Specialized Care from Innovative Surgeons

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(858) 558-2272

Compassionate and Individualized Care

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(858) 558-2272

Training, Experience, and Board-Certification Do Matter!

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(858) 558-2272

Welcome to San Diego Colon & Rectal

Located in La Jolla, California, San Diego Colon and Rectal Surgeons is a practice composed of two experienced, fellowship-trained, and board-certified surgeons who are dedicated to the practice of high-quality, state-of-the-art colon and rectal surgery.

The team, led by M. Jonathan Worsey, MD, and Keith A. Beiermeister, MD, is committed to providing compassionate, individualized care to their patients utilizing the most modern diagnostic and therapeutic techniques available.

The practice specializes in all aspects of colon and rectal surgery but has particular expertise and experience in minimally invasive colon and rectal surgery, colon and rectal cancer, inflammatory bowel surgery, and complex re-operative surgery.

The vast majority of major operations are performed with both surgeons present to ensure an efficient, safe, and successful procedure; this is quite unusual in most surgical practices today. They do not employ allied health providers, and direct and specialized care is given by the surgeons at all times. The team prides itself on excellent surgical outcomes and the provision of the best possible care and attention.

M. Jonathan Worsey, MD, FRCS, FACS, FASCRS

M. Jonathan Worsey, MD, is a board-certified colon and rectal surgeon at San Diego Colon and Rectal Surgeons in La Jolla, California. Dr. Worsey was born in South Wales and obtained his undergraduate degree from the prestigious University of Cambridge, England, being the first person in his family to attend college. He studied medicine at St. Thomas’ Hospital in London, which can trace its origins as a place of healing back to the 12th century, obtaining his medical degree in 1985 with honors. Following junior surgical residency positions in the United Kingdom, he came to the United States in 1989 on a two-year research fellowship at the University of Iowa.

Meet M. Jonathan Worsey, MD, FRCS, FACS, FASCRS

Keith A. Beiermeister, MD, FACS, FASCRS

Keith A. Beiermeister, MD, is a board-certified colon and rectal surgeon at San Diego Colon and Rectal Surgeons in La Jolla, California. Dr. Beiermeister is a native East Coaster and was born and raised in New Jersey. After attending boarding school at Cushing Academy in Ashburnham, Massachusetts, he received his undergraduate degree at Hamilton College in upstate New York. He then went on to receive a master’s degree in biology from Drexel University in Philadelphia, Pennsylvania, before undertaking his formal medical training.

Meet Keith A. Beiermeister, MD, FACS, FASCRS

Scripps Memorial Hospital

Established in 1924 by Ellen Browning Scripps, Scripps Memorial Hospital La Jolla has been one of Southern California’s premier medical centers for more than 80 years. Scripps Memorial Hospital La Jolla offers a wide range of clinical, surgical and specialty services. It is consistently recognized for quality patient care and is the first in San Diego to be designated a Magnet Hospital by the American Nursing Association for excellence in patient care.


Dr Worsey is the best doctor in his field. Can not thank you enough for the excellent health care for the past 30 years. The staff is also excellent. God Bless all of you!

Paul W.

Absolutely love Dr Biermiester and his staff. They are friendly, professional, and extremely helpful. They really listen to you and take your concerns seriously. Thank you!! Highly recommend them.

Meagan Z.

I had my J-Pouch scoped after 10 years (I know… not good) and Dr. Worsey did a fantastic job! His nurse who assisted and the lady at the front was also very nice. I also got to see the procedure on the TV screen as it was being done. So cool!!

Joe R.

Dr. Worsey is an excellent Doctor in his field with an appropriately excellent staff. I know that I am in very competent hands when dealing with Dr. Worsey. We, his patients, are very lucky.

Thomas R.

Dr Worsey and Beiermeister have taken wonderful care of me over the past 3 years. From consultation to management of complications from surgeries elsewhere, and finally closure of my Ostomy. Both Doctors and their staff are helpful, courteous and professional. Complications from 5 prior surgeries left me quite anxious. Yet, both Doctors took the time to listen, explain and reassure me every visit or hospital stay. Both Doctors are empathetic and do not rush you despite how busy they are. I strongly recommend Doctors Worsey and Beiermeister and their staff, and would encourage anyone to see them for related matters.

Bill P.

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