This paper is a landmark study in evaluating GFR equations for diabetic patients, specifically comparing the 2009 and 2021 CKD-EPI equations among Jordanian individuals with type 2 diabetes mellitus. It demonstrates significant concordance while revealing that the 2021 equation increases estimated GFR, leading to notable reclassification in CKD staging. These findings have crucial implications for patient management and highlight the need for updated diagnostic tools in diabetic kidney disease care. Overall, it reinforces the importance of accurate GFR assessment for optimal clinical outcomes.​