New codes have been created to uniquely identify aneurysm of other precerebral artery (I72.5), and aneurysm of vertebral artery (I72.6). New codes have also been created to identify dissection of unspecified artery (I77.70), dissection of other precerebral arteries (I77.75), dissection of artery of upper extremity (I77.76), and dissection of artery of lower extremity (I77.77). Prior to this change, there were no ICD-10-CM codes to specifically describe an aneurysm or dissection of precerebral or vertebral arteries. Additionally, the title of code I77.79, Dissection of other artery, has been revised to “Dissection of other specified artery.”
An aneurysm is a balloon-like bulge in an artery. However, certain medical problems, trauma, and genetic conditions can damage or injure artery walls. Aneurysms can grow large and rupture or dissect. Arterial dissection refers to the abnormal, and sometimes abrupt, formation of a tear along the inside wall of an artery. As the tear grows, a small pouch (false lumen) is created. The blood that accumulates inside this false lumen can cause blood clots or even block blood flow, leading to a stroke. Both rupture and dissection are often fatal.