C crhunt78 Guru Messages 154 Location Olathe, KS Best answers 0 Feb 22, 2012 #1 Does anyone know the correct ICD-9 code for a diaphragmatic attenuation artifact that causes an MPI stress test to be abnormal? Do you use 794.39? This comes up a lot and I can't find any information on how to code this dx correctly. Please help!!