Dr. Mark Casillas, MD

Colorectal Surgery •  Male • Age 42
  
Dr. Casillas
Accepting new patients

University Colon and Rectal Surgery

1934 Alcoa Hwy Ste D370 Knoxville, TN 37920

Make an Appointment

(865) 305-5335

Dr. Mark Casillas, MD is a Colorectal Surgery Specialist in Knoxville, TN and has over 14 years of experience in the medical field. Dr. Casillas has more experience with Colorectal Surgery than other specialists in his area. He graduated from University of Alabama At Birmingham medical school in 2006. He is affiliated with University of Tennessee Medical Center. He is accepting new patients. Be sure to call ahead with Dr. Casillas to book an appointment.


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At a Glance

  • Explains Conditions Well
    Patients said this doctor explains conditions well. See reviews
  • Hospital Satisfaction
    Patients said they were highly satisfied at this doctor's hospital. See hospitals
  • Practices at Top Hospital
    America's 250 Best Hospitals Award™ See hospitals

Insurance Check

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Dr. Casillas accepts

Accepted insurance can change. Please double-check when making an appointment.

(865) 305-5335

Dr. Casillas accepts the following insurance:

Aetna
Choice Plus POS II
Anthem
National (BlueCard) PPO
AvMed
Open Access
Blue Cross Blue Shield
Blue Card PPO
CareFirst Blue Cross Blue Shield
HealthyBlue 2.0
HealthyBlue Advantage
Cigna
Cigna HMO
Cigna PPO
LocalPlus
Open Access Plus
Commercial Insurance Company
EmblemHealth
Emblem Health
First Health (Coventry Health Care)
First Health (Coventry Health Care) PPO
Humana
Choice Care Network PPO
Choice Care PPO
Mail Handlers Benefit Plan (MHBP)
Medicaid
MultiPlan
MultiPlan PPO
PHCS Network PPO
Tricare
TriCare for Life
UnitedHealthCare
Choice Plus POS
Navigate HMO
Navigate POS
Options PPO

Background Check

No malpractice claims found for Tennessee
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
Learn more about background checks

Practice Areas

Colorectal Surgery

Colorectal surgery treats conditions affecting the colon and rectum, including colorectal cancer, inflammatory bowel disease, diverticulitis and hemorrhoids, through procedures such as tumor removal, colectomy, colostomy and resection.

Typically treats 70% more than their peers

Based on claims data for 7 conditions and procedures

TreatmentsTreatment Frequency
Excision of Rectal Tumor
very high
very high

Treatment Frequency

Dr. Casillas performs Excision of Rectal Tumor more than 99% of their peers

Dr. Casillas performs this procedure more than 99% of their peers

Colon and Rectal Surgery
very high
very high

Treatment Frequency

Dr. Casillas performs Colon and Rectal Surgery more than 92% of their peers

Dr. Casillas performs this procedure more than 92% of their peers

Hemorrhoidectomy or Excision of Anal Tags
very high
very high

Treatment Frequency

Dr. Casillas performs Hemorrhoidectomy or Excision of Anal Tags more than 91% of their peers

Dr. Casillas performs this procedure more than 91% of their peers

Check Dr. Casillas' experience treating your condition or procedure

Dr. Casillas' conditions and procedures:

  • Abdominal Disorders
  • Abscess
  • Abscess Incision and Drainage
  • Abscess or Cyst Drainage or Aspiration
  • Abscess or Fluid Incision and Drainage
  • Advanced Laparoscopic Surgery
  • Anal and Rectal Cancer
  • Anal Cancer
  • Anal Disorders
  • Anal Fissure
  • Anal Fistula
  • Anal or Rectal Pain
  • Anal Prolapse
  • Anorectal Abscess
  • Anorectal Myomectomy
  • Anoscopy
  • Anoscopy With Removal of Anal Tumor
  • Appendectomy, Laparoscopic
  • Appendectomy, Open
  • Appendicitis
  • Appendix Cancer
  • Cancer
  • Carcinoma in Situ
  • Colectomy
  • Colectomy and Sigmoidectomy With Robotic Assistance
  • Colon and Rectal Surgery
  • Colon Cancer
  • Colon Cancer Screening
  • Colon Disorders
  • Colon Polyp
  • Colon Surgery
  • Colonic Diverticulosis
  • Colonoscopy
  • Colonoscopy With Polypectomy
  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Colorectal Cancer
  • Colorectal Cancer Screening
  • Colorectal Cancer Treatment
  • Colorectal Polyp
  • Colorectal Surgery, Robotic-Assisted
  • Constipation
  • Crohn's Disease
  • da Vinci® Colectomy
  • da Vinci® Robotic Surgery
  • Destruction of Anal Tumor
  • Diverticulitis
  • Dressing and-or Debridement of Wound, Infection, or Burn (incl. Negative Pressure Wound Therapy)
  • Endoscopy
  • Enterostomy (Laparoscopic or Open)
  • Excision of Rectal Tumor
  • Familial Colorectal Cancer
  • Familial Polyposis
  • Familial Polyposis, Classical
  • Fecal Incontinence
  • Fissures
  • Fistulectomy or Fistulotomy, Anal
  • Flexible Sigmoidoscopy
  • Flexible Sigmoidoscopy With Robotic Assistance
  • Gastroenterologic Cancer (Colon, Stomach, Esophageal, Liver)
  • Gastroenterology Procedures
  • Gastrointestinal Diseases
  • Gastrointestinal Surgery
  • Hemicolectomy
  • Hemorrhoid Removal
  • Hemorrhoid Treatment
  • Hemorrhoidectomy or Excision of Anal Tags
  • Hemorrhoids
  • Hereditary Nonpolyposis Colon Cancer
  • Hernia Repair
  • Ileal Pouch-Anal Anastomosis
  • Incision and Removal of Foreign Object
  • Incisional Hernia Repair, Laparoscopic
  • Incontinence Surgery
  • Inflammatory Bowel Disease
  • Interstim® Sacral Nerve Stimulator
  • Intestinal Abscess
  • Intestinal Obstruction
  • Intestinal Transplant (incl. Enterectomy)
  • Laparoscopic Abdominoperineal Resection of the Rectum With Robotic Assistance
  • Laparoscopic Colectomy
  • Laparoscopic Colon Surgery
  • Laparoscopic Rectal Surgery
  • Laparoscopic Sigmoidectomy With Robotic Assistance
  • Laparoscopic Surgical Procedure
  • Laparoscopy
  • Meckel's Diverticulum
  • Minimal Access Surgery
  • Minimally Invasive Surgery
  • Neuroendocrine Tumors
  • Open Incisional and-or Ventral Hernia Repair
  • Pelvic Exenteration (For: Gynecologic, Urinary, or Colorectal Malignancy)
  • Pilonidal Cyst
  • Proctectomy, Open or Laparoscopic (incl. Swenson and Duhamel Procedures)
  • Proctosigmoidopexy With Robotic Assistance
  • Puncture Aspiration
  • Rectal Abscess
  • Rectal Bleeding
  • Rectal Cancer
  • Rectal Diseases
  • Rectal Prolapse
  • Rectal Surgery
  • Rectal-Colon Bleeding
  • Rectovaginal Fistula
  • Rectovaginal Repair
  • Removal of Reproductive Organs (Hysterectomy, Oophorectomy, Salpingectomy, Salpingo-Oophorectomy, Resection of Peritoneal Malignancy)
  • Removal or Destruction of Rectal or Intestinal Tumor (incl. Colonoscopy, Proctosigmoidoscopy, Sigmoidoscopy and Control of Hemorrhage)
  • Repair of Anal and Rectal Defects (Anoplasty, Repair of Imperforate Anus, Sphincteroplasty, Rectal Graft)
  • Repair of Rectocele With Robotic Assistance
  • Restorative Proctocolectomy With Ileal-Anal J Pouch
  • Rigid Proctosigmoidoscopy With Robotic Assistance
  • Rigid Sigmoidoscopy
  • Secondary Malignancies
  • Sigmoid Colectomy
  • Sigmoidoscopy
  • Skin Lesion Removal
  • Small Bowel Surgery
  • Snare Polypectomy
  • Sphincterotomy
  • Surgery, Robotic Assisted
  • Surgical Procedures
  • Tumor Resection
  • Ulcer
  • Ulcerative Colitis
  • Ulcerative Proctosigmoiditis

Help Improve Healthgrades

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Offer telehealth services or virtual visits?

Offer evening visits?

Communicate via email?

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Dr. Casillas' Reviews

Likelihood to recommend Dr. Casillas

4.6

Based on 29 ratings

5 Stars
86.20689655172414%
(25)
4 Stars
0%
(0)
3 Stars
3.4482758620689653%
(1)
2 Stars
3.4482758620689653%
(1)
1 Star
6.896551724137931%
(2)
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Fantastic doctor, Explains everything in detail and asks is you have questions and he listens to you.
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Mar 29, 2019
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Dr. Casillas took over practice of Dr. Julio Solla whom I used for 15 years. Dr. Casillas is incredibly thorough, very "patient sensitive" and is another one of the exceptional bright Stars at UT Medical. It takes a very special physican to practice in the Colon / Rectal arena, he's tops. Had a recent colonoscopy, he was very thorough with diagnosis to find diverticulitis, discussed treatment options, etc. Engages and listens to patient very well. Highly recommend.
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Robert in Knoxville, TN – Mar 08, 2019
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Dr. Camilla’s is an expert in his field of medicine. He is through in his exam, explanations. He has a great bedside manner. My surgery had a very good outcome. I’m glad he was my doctor.
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Adrienne in Maryville, TN – Apr 11, 2018
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This doctor is very professional and caring. Did my surgery 6 days ago and so far it looks like he did a great job. Very recommend him to others. ??????
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Katusha in Sevierville – Apr 10, 2018
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About Me

Care Philosophy

UTcolorectal.org We provide the full spectrum of colorectal surgical care but our services extend beyond the operating room. We pledge to treat you with dignity and respect, to communicate with you clearly and honestly, to protect your confidentiality, and to earn your trust.

Specialties

  • Colorectal Surgery

Board Certifications

  • Colon & Rectal Surgery
  • General Surgery

Education

2012
Indiana School Of Medicine-Colon & Rectal Surgery Residency
Fellowship Hospital
2011
St. Joseph Mercy Hospital-General Surgery Residency
Residency Hospital
2007
Brown University
Internship Hospital
2006
University of Alabama At Birmingham
Medical School
2000
University of Alabama
Undergraduate School

Awards

Common Questions and Answers

  • Does Dr. Casillas communicate via email?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)
  • Does Dr. Casillas offer telehealth services or virtual visits?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)
  • Does Dr. Casillas offer an online patient portal?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)
  • Does Dr. Casillas have free onsite parking?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)
  • Does Dr. Casillas offer weekend visits?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)
  • Does Dr. Casillas offer evening visits?

    No responses yet. What's your ?

    Yes
    (0)
    No
    (0)

Please call the office to learn more. (865) 305-5335

Frequently Asked Questions

Is Dr. Mark Casillas, MD accepting new patients?

Does Dr. Mark Casillas, MD accept my insurance?

What are Dr. Mark Casillas, MD's top areas of care?

Locations

University Colon and Rectal Surgery

University Colon and Rectal Surgery1934 Alcoa Hwy Ste D370 Knoxville, TN 37920
1

Affiliated Hospitals

Check the quality of care at hospitals where Dr. Casillas treats patients.

Learn more

University of Tennessee Medical Center

Knoxville, TN

76% Patient experience rating, 7% higher than the national average

  • America's 250 Best Hospitals Award™ (2020)
  • Patient Safety Excellence Award™ (2020)
  • Outstanding Patient Experience Award™ (2018)