In this SurgOnc Today® SOI Article Series episode, Dr. Shishir Maithel, Editor of Surgical Oncology Insight, discusses with Dr. Heather Wachtel and Dr. Sara Ginzberg rates of guideline-concordant postoperative radioactive iodine therapy in patients with well-differentiated thyroid cancer across six constituent hospitals, before and after the release of the 2015 American Thyroid Association guidelines, as reported in their article, "Implementation of the 2015 American Thyroid Association Guideline Changes Across a Health System: A Quality Improvement Opportunity."