Please see the IV contrast agent guidelines. However, there is a lack of data supporting an additive risk of contrast induced AKI beyond CKD stage; so it is likely the eGFR threshold does not need to be modified based on chronic diseases such as diabetes mellitus (refs).
1. American College of Radiology. Manual on contrast media. Version 10.3. Reston, Va: American College of Radiology, 2018. https://www.acr.org/Clinical-Resources/Contrast-Manual. Accessed May 16, 2019.
2. Nyman U, Ahlkvist J, Aspelin P, et al. Preventing contrast medium-induced acute kidney injury : Side-by-side comparison of Swedish-ESUR guidelines. Eur Radiol 2018;28(12):5384–5395.