Atherosclerosis of the aorta is a common condition in the elderly and the ICD-10-CM code is I70.0. However, it’s important to distinguish between atherosclerosis of the vessel (which is a risk adjusted diagnosis) and a valve (ICD-10-CM code I35.8, which is not risk adjusted). Where possible and known, the PCP should document the section of the aorta, such as “Atherosclerosis of the _______ aorta.”