(888) 552-6760 SCHEDULE AN APPOINTMENT

Mark Hanna,

M.D.

Colorectal Surgeon

4.8 (204 Ratings)
Biography photo
Location
City of Hope Orange County Lennar Foundation Cancer Center
1000 Five Point
Irvine, CA 92618
City of Hope Seacliff
2100 Main Street #300
Huntington Beach, CA 92648
Specialties
Colon and Rectal Surgery
Education
Medical school:
  • 2009, Doctor of Medicine, American University of Beirut Medical School, Beirut, Lebanon
  • 2005, Bachelor of Sciences, American University of Beirut Medical School, Beirut, Lebanon
Residency:
  • 2015–2017, Resident, General Surgery, New York Presbyterian — Weill Cornell Medical Center/Columbia Medical Center/Memorial Sloan Kettering Cancer Center, New York, New York
  • 2011–2014, Resident, General Surgery
Academic Appointments
  • Assistant Clinical Professor, Division of Colorectal Surgery, Department of Surgery
About Me

“I joined City of Hope because I deeply connect with its commitment to delivering cutting-edge cancer treatment with empathy and heart.” 

For Mark Hanna, M.D., assistant professor of colorectal surgery at City of Hope®, trust is at the core of his work. He was drawn to surgery because of the unique and powerful bond formed with patients. “There’s something profound about earning a patient’s trust and using your hands to help them heal—that’s a privilege I don’t take lightly,” he says. 

Dr. Hanna specializes in minimally invasive and robotic techniques for colorectal cancer and is dedicated to providing advanced surgical options that help patients recover more quickly, experience less pain and spend less time in the hospital. 

He earned his medical degree from the American University of Beirut Medical School, completed an internship at the University of Maryland Medical Center in Baltimore and pursued his residency at the University of California, Irvine. He later completed a prestigious colon and rectal surgery fellowship through a combined program at New York Presbyterian-Weill Cornell and Columbia University Medical Centers, as well as Memorial Sloan Kettering Cancer Center, all in New York City.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Mar 10, 2026
5.0
"Dr Hannah is very knowledgeable and professional."
Mar 7, 2026
5.0
"Dr Hannah is a wonderful doctor explains so you understand but never scares you with tons of things that could go wrong"
Mar 4, 2026
5.0
"Great staff very attentive"
Mar 4, 2026
5.0
"Dr. Hannah gave me all the time I needed to address all my concerns. I left feeling much better"
Feb 28, 2026
5.0
"My Dr.was a very good listener, he was very knowledgeable,very understanding. I explained how I wasn't able express my feelings. But he literally listened and gave me the best advice. I'm glad I came to my appointment"
Feb 27, 2026
5.0
"Dr. Hannah is exceptional and amazing!"
Feb 16, 2026
5.0
"Dr Hannah very good"
Feb 10, 2026
4.4
"Staff let me keep my dignity"
Jan 26, 2026
5.0
"Highly recommended"
Jan 26, 2026
5.0
"All very well thank you good attentions"
Jan 24, 2026
4.4
"My only note is that I tried to discuss a rash I have that's a reaction to creams I'm using and it was dismissed and never addressed. The actual hemorrhoids and treatment, I'm above satisfied with the care, listening, and treatment I was given."
Jan 23, 2026
4.4
"He didn't fix anything nor did the prescriptions go through. Not sure why I bothered. He seems like a very good doctor [...]"
Jan 21, 2026
4.3
"Very good and amazing service."
Jan 21, 2026
4.3
"Kind of rushed and hurried, but he did do a check up and tell me my problems gone. But wish he could have made sure I was sure because he rushed out and I asked the nurse to completely make sure and she said yes my problem is gone."
Jan 17, 2026
4.7
"Overall, my experience was very good-from [...], who checked me in, to [...], who brought us to the room, and Dr. Hannah. [...]"
Jan 17, 2026
4.7
"Initial diagnosis appointment with the the provider was reassuring. He was caring, compassionate, and provided a sense of hope by explaining that colon cancer is very treatable. I Left the visit feeling supported and more at ease."
Jan 10, 2026
4.7
"Routine 6 month follow up to surgery. Everything was most efficient and nothing to really discuss"
Jan 10, 2026
4.7
"City of Hope is just an amazing place feel fully protected at every phase of my care wit all the different doctors and staff I come in contact with from the front desk; labs to everyone on the third floor!"
Jan 4, 2026
5.0
"Wonderful caring City of Hope [...]. Very professional."
Jan 4, 2026
5.0
"I am grateful to Dr Mark Hannah and his staff for the excellent care I received during my visit."
Jan 3, 2026
5.0
"I highly recommend Dr Hannah. I am in good hands"
Dec 18, 2025
5.0
"Excellent service and friendliness"
Dec 18, 2025
5.0
"Very satisfied with your help"
Oct 29, 2025
5.0
"Dr Hannah made me feel very comfortable and relaxed. I truly appreciate his time and everything about him. I hope (really really hope).he stays at COH Irvine. He gets a 5 star rating from me."
Oct 18, 2025
5.0
"Dr was patient, gave me all the necessary info, and the options available."
Oct 16, 2025
5.0
"Dr Hannah was the absolute caring doctor! Explained to me what I needed to have done & I could actually understand him!!!"
Sep 16, 2025
5.0
"Good experience"
Sep 16, 2025
5.0
"Good experience"
Sep 10, 2025
5.0
"All good experience!"
Sep 7, 2025
4.0
"Physician was knowledgeable but seemed distracted and busy and I was just another patient he was polite but seemed uninterested ."
Jul 23, 2025
5.0
"So kind, respectful and made me feel human and not a number like some doctors [...]"
Jul 23, 2025
5.0
"Dr. Hannah was amazing, professional and I can tell he is an expert in his field and really listened to me and was patient as I was a little nervous at times getting my words out but very kind, respectful and didn't make me feel ashamed of my issues, rather, explained in ways of what's happening that I can understand and listened to my questions. He was wonderful and made me feel comfortable, so I am really glad to have him as my new Dr!"
Jun 14, 2025
5.0
"Good experience"
Jun 14, 2025
5.0
"Good experience"
Jun 7, 2025
5.0
"Dr. Hannah is not only a very skilled surgeon, he takes time to listen to and answer questions and explain everything clearly."
Jun 7, 2025
5.0
"Good"
Jun 7, 2025
5.0
"Good"
May 22, 2025
4.4
"I have been dealing with this problem since [...] seen 7 different Dr's general surgeons, Gastroenterologist, Pa's, primary physician and until I seen Dr. Hannah I had been very disappointed [...] no one has helped me till I was finally referred to Dr. Hannah. I feel relief mentally and am Happy he is going to help me with my medical situation."