Diabetes mellitus (DM) is one of the most common chronic diseases affecting children under the age of 20, and it often leads to serious complications. In recent decades, there has been an increase in incidence of both types of DM among U.S. children. Having this chronic condition not only negatively impacts the health of these children but also their academic achievements. School health nurses struggle to manage these children appropriately and safely. The purpose of this project was to develop an evidence- based guideline for a standardized process in which school nurses coordinate the school and student health care teams to ensure a safe school environment for diabetic children. The Stevens star model of knowledge transformation was used to frame the development of this guideline. A team of experts, consisting of 10 ten school nurses, was assembled to provide formative and summative evaluations of the guidelines. Nine nurses completed and returned the questionnaires within the allotted time. The formative group feedback resulted in the revision of the guideline prior to distribution for the summative evaluation. The experts then participated in a summative evaluation using the Appraisal of Guidelines for Research & Evaluation (AGREE) II instrument. The revised guideline was approved and recommended for use by all of the experts without additional modification. Implementation of the guideline will result in social change by improving outcomes in students' health and academic achievement and in strengthening the role and autonomy of the school nurse. Dissemination will occur first in the school district through presentation and then to a larger audience through publication in journals focused on school nursing.