Daniel O. Herzig M.D., F.A.C.S., F.A.S.C.R.S.

Photo of Daniel O. Herzig, M.D., F.A.C.S., F.A.S.C.R.S.
Faculty profile
  • Associate professor of surgery

Associate Professor of Surgery, Division of Gastrointestinal and General Surgery School of Medicine

Accepting new patients

4.9 out of 5 (329 Ratings, 78 Comments)


  • Cancer
  • Digestive Health
  • Surgery

Special focus on

  • Anal Cancer
  • Colorectal Cancer
  • Digestive Surgery
  • Gastrointestinal Cancer
  • General Surgery


  • M.D., Vanderbilt University School of Medicine, Nashville Tennessee 1999
  • Residency:

    • General Surgery, Brown University/Rhode Island Hospital, Providence, RI  1999-2004
  • Fellowship:

    • Colorectal Surgery, University of Texas Health Science Center at Houston, Houston, TX, 2004-2005
  • Certifications:

    • American Board of Surgery, 2005
    • Colon and Rectal Surgery, 2006


Dr. Herzig specializes in the surgical treatment of colon and rectal diseases. He earned his medical degree from Vanderbilt University and completed his surgical residency at Brown Medical School. At Brown, he won over a dozen awards for excellence in teaching, patient care, and research, including the Outstanding Resident Physician award in his last year. He went on to complete advanced training in colon and rectal surgery, including minimally invasive surgery and endoscopy at the University of Texas, Houston. Dr. Herzig is board certified in surgery and colon and rectal surgery.

Dr. Herzig joined the faculty at OHSU in 2005. He is part of the OHSU Digestive Health Center and the OHSU Knight Cancer Institute. He specializes in the treatment of both cancerous and noncancerous diseases of the colon and rectum. Dr. Herzig is committed to providing the highest quality personal service to each individual. Because of this, he has been recognized as one of “Portland’s Top Doctors" and has been named as one of "America’s Top Surgeons.”

Cancerous diseases include colon, rectal, and anal cancer. These are potentially curable cancers for many, if not most people who are affected. Individualized care is provided for each person. Whether as an initial visit, or as a second opinion after seeing another provider, Dr. Herzig will make sure each person understands their disease and all treatment options. While surgery remains the cornerstone of curing colorectal cancer, colorectal cancer care at OHSU comes from a team of people to address the complex nature of this problem, including of some of the country’s best physicians in this field. In our multidisciplinary clinic, we bring together all of the experts needed in one place at one time. Patients can see their surgeon, as well as an oncologist, nutritionist, geneticist, or radiation specialist all in one visit. Care is coordinated so that each individual receives the optimal, state-of-the-art approach. Clinical trials are available, if desired, for many patients with colorectal cancer.

Noncancerous (benign) diseases include the treatment of hemorrhoids, anal fissures, anal fistulae, diverticulitis, and rectal prolapse. In the treatment of benign diseases, Dr. Herzig treats each patient individually, working together to find the appropriate treatment for each person’s symptoms. This can often be done with non-operative and office treatments.

Dr. Herzig’s research interests include colorectal surgery outcomes and hereditary colorectal cancer syndromes. He started the state’s first colorectal cancer registry and has collaborated with other researchers at OHSU to continue this institution’s leadership in colorectal cancer research.

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  • English

Memberships and associations

  • Fellow, American College of Surgeons

Clinical Trials

The following clinical trials are currently accepting new participants:

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Patient Ratings

4.9 out of 5 (329 Ratings, 78 Comments)

The patient ratings score is an average of all responses to the question "How likely would you be to recommend this provider to your family and friends (on a scale of 0 to 10)" on our nationally-recognized NRC patient surveys.

Patient Comments

  • Nov 15, 2018

    Dr. Herzig has been quite lovely and wonderful since I have been working with over a year ago. I felt bad for him because he had to give me potentially bad news on my last visit and I suspect that was not easy to do.

  • Nov 14, 2018

    I can depend in Dr. Herzig's experience and recommendations, and that was the case in this visit.

  • Nov 05, 2018

    Most people are very embarrassed about dealing with a colo-rectal problem. Dr Herzig had made it easy and comfortable about discussing my issues. We laugh a lot, too. I feel he has affection for me as a patient.

  • Nov 03, 2018

    A compassionate, knowledgable and professional doctor. Was thorough in his responses to my many questions and concerns. I only wish he were my local doctor!

  • Nov 02, 2018

    Hi. After my visit with Dan, I have to say that as a retired ICU nurse, I thought that Dan was very professional, very knowledgeable, and I would highly....and just personal. I would highly recommend him as a gastroenterologist, surgical or otherwise, for anybody.

  • Nov 01, 2018

    Dr Herzig cares for his patients, takes time with each and working toward the best for the patient health.

  • Nov 01, 2018

    I?m very thankful that Dr. Herzig was one of my doctors, the professionalism he showed me in answering questions and the call backs from the staff to check to see how was doing was awesome!!!!!!

  • Nov 01, 2018

    Dr. Herzig is personable and engaging with a good sense of humor. His medical knowledge and care are exemplary. It is worth noting that OHSU staff, both in his office and at the hospital, give him high marks for being an excellent surgeon?the word "brilliant" was used more that once?and for being great to work with.

  • Nov 01, 2018

    Dr. Herzig is great. I would recommend him to anyone needing Digestive Health.

  • Oct 31, 2018

    Dr Herzig put us at ease and answered all of our questions and worked hard to get my surgery scheduled right away. His staff/team are very pleasant to work with and have been very accessible. I?m feeling well cared for.

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