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Mark Hanna,

M.D.

Colorectal Surgeon

4.8 (177 Ratings)
Biography photo
Location
Corona
320 West 6th Street
Corona, CA 92882
Specialties
Colon and Rectal Surgery
Education
Medical school:

Board Certifications

  • 11/2017–present, American Board of Surgeons
  • 9/2019–present, American Board of Colon and Rectal Surgeons
  • 8/2019–8/2021, Advanced Cardiovascular Life Support
  • 3/2015–3/2019, Advanced Trauma Life Support

Degrees

  • 2009, Doctor of Medicine, American University of Beirut Medical School, Beirut, Lebanon
  • 2005, Bachelor of Sciences, American University of Beirut Medical School, Beirut, Lebanon

Fellowship

  • 2017–2018, Fellowship, Colon & Rectal Surgery, New York Presbyterian — Weill Cornell Medical Center/Columbia Medical Center/Memorial Sloan Kettering Cancer Center, New York, New York
  • 2014–2015, Research Fellowship, Colon & Rectal Surgery
  • 2009–2010, Research Fellowship, Hepatobiliary Surgery, University of California Irvine Medical Center, Orange, California

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

Internship

  • 2010–2011, Internship, General Surgery, University of Maryland Medical Center, Baltimore, Maryland

Professional Experience

  • 2024–present, Assistant Clinical Professor, Division of Colorectal Surgery, Department of Surgery, City of Hope Orange County; Irvine, California
  • 2020–present, Assistant Clinical Professor, Division of Colorectal Surgery, Department of Surgery, City of Hope, Corona and Upland, California
  • 2018–2020, Assistant Clinical Professor, Division of Surgical Oncology, Department of Surgery, City of Hope, Upland, California
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®® Cancer Center Duarte, 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.
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."
May 20, 2025
5.0
"Excellent staff and Dr Mark Hannah Excellent!"
Apr 29, 2025
5.0
"City of Hope is the best!!"
Apr 14, 2025
5.0
"Good experience"
Apr 14, 2025
5.0
"Good experience"
Apr 12, 2025
5.0
"Dr Hannah is a terrific Dr. Possessing incredible bedside manner, compassion and concern with such sensitive topic where the patient feels scared and vulnerable"
Apr 12, 2025
5.0
"Muy bien"
Apr 12, 2025
5.0
"Buena experiencia el doctor me contesto todas mis preguntas y es muy amable tambi?n"
Apr 5, 2025
5.0
"GOOD"
Apr 5, 2025
5.0
"GOOD"
Feb 17, 2025
5.0
"Good experience"
Feb 17, 2025
5.0
"A good experience"
Jan 16, 2025
3.5
"Dr. Hanna said he was prescribing me several medications and would send it to my pharmacy. He told me this during my appointment on [...] It was never done. [...] I am VERY unhappy and so far extremely disappointed in my medical care regarding this situation."
Nov 6, 2024
4.4
"Good"
Nov 6, 2024
4.4
"Good"
Oct 22, 2024
5.0
"With it being my first contact with this provider, I'd say it was overall a very good experience!"
Oct 22, 2024
5.0
"Overall very good experience!"
Oct 5, 2024
5.0
"I recommend COH to everyone Thank you"
Oct 5, 2024
5.0
"It's been great experience Thank you COH"
Aug 26, 2024
3.7
"I WAS HOPING FOR SOME ANSWERS. HE EXPLAINED HE THOUGHT SOMETHING ELSE WAS HAPPENING AND ORDERED MORE TESTS (BLOOD TEST, COLONOSCOPY, CT SCAN). [...]"
Aug 6, 2024
4.7
"My experience was very good thank God that my procedures were excellent and thanks to the ..... Dr Hannah for his professionalism"
Aug 6, 2024
4.7
"In City of Hope my experience has continued to be very special, excellent.... etc etc"