Dr. John Sun, MD

Dr. John Sun, MD

Colon & Rectal Surgery  |  
Male  |  
Age 61
Insurances AcceptedSave
Dr. John Sun, MD is a colon & rectal surgery doctor who practices in Parker, CO. He is 61 years old and has been practicing for 27 years.

9397 Crown Crest Blvd Ste 201

Parker, CO 80138

Contact Information

Insurance Accepted

  • Aetna
  • Anthem Blue Cross Blue Shield
  • Blue Cross Blue Shield
  • Cigna
  • First Health (Coventry Health Care)
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. Sun

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you

Top Care Areas


See how frequently Dr. Sun performs your care needs compared to other doctors.

Anal Fissure
very high
more than 95% of peers
Abdominal Disorders
very high
more than 95% of peers
Gastrointestinal Diseases
very high
more than 95% of peers

Dr. Sun's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

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  • Colon & Rectal Surgery

Board Certifications

  • Colon & Rectal Surgery
    Accredited by: American Board of Medical Specialties*
  • General Surgery
    Accredited by: American Board of Medical Specialties*

Conditions Treated

  • Abdominal Disorders
  • Abscess
  • Anal Disorders
  • Anal Fissure
  • Anal Fistula
  • Anal Prolapse
  • Anal and Rectal Cancer
  • Anal or Rectal Pain
  • Anorectal Abscess
  • Cancer
  • Carcinoma in Situ
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Gastrointestinal Diseases
  • Hemorrhoids
  • Inflammatory Bowel Disease
  • Intestinal Abscess
  • Intestinal Obstruction
  • Meckel's Diverticulum
  • Rectovaginal Fistula
  • Secondary Malignancies
  • Ulcer
  • Ulcerative Colitis


  • Abscess or Cyst Drainage or Aspiration
  • Abscess or Fluid Incision and Drainage
  • Anoscopy With Removal of Anal Tumor
  • Appendectomy, Laparoscopic
  • Appendectomy, Open
  • Colectomy
  • Colon and Rectal Surgery
  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Dressing and-or Debridement of Wound, Infection, or Burn (incl. Negative Pressure Wound Therapy)
  • Enterostomy (Laparoscopic or Open)
  • Fistulectomy or Fistulotomy, Anal
  • Gastroenterology Procedures
  • Hemorrhoidectomy or Excision of Anal Tags
  • Hernia Repair
  • Intestinal Transplant (incl. Enterectomy)
  • Laparoscopic Surgical Procedure
  • Laparotomy
  • Open Incisional and-or Ventral Hernia Repair
  • Proctectomy, Open or Laparoscopic (incl. Swenson and Duhamel Procedures)
  • 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)
  • Sphincterotomy

Background Check

0 Malpractice Claims

No malpractice history found for Colorado.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • University Of Colorado
    Medical School | Graduated 1990
  • University CO
    Internship Hospital | Completed 1991
  • University Of Colorado
    Residency Hospital | Completed
  • University Of Minnesota Hospitals and Clinics
    Fellowship Hospital | Completed

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Sun has no media or publications listed.

Languages Spoken

  • English
  • Korean

Memberships & Professional Affiliations

Dr. Sun does not have any memberships or affiliations listed. If you are Dr. Sun and would like to add memberships or affiliations, please update your profile.

Dr. Sun's Reviews

Likelihood of recommending Dr. Sun to family and friends
based on 45 total reviews (13 with comments)
Dr. Sun's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    10 to 15 minutes
Patient Comments (13)
in Denver, CO |
Although i am in healthcare & think people reviewing Dr's online is absurd, I'm going to play the game because Dr. Sun is THAT important to me.I was referred to Dr. Sun in an emergency scenario after delivering my baby.My OB asked a favor that he come by the ER to see me.It was late, he had changed out of scrubs & was heading home, but he accepted the favor & saw me.He Helped me through 5 surgeries, an Ileostomy at 30 yrs old, 6months of HeLL. I cry when i think of him because he changed my life
in Aurora, CO |
I was referred to Dr. Sun for a surgical solution for chronic diverticulitis. I just finished (11 days ago) the 2nd of 2 surgeries (8 weeks apart) to remove about a foot of my sigmoid colon. Dr Sun is a highly skilled, careful and attentive surgeon. He took the time to carefully explain my condition, why surgery was the best option, how the surgery would be performed (in detail) and willingly answered any questions I had about the process. Post surgery, he carefully followed my progress.
in Strasburg, CO |
Dr. Sun is an outstanding surgeon. My condition required an initial surgery and two followup biopsies. I experienced very little pain as Dr. Sun is very good with pain management. Dr Sun is easy to talk with and shows concern for his patients. I would recommend him to family or friends if they needed surgery.
in Kiowa, CO |
The best Dr and surgeon. Listens to the patient plus takes his time explaining procedures with ease.
in Aurora, CO |
Clear, to the point, friendly, excellent surgeon. I had an excellent experience with Dr. Sun and his staff. I will visit again and recommend his office to others.
in Elizabeth, CO |
Attitude, patient approach, straight-shooter. All qualities I look for in an expert.
in Denver |
Thank you, Dr. Sun for fixing my medical issues with grace, knowledge, expertise and wisdom. The "end" result was "endcredible"!
in Littleton, CO |
The miracle worker of my life. I love Dr. Sun and he saved my life! So knowledgeable; so friendly; so nurturing. You could not ask for anymore from a surgeon!
in Denver, CO |
In 2006 I was a 53 year old woman who was experiencing prolapse and poor function of the rectum. Dr Sun and Dr Aguirre reconstructed the prolapsed parts in the rectum and vaginal areas. I was terrified of pain potential and discomfort, but was pleased that this was managed very well. The surgery was a great success and 10 years later I am in very good condition.
in Parker, CO |
Excellent experience. Face it rectal surgery is not fun and it is embarrassing, but Dr. Sun and his staff really take good care of you and takes the awkwardness out of the situation. His work is excellent and he uses the latest pain management (exparel) that keeps you pain free during the 3 days following surgery. Normally post op pain is excruciating. All the way around, if you need hemorrhoid surgery, Dr Sun should be your first choice.
in South Fork, CO |
We carefully researched for a doctor who had knowledge of and experience operating on pilonidal cysts for our 19 year old son. Dr. Sun was very knowledgeable and experienced with pilonidal disease. He spent time explaining what was going on and how he would operate (doing a modified Bascom procedure) prior to the surgery. We are almost a month post op and have absolutely nothing but positive things to say about Dr. Sun and the procedure. We highly recommend Dr. Sun and his staff.
in Aurora, CO |
After procrastinating for way too long, I finally decided to get a colonoscopy. My Primary Care Physician recommended Dr. Sun and I'm so glad he did! Not only was Dr Sun very personable, his staff was wonderful. Their recommended method for prep (colon cleanse) was actually far easier than I expected. Dr. Sun and his team were very good to answer all my questions, and the process was a piece of cake!
in Parker, CO |
Been a patient of Dr. Sun for the past couple of years and couldn't be happier. Not only is he friendly and generous with his time, he is a consummate professional. After my most recent colonoscopy, he identified a concerning adenoma and provided me with a range of options. Understanding my immediate reaction, he calmly and clearly explained the risks and opportunities for a favorable outcome. I followed up with Dr. Sun to have laparoscopic surgery to remove my appendix. Thanks Dr. Sun!
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Now Accepting New Patients
Dr. Sun accepts 6 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
    Whole Health Colorado Front Range
  • Anthem Blue Cross Blue Shield
    Anthem Blue Cross Blue Shield PPO
  • Blue Cross Blue Shield
    Blue Card PPO
  • Cigna
    Cigna HMO
    Cigna PPO
    Open Access Plus
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • MultiPlan
    MultiPlan PPO

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Sun has admitting privileges

Parker Adventist Hospital
9395 Crown Crest Blvd
Parker, CO 80138
View Hospital Profile
Rose Medical Center
4567 E 9th Ave
Denver, CO 80220
View Hospital Profile