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

4.8 out of 5 (456 Ratings, 182 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

4.8 out of 5 (456 Ratings, 182 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

  • Aug 02, 2019

    He is the best. Highly skilled. Very respectful.

  • Jul 20, 2019

    very attentive staff

  • Jul 20, 2019

    Great customer service. Very organized and efficient care.

  • Jul 17, 2019

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

  • 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 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.

  • 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 24, 2019

    I'm very satisfied with this provider. He is very professional. He does fantastic work. He is a good doctor. He's a good person and he has fantastic bedside manners. I really appreciate the way he answers to the questions I asked, and all the feedback that he provides in concerns that I may have. I really appreciate him very much.

  • Jun 22, 2019

    Everything about my experience - check-in, nurses' preparing me for the procedure, conversations with Dr. Herzig & the doctor who assisted him, who spoke with me first in the prep room - were professional yet friendly & encouraging. Their manners & explanations were exemplary. I was very nervous, but felt in good hands @ all times.

  • Jun 21, 2019

    Dr Herzig is great! The nursing staff was awesome.

  • Jun 15, 2019

    I have valued Dr Herzig's care and advice.

  • Jun 14, 2019

    Dr. Herzig is the best doctor one could hope for. He is a true professional respected by his staff and team. I feel very fortunate to have Dr. Herzig as my doctor. Everything I have experienced has been with 'top notch' expertise. He is very personable and addresses, communicates and implements the best possible health care anyone could hope for. He is an incredible health care provider!

  • Jun 14, 2019

    Friendly, find, humorous and gave excellent care

  • Jun 08, 2019

    The directions mailed to me were very helpful. I called to verify some things, they were very polite and helpful. When we got to the first level we checked in. They were helpful in directing u to next place. The check in nurse was friendly and explained things. The dr met me as I was wheeled toward the procedure room. He was friendly and explained things. Dr asked if I had any questions. I felt at ease.

  • 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 .