We wanted to reassure you that Arizona Oncology remains open to provide medically necessary, life-sustaining care. In addition, our expert care team can now see patients through scheduled virtual appointments on a secure platform from the comfort and safety of your home.

Please note; only one caregiver is allowed to accompany during your appointment, no one under the age of 18, and no visitors in the infusion rooms, radiation and treatment areas. If you have flu-like symptoms, you should contact Arizona Oncology before visiting our clinics for scheduled appointments. This includes fever and symptoms of respiratory illness, such as coughing or difficulty breathing.
We ask that you follow our tips to stay healthy and to help do our part in prevention of spreading of these viruses.

Locations and Physicians

Ann L. Kalhorn MD, FACS, FASCRS


Colon and Rectal Surgeons


Phoenix - Biltmore Cancer Center (Colon and Rectal Surgeons)
2222 E. Highland Ave., Suite 400
Phoenix, AZ 85016
Phone: 602-283-7995
Fax: 602-283-7996

Ann Kalhorn, MD, FACS, FASCRS


Boston University, Boston, MA

Medical School

Boston University, Boston, MA


Boston University Medical Center, Boston, MA


Boston University Medical Center, Boston, MA


University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School

Board Certification

Dr. Kalhorn is board certified by the American Board of Colon and Rectal Surgery.


Doctor Kalhorn graduated from Boston University, where she received both her undergraduate and medical degree in the accelerated Six Year Liberal Arts/Medical Education Program. Her general surgery internship and residency training was done at Boston University Medical Center, and she completed a fellowship in colon and rectal surgery at the University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School.

Doctor Kalhorn is board certified by the American Board of Colon and Rectal Surgery, and she is also a Fellow of both the American College of Surgeons and the American Society of Colon and Rectal Surgeons. She is a member of the Crohn’s and Colitis Foundation and the Arizona Medical Association. She has been in private practice since 1996, and has been featured as a Top Doc in Phoenix Magazine.

Dr. Kalhorn regularly performs colonoscopies for the early detection of colon cancer.  She treats anorectal conditions, diverticulitis, colorectal cancers and rectal prolapse, and also performs laparoscopic surgery. She is an avid runner and strongly believes in the role that nutrition and exercise play in maintaining good intestinal health



In The Media

Arizona Oncology physicians recognized as Top Docs and their Distinguished Medical Service