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Dr. Mark A. Casillas JR., FASCRS, MD

Specializes in: Colon & Rectal Surgery
University of Alabama at Birmingham School of Medicine
Professional interests include: rectal problems, colon problems
1934 Alcoa Highway Medical Building D, Suite 370
Knoxville, TN 37920

Dr. Mark A. Casillas JR., FASCRS, MD is a colon and rectal surgeon in Knoxville, TN specializing in colon & rectal surgery. He graduated from University of Alabama at Birmingham School of Medicine. Dr. Mark A. Casillas JR., FASCRS, MD is affiliated with University Physicians' Association, Inc., The University of Tennessee Medical Center and UNIVERSITY HEALTH SYSTEM, INC.

View Doctor's Full Profile (865) 305-5335

Office Locations

The University of Tennessee Medical Center

1934 Alcoa Highway Medical Building D, Suite 370
Knoxville, TN 37920
(865) 305-5335
(865) 305-8840
open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. Mark A. Casillas JR., FASCRS, MD in 2023

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

Top 5%

By Affordability:

diagnostic flexible sigmoidoscopy
diagnostic flexible sigmoidoscopy without biopsy
diagnostic sigmoidoscopy
flexible sigmoidoscopy
sigmoidoscopy

In 2023, Dr. Mark A. Casillas JR., FASCRS, MD had a list price for diagnostic flexible sigmoidoscopy, diagnostic flexible sigmoidoscopy without biopsy, diagnostic sigmoidoscopy, flexible sigmoidoscopy, and sigmoidoscopy that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Tennessee. 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 25%

By Volume:

endoscopy
lower endoscopy

By Affordability:

diagnostic proctosigmoidoscopy
diagnostic rigid proctosigmoidoscopy
proctosigmoidoscopy
rigid proctosigmoidoscopy

In 2013, among providers in related specialties within Tennessee, Dr. Mark A. Casillas JR., FASCRS, MD performed more endoscopy, and lower endoscopy procedures for Medicare patients than 75% of them and he also had a list price for diagnostic proctosigmoidoscopy, diagnostic rigid proctosigmoidoscopy, proctosigmoidoscopy, and rigid proctosigmoidoscopy 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

2013 Medicare Procedure Volume

The top procedures that Dr. Mark A. Casillas JR., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2013

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2013 were hypertension, high cholesterol, diabetes and ischemic heart disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2014

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2014 were hypertension, high cholesterol, ischemic heart disease and diabetes.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2015

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2015 were hypertension, high cholesterol, depression and ischemic heart disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2016

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2016 were hypertension, high cholesterol, depression and ischemic heart disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2017

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2017 were hypertension, high cholesterol, depression and ischemic heart disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2018

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2018 were hypertension, high cholesterol, depression and chronic kidney disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2019

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2019 were hypertension, high cholesterol, chronic kidney disease and depression.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2020

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2020 were high cholesterol, hypertension, chronic kidney disease and depression.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2021

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2021 were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2022

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2022 were high cholesterol, hypertension, cancer and depression.

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., FASCRS, 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., FASCRS, 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., FASCRS, 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., FASCRS, MD in 2023

The most common conditions of Medicare patients that Dr. Mark A. Casillas JR., FASCRS, MD treated during 2023 were high cholesterol, hypertension, cancer and ischemic heart disease.

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

Average Medicare Procedure Volume From 2013 - 2023

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

The highest averages for the top procedures that Dr. Mark A. Casillas JR., FASCRS, 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 23
doctor visit 182
excision 12
gastrointestinal procedures 148
gynecologic procedures 13
hospital care 14
injections 11
inpatient care 14
minimally invasive procedures 138
open surgery 13
pelvic surgery 13
preventive care 12
removal of internal scar tissue 13
removal of lesion (e.g. growth) 25

Average Medicare Patient Data From 2013 - 2023

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

Gender
Male 84
Female 113
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 85
Native American / Alaskan Native 0
Hispanic 0
Other 0
Age
75 to 84 41
85 and over 6
Less than 65 25
65 to 74 102

Average of Total of Conditions of Medicare patients treated by Dr. Mark A. Casillas JR., FASCRS, MD From 2013 - 2023

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

Hypertension 69
High Cholesterol 61
Stroke 0
Ischemic Heart Disease 29
Depression 30
Chronic Kidney Disease 29
Asthma 7
Osteoporosis 8
Heart Failure 14
Chronic Obstructive Pulmonary Disease 16
Diabetes 27
Atrial Fibrillation 10
Cancer 27
Dementia 5

Education & Training

Dr. Mark A. Casillas JR., FASCRS, MD graduated from University of Alabama at Birmingham School of Medicine. He completed residency at Saint Joseph Mercy Health System. He is certified by the American Board of Surgery, Board Certified in Colon & Rectal Surgery and has a state license in Rhode Island.

Medical School: University of Alabama at Birmingham School of Medicine

Residency: Saint Joseph Mercy Health System

Board Certification: American Board of Surgery, Board Certified in Colon & Rectal Surgery

Licensed In: Rhode Island

Affiliations & Hospitals

Dr. Mark A. Casillas JR., FASCRS, MD is associated with these hospitals and organizations:

University Physicians' Association, Inc.
The University of Tennessee Medical Center
UNIVERSITY HEALTH SYSTEM, INC

Ratings & Reviews

Dr. Mark A. Casillas JR., FASCRS, MD has an exceptional overall rating with an average of 4.86 out of 5 stars based on 166 ratings. We collect ratings and reviews of Dr. Mark A. Casillas JR., FASCRS, MD from all over the web to help you find the right in Knoxville, TN. 

4.86
Overall Rating
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General Payments

These charts describe general payments received by Dr. Mark A. Casillas JR., FASCRS, 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 $551 Energy: Enseal
$169 		Echelon Powered Circular
$120 		ETHICON
$57 		Echelon; Endopath
$33 		CONTOUR
$26 		Other
$145
Applied Medical Resources Corporation $520 GELPOINT PATH
$520
Other $4,323 OFIRMEV
$361 		Xerava
$254 		GATTEX
$245 		INTERSTIM
$221 		Solesta
$197 		Other
$3,046
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 $7,206
Travel and Lodging $1,434
Education $147
Gift $11

Biography

Dr. Mark Casillas is a colon & rectal surgery specialist. Patients gave him an average rating of 5.0 stars (out of 5). Dr. Casillas has a special interest in colorectal surgery procedures, colon problems, and rectal problems. His professional affiliations include the University Physicians' Association, Inc. and The University of Tennessee Medical Center. Dr. Casillas obtained his medical school training at the University of Alabama at Birmingham School of Medicine and performed his residency at Saint Joseph Mercy Health System.

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