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

4.8 out of 5 (655 Ratings, 272 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.

Read more


  • English

Memberships and associations

  • Fellow, American College of Surgeons

Patient Ratings

4.8 out of 5 (655 Ratings, 272 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

  • Dec 21, 2019

    The Doctor and his team right from the start made me feel comfortable because they were polite and professional.

  • Dec 21, 2019

    Kind and Great at what they do! Thank you!

  • Dec 20, 2019


  • Dec 18, 2019

    Dr. Herzig, was, as always, both personable and professional. He answered throughly questions relating to my upcoming surgery and indulged my curiosity of medicine in general. As a rather anxiety ridden person and patient, I found his warm demeanor and uplifting smile comforting. This was an excellent pre op meeting.

  • Dec 17, 2019

    excellent. made me feel comfortable. have had past experience, which was also excellent.

  • Dec 17, 2019

    Dr Herzig is very knowledgeable and was the most helpful Dr I’ve met with about my genetic condition.

  • Dec 17, 2019

    I was very pleased with the treatment I got with. Dr. Herzig or Herzig or however you pronounce it got more done and just a very short time up there with him that I've had done and a month and a half with the surgeon. I was seeing and Eugene. I'll definitely be. Talking very highly Dr. Herzig.

  • Dec 16, 2019

    Dr. Herzig was wonderful, professional, and thorough. And it was great being able to see him and we're lucky to have physician and Oregon at OHSU is a resource like he is. Thank you, Dr. Herzig.

  • Dec 13, 2019

    I was surprised at how easy and quick it was to complete my appointment. I arrived a half hour early and went to the coffee shop to reread all the instructions I was sent. Complimentary coffee was nice. Every time I looked like I needed help or lost, there was someone there for assistance.I was prepared to sit in a waiting room for a while but was in to see the Dr ON TIME.It felt like everyone was there for me.Thank you for making my visit a pleasure.

  • Dec 13, 2019

    Great DrPatient and empathetic, explained everything clearly. Great manner

  • Dec 13, 2019

    Hi. Dr. Herzig is excellent. Not only as a surgeon and a medical doctor, but just as a person he makes you feel very comfortable, and answers any questions that you have and tries to do it was a little bit of humor, which I appreciate. Thank you.

  • Dec 11, 2019

    Dr Herzig has a calm likeable nature. He takes his time explaining test results.

  • Dec 11, 2019

    The provider is great and makes me feel confident in his decisions and how he explains things.

  • Dec 11, 2019


  • Dec 09, 2019

    My experience was very good from the start when I entered the facility and everyone was very helpful the nurses and the assistant everything was explained to me and everyone was just positive and calm and patient with me when I asked questions ans so then going into the the operating room the surgery room and meeting the doctor. He was very personable and explained a few things to me. I didn't spend a lot of time with him, but I he was had a very pleasant manner and I was confident before I went under the*.

  • Dec 07, 2019

    Everyone was so kind and professional.

  • Dec 07, 2019

    Excellent listener.

  • Dec 06, 2019

    Dr. Herzig explains things very well. He is a good listener

  • Dec 06, 2019

    I had a very good experience. Doctor Herzig had some good ideas to help end my problem.

  • Dec 06, 2019

    Good connection with patient. Listened. Explained procedure and results. Asked if patient had questions.

  • Dec 03, 2019

    Dr Herzig is clear and concise and uses laymens terms to explain what's happening and comforted us with support. Our experience with Dr Herzig was above board.

  • Nov 22, 2019

    Always good natured. Gives lots of time and good explanations.

  • Nov 22, 2019

    Everything went very well. I felt well taken care of and the staff were all very kind and professional. I’m very happy with the treatment plan that Dr. Herzig outlined. I am so thankful for him and his team!

  • Nov 21, 2019

    Dr.Daniel Herzig is the ultimate professional! I am in awe of his expertise and close personal relationships with his patients...I probably wouldn't be alive today without this precious Doctor!

  • Nov 21, 2019

    Hey was absolutely incredible. I he talked to us on a level that we could understand. He explain things and I think he is absolutely awesome.

  • Nov 20, 2019

    good on time

  • Nov 15, 2019

    Oh wait, that's you is one of the most caring most expert places I've ever been I recommended to everybody.

  • Nov 08, 2019

    Very pleasant and efficient.

  • Nov 06, 2019

    I waited 30 minutes for Dan, I didn’t have enough tine to get all my questions answered. I will have to follow up with an email. I’m pretty sure it was busy but I left feeling confused as to what was going on with my treatment.

  • Nov 03, 2019

    Professional, personable and knowledgeable describes him. His staff was excellent as well.

  • Nov 03, 2019

    Evrything was great

  • Nov 02, 2019

    He was warm and professional. I trusted him even though I didn't know him.

  • Nov 02, 2019

    Nice guy - he's done my scope before - knew my story - straight to the point

  • Nov 01, 2019

    Dr. Herzig was personable, direct, informative and reassuring. Felt much more comfortable about facing a rather complex surgery in February.

  • Oct 28, 2019


  • Oct 26, 2019

    I received very good care during my colonoscopy. All staff provided excellent care and were very professional.

  • Oct 26, 2019

    Everyone was helpful and both appointments were handled by caring people.They were on time and very professional.

  • Oct 25, 2019

    Dr. Herzig is very dedicated, caring, and skilled. I highly recommend him.7

  • Oct 25, 2019

    Prompt, knowledgeable, professional and caring. They got me in and out within a timely manner. Was dedicated to my care and making sure I had the proper information when I left. Would definitely recommend OHSU.

  • Oct 23, 2019

    Dr. Herzig and his staff are wonderful. Great health care, kind, courteous, professional and knowledgable. An unbeatable combination with the fine facilities of OHSU

  • Oct 20, 2019

    He explained things and was very good at answering questions

  • Oct 20, 2019

    Hi my experience with Dr. Herzig was excellent. He was very personable. Very explanatory, very Concerned, everything you would want your doctor to be and explained everything in a way we can understand it. So. I would recommend him highly.

  • 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 18, 2019

    My visit with him was pretty good, and he went into detail about - and explained some stuff to me that the doctors at the hospital didn't, and now they're going to be looking at something else inside of me that I had no clue about so I'm glad to hear about that part of it. So all in all, I thought the visit was excellent.

  • 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

    Dr. Herzig is a compassionate, kind, and knowledgeable provider, who provides comfort in an otherwise awkward situation and it was so very much appreciated.

  • 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.