If CAD is a graft but you don't know the type, use 414.05 If you find coding coronary artery disease (CAD) confusing, you're not alone. Check your cardiologist's documentation and then look to this easy coding aid to help make the appropriate selection every time, says Greg Schnitzer, RN, CCS, CCS-P, CPC, CPC-H, RCC, CHC, product manager at CodeRyte Inc.