In 2012, among providers in related specialties within Tennessee, Dr. Mark A. Casillas JR., MD performed more colonoscopy with biopsy, colonoscopy with lesion removal, endoscopy, gastrointestinal procedures, and lower endoscopy procedures for Medicare patients than 75% of them and he also had a list price for biopsy, colon biopsy, colonoscopy, colonoscopy with biopsy, colonoscopy with lesion removal, diagnostic colonoscopy, diagnostic procedures, diagnostic proctosigmoidoscopy, diagnostic rigid proctosigmoidoscopy, gastrointestinal biopsy, gastrointestinal procedures, lower endoscopy, proctosigmoidoscopy, removal of lesion (e.g. growth), rigid proctosigmoidoscopy, therapeutic colonoscopy, and therapeutic endoscopy 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 A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2012 were minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

doctor visit	18
gastrointestinal procedures	26
minimally invasive procedures	26

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2013 were minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

doctor visit	161
gastrointestinal procedures	109
minimally invasive procedures	109

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	44
Female	77

**Age**
From 65 to 74	48
From 75 to 84	31
85 and over	11
Less than 65	31

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2013

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	36
Depression	33
Chronic Kidney Disease	26
Asthma	0
Osteoperosis	0
Atrial Fibrilation	15
Heart Failure	21
Chronic Obstructive Pulmonary Disease	13
Diabetes	40
Dementia	0
Cancer	23

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2014 were gastrointestinal procedures, minimally invasive procedures, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	12
diagnostic procedures	13
doctor visit	207
gastrointestinal procedures	144
hospital care	15
inpatient care	15
minimally invasive procedures	132
removal of lesion (e.g. growth)	13

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	62
Female	99

**Age**
From 65 to 74	70
From 75 to 84	35
85 and over	13
Less than 65	43

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2014

Hypertension	67
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	31
Depression	27
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	15
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	11
Cancer	20

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2015 were gastrointestinal procedures, minimally invasive procedures, anorectal procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	14
diagnostic procedures	11
doctor visit	202
gastrointestinal procedures	136
minimally invasive procedures	122
removal of lesion (e.g. growth)	11

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	180
Female	182

**Age**
From 65 to 74	184
From 75 to 84	0
85 and over	0
Less than 65	92

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2015

Hypertension	67
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	27
Depression	27
Chronic Kidney Disease	26
Asthma	10
Osteoperosis	8
Atrial Fibrilation	7
Heart Failure	10
Chronic Obstructive Pulmonary Disease	15
Diabetes	26
Dementia	0
Cancer	23

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2016 were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and anorectal procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	17
diagnostic procedures	17
doctor visit	225
gastrointestinal procedures	160
minimally invasive procedures	143
removal of lesion (e.g. growth)	17

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	88
Female	109

**Ethnicity**
Non-Hispanic White	181
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 A. Casillas JR., MD in 2016

Hypertension	68
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	27
Depression	27
Chronic Kidney Disease	25
Asthma	17
Osteoperosis	7
Atrial Fibrilation	8
Heart Failure	14
Chronic Obstructive Pulmonary Disease	14
Diabetes	25
Dementia	7
Cancer	25

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2017 were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and anorectal procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	23
diagnostic procedures	22
doctor visit	220
excision	12
gastrointestinal procedures	190
hospital care	13
inpatient care	13
minimally invasive procedures	167
removal of lesion (e.g. growth)	34

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	98
Female	108

**Age**
From 65 to 74	110
From 75 to 84	38
85 and over	11
Less than 65	47

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2017

Hypertension	67
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	33
Depression	35
Chronic Kidney Disease	28
Asthma	0
Osteoperosis	8
Atrial Fibrilation	6
Heart Failure	12
Chronic Obstructive Pulmonary Disease	17
Diabetes	22
Dementia	7
Cancer	28

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2018 were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	20
diagnostic procedures	27
doctor visit	227
gastrointestinal procedures	185
minimally invasive procedures	165
removal of lesion (e.g. growth)	27

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	91
Female	133

**Ethnicity**
Non-Hispanic White	212
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	120
From 75 to 84	51
85 and over	19
Less than 65	34

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2018

Hypertension	69
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	28
Depression	37
Chronic Kidney Disease	29
Asthma	6
Osteoperosis	10
Atrial Fibrilation	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	16
Diabetes	27
Dementia	8
Cancer	24

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2019 were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

abdominal surgery	13
anorectal procedures	17
diagnostic procedures	29
doctor visit	207
gastrointestinal procedures	212
gynecologic procedures	13
injections	11
minimally invasive procedures	195
open surgery	13
pelvic surgery	13
preventive care	14
removal of internal scar tissue	13
removal of lesion (e.g. growth)	29

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	89
Female	133

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

**Age**
From 65 to 74	126
From 75 to 84	46
85 and over	13
Less than 65	37

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2019

Hypertension	66
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	29
Depression	33
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	18
Diabetes	32
Dementia	7
Cancer	27

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2020 were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

anorectal procedures	12
diagnostic procedures	47
doctor visit	141
gastrointestinal procedures	158
injections	12
minimally invasive procedures	146
preventive care	12
removal of lesion (e.g. growth)	47

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	89
Female	95

**Ethnicity**
Non-Hispanic White	171
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	110
From 75 to 84	44
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2020

Hypertension	66
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	30
Depression	30
Chronic Kidney Disease	35
Asthma	6
Osteoperosis	9
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	24
Dementia	7
Cancer	29

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2021 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

diagnostic procedures	18
doctor visit	130
gastrointestinal procedures	93
minimally invasive procedures	93
removal of lesion (e.g. growth)	18

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	51
Female	102

**Age**
From 65 to 74	87
From 75 to 84	42
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2021

Hypertension	69
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	31
Depression	28
Chronic Kidney Disease	37
Asthma	10
Osteoperosis	10
Atrial Fibrilation	10
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	27
Dementia	8
Cancer	30

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

diagnostic procedures	41
doctor visit	152
gastrointestinal procedures	140
minimally invasive procedures	140
preventive care	11
removal of lesion (e.g. growth)	41

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	71
Female	114

**Ethnicity**
Non-Hispanic White	171
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	88
From 75 to 84	68
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	24
Depression	34
Chronic Kidney Disease	25
Asthma	15
Osteoperosis	16
Atrial Fibrilation	17
Heart Failure	13
Chronic Obstructive Pulmonary Disease	21
Diabetes	28
Dementia	6
Cancer	35

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2023 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

diagnostic procedures	14
doctor visit	131
gastrointestinal procedures	109
minimally invasive procedures	109
preventive care	11
removal of lesion (e.g. growth)	14

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	64
Female	96

**Age**
From 65 to 74	84
From 75 to 84	57
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2023

Hypertension	71
High Cholesterol	74
Stroke	0
Ischemic Heart Disease	29
Depression	28
Chronic Kidney Disease	27
Asthma	13
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	11
Chronic Obstructive Pulmonary Disease	24
Diabetes	20
Dementia	0
Cancer	34

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN during 2024 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

diagnostic procedures	50
doctor visit	134
gastrointestinal procedures	126
minimally invasive procedures	126
removal of lesion (e.g. growth)	50

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Male	55
Female	111

**Ethnicity**
Non-Hispanic White	155
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	79
From 75 to 84	61
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	7
Ischemic Heart Disease	30
Depression	26
Chronic Kidney Disease	27
Asthma	11
Osteoperosis	23
Atrial Fibrilation	23
Heart Failure	16
Chronic Obstructive Pulmonary Disease	15
Diabetes	24
Dementia	0
Cancer	34

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Mark A. Casillas JR., MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark A. Casillas JR., MD treated as a colon and rectal surgeon in Knoxville, TN were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and diagnostic procedures.

abdominal surgery	13
anorectal procedures	16
diagnostic procedures	26
doctor visit	165
excision	12
gastrointestinal procedures	137
gynecologic procedures	13
hospital care	14
injections	11
inpatient care	14
minimally invasive procedures	128
open surgery	13
pelvic surgery	13
preventive care	12
removal of internal scar tissue	13
removal of lesion (e.g. growth)	27

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Mark A. Casillas JR., MD.

**Gender**
Female	104
Male	75

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	84
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	39
85 and over	5
Less than 65	21
65 to 74	93

Average of Total of Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Mark A. Casillas JR., MD treated were hypertension, high cholesterol, depression and ischemic heart disease.

Hypertension	64
High Cholesterol	57
Stroke	1
Ischemic Heart Disease	27
Depression	28
Chronic Kidney Disease	26
Asthma	7
Osteoporosis	8
Heart Failure	13
Chronic Obstructive Pulmonary Disease	15
Diabetes	24
Atrial Fibrillation	10
Dementia	4
Cancer	25

Education & Training

He has a state license in Rhode Island.

Licensed In: Rhode Island

Ratings & Reviews

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General Payments

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

**Payments by Company**
Cubist Pharmaceuticals Inc	$10,290 ENTEREG $10,290
Intuitive Surgical, Inc.	$2,607 Da Vinci Surgical System $2,607
Medtronic USA, Inc.	$656 INTERSTIM $402	Sacral Nerve Stimulation - Neuro $187	Sacral Neuromodulation - ST $61	$8
Ethicon US, LLC	$615 Energy: Enseal $169	Echelon Powered Circular $120	ETHICON $57	VISTASEAL $36	Echelon; Endopath $33	Other $199
Applied Medical Resources Corporation	$520 GELPOINT PATH $520
Other	$4,621 OFIRMEV $361	GATTEX $268	Xerava $254	INTERSTIM $221	Solesta $197	Other $3,321

**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	$10,150
Food and Beverage	$7,567
Travel and Lodging	$1,434
Education	$147
Gift	$11

Biography

Dr. Mark Casillas is a general surgery and colon & rectal surgery specialist. Clinical interests for Dr. Casillas include colon problems, surgical procedures, and rectal problems. His education and training includes medical school at the University of Alabama at Birmingham School of Medicine and residency at St. Joseph Mercy Ann Arbor. Dr. Casillas is professionally affiliated with the University Physicians' Association, Inc..