by Company**
Siemens Medical Solutions USA, Inc.	$37 SOMATOM Confidence $37
Augmenix, Inc.	$22 SpaceOAR $22
Blue Earth Diagnostics Limited	$21 Axumin $21
INSYS Therapeutics Inc	$18 SUBSYS $18

**Types of Payments**
Food and Beverage	$98

Biography

Dr. Mark Chisam specializes in radiation oncology and practices in Williamsburg, VA. Dr. Chisam obtained a license to practice in Virginia.

Select Year:

Dr. Mark Ewing Chisam, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Ewing Chisam, MD in 2023

By Affordability:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD in 2022

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

Average of Total of Conditions of Medicare patients treated by Dr. Mark Ewing Chisam, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Biography

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