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 (440 Ratings, 168 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 (440 Ratings, 168 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

  • May 25, 2019

    Dr. Herzig and his entire team were excellent. I felt confident in his care.

  • May 19, 2019

    Good afternoon, I am Mrs. [Name] and they asked me to rate the doctor that I wanted to tell him that the doctor was very excellent and all of them, not only the doctor, I thank him and thank you very much for the attention they gave me. I like that everyone is learning and he has a lot of interest in us as patients have treated us very well thank you very much and have a lot of success.

  • May 16, 2019

    I've been seeing Dr. (INAUDIBLE) years now and I really, really think he's a good doctor. He's attentive, he explains things to me and I really, really like him.

  • May 15, 2019

    Yes, the process was... it's very comfortable and the people were extremely nice and competent. Thank you.

  • May 13, 2019

    Dr Herzig is the best! I always feel that he cares about my health and seeks the best treatments for me. I trust his wisdom because he always explains my condition and his recommended course of care completely. I never leave an appointment wondering about the next step. I owe my current good health to him.

  • May 13, 2019

    Many years with Daniel. Love the guy.

  • May 13, 2019

    As good of an experience that I could imagine having at a hospital

  • May 03, 2019

    The medical group had moved to the location across the street. This created some confusion when I tried to check in so I was running late. When I got to the office the desk staff got me checked in quickly and got me back on schedule and when I was taken to see Dr Herzig he was there early and was ready to see me right on time. Everyone was great and Dr Herzig is probably one of the finest doctors I have ever known. I have been seeing him for many years and wouldn't let anyone else care for me. Now my wife wants him to be her physician for certain procedures we need to have as we get older. I have never had a bad experience because the staff is prepared and considerate of every patient

  • May 01, 2019

    He did not have my CT scans available to look at while I was there for 1 hour 30 minutes. He said he would call me that evening once he looked at them. So I didn't get alot out of my appt. He was very nice and very busy.

  • May 01, 2019

    Herzig and staff are pleasant, professional, and know their roles well. Herzig is professional, honest, and analytical. He needs a blue Ferrari.

  • May 01, 2019

    He has always been very kind to me and explained things to me in a way that I can understand. I am very comfortable with him. Thank you.

  • Apr 29, 2019

    My experience with Dr. Herzig is very good. I think he has given me good advise. I like him a lot

  • Apr 29, 2019

    I have found the doctor very personable. His bed side manner was a plus. The reason he did not get a 10 is because the paperwork said one thing and he verbally told me another thing, as well as my husband.

  • Apr 26, 2019

    Dr. Herzig is a thoughtful, communicative, doctor who provides knowledge and helps me, as his patient, understand and work as a team for my heath.

  • Apr 26, 2019

    Dr. Herzig has been a top notch doctor. While providing excellent care, he is patient, thoroughly explains the process of treatment, and maintains a terrific sense of humor.

  • Apr 26, 2019


  • Apr 26, 2019

    Courteous, prompt, thorough in explaining the procedure both pre- and post-op.

  • Apr 25, 2019


  • Apr 25, 2019

    People friendly and helpfull

  • Apr 24, 2019

    Dr. Herzig is an amazing doctor, super knowledgeable, kind and attentive. One of the best, if not the best I have ever met.

  • Apr 21, 2019

    Dr Herzig, and his resident were friendly and patient with my reaction to the shocking news I was receiving from them.

  • Apr 20, 2019

    The whole experience was very comforting. I really loved the nurse Lauren who placed my IV. She was very sweet and it was almost painless. Dr. Herzig was very kind and helpful.

  • Apr 19, 2019

    Dr. Herzig was professional, knowledgable, kind, had a great personality and above all was extremely helpful. He really tried to understand things from our point of view and proactively help us. We feel extremely lucky to have crossed paths.

  • Apr 17, 2019

    On time. Acknowledged he was needing to review my chart because the referral only mentioned part of my situation. He listened to my concerns.

  • Apr 14, 2019

    Very positive experience with Dr. Herzig. He listens well and explain things well.

  • Apr 14, 2019

    I found Dr. Herzig to be an excellent person aspiring to sublimity and I was very happy with the information he provided me with and everything else about his ... his demeanor and everything. That's all.

  • Apr 13, 2019

    Dr. Herzig provides a very comfortable patient experience with a great balance of talking through the topics while keeping the mood light and stressless. During the procedure he was careful to check if there was any discomfort or issues and talk through next steps. He made a traditionally uncomfortable topic very tolerable... can’t really say pleasant, but that wasn’t his issue, it was purely what was being done. Sincerest of compliments go out to him.

  • Apr 13, 2019

    Nice folks.

  • Apr 13, 2019

    Dr. Herzig was very polite, very straightforward factual. Very good really appreciate how he communicates with people and excellent service.

  • Apr 12, 2019

    A wonderful experience, I was able to talk about health details that were embarrassing and Dr. Herzig put me at ease. He was able to provide me the care I needed.

  • Apr 12, 2019

    Everybody is very friendly and professional. Always asking if you need water or blanket. Exceptional 1st class 5 Star Service that I very much appreciated .

  • Apr 11, 2019

    He is really good, the most knowledgeable and has a national reputation

  • Apr 11, 2019

    I really respect Dr. Herzig for advising against surgery until we have a definite diagnosis. I'm frustrated that it's taking so long to figure out, but I trust him.

  • Apr 11, 2019

    Friendly, knowledgeable, listens well.

  • Apr 08, 2019

    He’s great. Explains things easily. Takes time to do so. Takes time to discuss all options.

  • Apr 06, 2019

    Good sense of humor, knowledgeable and had time to explain options to me

  • Apr 06, 2019

    Well, it's the first time Dr. Daniel Herzeg did surgery on me, I've seen good comments about him, the surgery or procedure was very good and now I'm waiting on my recovery to have a better answer about your services.

  • Apr 05, 2019

    Dr. Herzig treated myself and my wife very professionally. He was very open as to what the procedures were and what the risks were. He explained everything to the ... so that we had no questions. He was very thorough. He was very polite, very professional. He had a great persona around him. Not at all stressful to go see him and I would recommend him to anyone.

  • Apr 05, 2019

    I have nothing but good things to say about the wonderful Dr. Herzig. He’s walked with me and family from my initial diagnosis almost two years ago through to the present. He has been thorough, understanding, and professional.

  • Apr 05, 2019

    Excellent doctor, very caring and spends time with his patients, is thoughtful of how his patients are feeling. Very glad Dr Mastrangelo of Bend Oregon recommended Dr Herzig to me.

  • Mar 23, 2019

    He was very knowledgeable. Staff were great !

  • Mar 22, 2019

    Yes, my name is [Name] and Dr. Herzig did the surgery for me and I thought that he was awesome and by that, I mean that he was considerate and respectful and he paid attention when I talked and he gave me good for Think answers to my questions to make sure that I understood what it was. We were talking about it gave me options and he follow through with everything that he said he would do and his support staff was also very helpful. I've had some problems since then and he's been consistent in his demeanor and professionalism in dealing with them never made me feel bad about anything to do with the surgery or anything that was going on.I enjoyed him very much and found him to make a an uncomfortable situation bearable as much as possible. I have a very cute mark.

  • Mar 22, 2019

    Dr. Herzig is a marvelous clinician. He goes out of his way to be quickly available to his patients. I recommend him highly with no reservations.

  • Mar 22, 2019

    Dr. Herzig is an outstanding physician who I trust without question. I will recommend him to my family and friends without hesitation.

  • Mar 22, 2019

    My experience with Dr. Herzig has been one in the same. Absolutely amazing. He's still he's interested. He remembers his patients. It's like a personal friend when I'm among him and it will I'm in this present and being examined. He listens he follows through and you make sure that you understand everything done or that he's going to do I absolutely love the way he does.The works with patients on the job.

  • Mar 20, 2019

    Dr. Herzig is very compassionate and dedicated to his profession.I wish he could be my primary gastro., it's great to feel worthy of a physicians care.

  • Mar 20, 2019

    Excellent experience. Comprehensive explanations and suggestions were extremely helpful.

  • Mar 20, 2019

    Great doctor. I have been happy with him for many years and he continues to do an amazing job, and is very helpful.

  • Mar 15, 2019

    Dr. Herzig has been wonderful. I've had 2 surgeries from him and always a care is Top Notch and he shows concern, compassion and good quality of care.

  • Mar 14, 2019

    Once I finally got to talk to Dr. Herzig, he explained things well and spent enough time with me.But I would have appreciated an earlier communication, if only by e-mail. My primary care doctor, Dr. Kerensky, referred me to Dr. Herzig, but then I never heard anything except that I needed to schedule a colonoscopy with Dr. Naugler. I assumed I'd been switched to Dr. Naugler. I was surprised but glad when I got a call to schedule an appointment with Dr. Herzig. But only when I spoke with him did I find out that he was the one who ordered the colonoscopy, and why.