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
  • Professor of Surgery

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

Accepting new patients

4.9 out of 5 (619 Ratings, 236 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

Patient Ratings

4.9 out of 5 (619 Ratings, 236 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

  • Oct 20, 2019

    He explained things and was very good at answering questions

  • Oct 18, 2019

    excellent doctor with great patient considerations

  • Oct 18, 2019

    Dr. Herzig is an excellent, knowledgeable, experienced and personable provider. Feel very lucky to have such a great professional as a provider.

  • Oct 15, 2019

    the staff and doctors are all very professional without being cold. I was treated with dignity and respect.

  • Oct 14, 2019

    Dr Herzig explained procedure and asked good questions. Good beside manors.

  • Oct 14, 2019

    The doctor was very professional. Answered all our questions and I was very pleased with my experience.

  • Oct 13, 2019

    Dr. Herzig is a kind, warm, thoughtful, knowledgable, comprehensive, caring, skilled provider.

  • Sep 21, 2019

    Everything was accomplished in a professional, efficient and timely manner.

  • Sep 18, 2019

    Dr. Herzig is very communicative and informative. He takes the time to answer all my questions and concerns.

  • Sep 18, 2019

    Dr's Herzing and Kim were very friendly and professional. They answered all my questions in a genuine and caring manner.

  • Sep 15, 2019


  • Sep 13, 2019

    Dr. Herzig is the embodiment of the doctor everyone wants: skilled, compassionate, personable and supportive. I can’t imagine better care.

  • Sep 10, 2019

    Experience was great, thank you!

  • Sep 09, 2019

    Very nice, informative, answer all the questions,

  • Sep 08, 2019

    Warm, friendly, relaxed, gave full and complete explanation of procedure and open to all questions, gave understandable answers.

  • Sep 07, 2019

    Dr Herzig was very warm and communicated well about the procedure and results

  • Sep 06, 2019

    Doctor Herzig is everything of position should be, caring and personal and thorough.

  • Aug 29, 2019

    Dr. Herzig always makes my visits comfortable. It's rare for me to have a trust in doctors but with him he makes easy.

  • Aug 14, 2019

    great bedside manner; he explained everything very well and didn't make me feel embarrassed for working on my butt!!

  • Aug 10, 2019

    Dr. Herzig is a wonderful and caring doctor. During my appointment with him I feel extremely comfortable and relaxed. He always answers my questions completely and in a manner easy for me to understand, and I never feel rushed.

  • Aug 09, 2019

    Excellent service, very thorough in his presentation of information. Very easy to work with and willing to hear all kinds of questions.

  • Aug 02, 2019

    He is the best. Highly skilled. Very respectful.

  • Aug 02, 2019

    Everything at OHSU always goes so smoothly, from the check-in to release.I absolutely love Dr. Herzig. He is a wonderful doctor. Extremely knowledgeable, kind and informative. I feel very lucky to have Dr. Herzig as my doctor. I would give hime 20 stars if I could.Roxanne

  • Aug 02, 2019

    Considering all the comments from others about "how much fun" it is to undergo a colonoscopy. Having my first procedure at 65 could not have gone any better. I had all the information I needed to be ready when the time came and Dr. Herzig and the entire staff could not have been nicer, more professional, or made the whole experience any easier. Definitely better than I could have imagined!

  • Aug 02, 2019

    Dr. Herzig is terrific, a caring, knowledgable health care provider. He does something rare among doctors......he listens.

  • Jul 31, 2019

    Extremely polite and freindly

  • Jul 26, 2019

    He was quick efficient and professional. A real pleasure to have as a doctor

  • Jul 26, 2019

    Most helpful and made one feel at ease. Thank you very much.

  • Jul 20, 2019

    very attentive staff

  • Jul 20, 2019

    Great customer service. Very organized and efficient care.

  • Jul 20, 2019

    A superstar....Treats people like people should be treated. Both staff and patients. Warm, funny and compationate.A keeper...

  • Jul 19, 2019

    Dr. Herzig was able to squeeze me in and took wonderful care of me.

  • Jul 19, 2019

    Dr. Herzig is awesome. He takes his time to explain things. He doesn't rush you through. He's an awesome doctor. I've had him for about 10 years. Don'tI want to go anywhere else. Bye.

  • Jul 18, 2019

    Pre surgery appts x3.All on time and even conveniently earl arranged by staff for last appt.Highly reccommend.

  • Jul 17, 2019

    Dr Herzig has a great bedside manner, a great listener and overall great Dr.

  • Jul 17, 2019

    My experience was great. I found Dr. Herzig was very knowledgeable very well prepared, was able to access all my files and coordinate them quickly. Our discussions were good and to the point, his suggestions were helpful, and I appreciated him pushing through the necessary scans that we needed to continue with his diagnosis and prognosis. Thank you.

  • Jul 14, 2019

    Excellent experience with what I thought would be a very uncomfortable procedure (colonoscopy). I would highly recommend Dr. Herzig and his staff!

  • Jul 12, 2019

    Dr. Herzig is a great provider. He has good communication skills and was very informative regarding my health plan

  • Jul 12, 2019

    Top notch. One of my all time favorite doctors!

  • Jul 10, 2019

    Daniel Herzig is, in many ways, a doctor of a time hone by. He listen to his patient, is eminently approachable, caring, has a sense of humor, and is thoroughly professional. Having practiced medicine myself for 35 years, it was a remembrance of things past in this space age of technical medicine.

  • Jul 10, 2019

    I feel confident that Dr. Herzig probably saved my life. He got rid of the cancer, and I'm feeling really good. That's important. Thank you.

  • Jul 07, 2019

    Dr. Herzig was kind, courteous, respectful and understanding.Thank you!

  • Jul 07, 2019

    Yes, he was very, very, very polite and he did his job very well. I appreciated everything he done for me.

  • Jul 05, 2019

    Dr. Herzig was very kind to us and was very kind to our daughter who had the appointment who has special needs and went out of his way to work with her and ... and to help with her (INAUDIBLE) and explain things as he went. We are very impressed. Thank you.

  • Jun 30, 2019

    Hi, I had a colonoscopy with this doctor and I was very impressed with him and the whole unit they were very professional and also very friendly. So I felt comfortable. They offered to answer any questions that I would have, they provided me with lots of information, which I appreciated and I will definitely recommend from others in the future. Thank you so much for excellent service.

  • Jun 29, 2019

    Professional, friendly, efficient and reassuring, Dr. Herzig is terrific.

  • Jun 28, 2019

    He made me feel comfortable and at ease. That helped a lot!

  • Jun 28, 2019

    Kind, professional, competent, explained what was going on, worked well with his team, respectful to me.

  • Jun 28, 2019

    Very good service from the doctor. I feel good.

  • Jun 28, 2019

    Dr. Daniel Herzig has been the best doctor I've ever dealt with for my family and for me, but also with all my family with my kids with my husband. Any doctors that I've ever dealt with he is by far been the most professional the most the most knowledgeable the most and he extends himself after hours. He is just an outstanding doctor and I really feel blessed that I've been able to have him during such a hard time in my life and I'm just really happy with him and his whole staff. I'm just ... my experience OHSU has been nothing, but perfect for someone's having to go through such an ordeal. It's just been a *