There isn't classification about the VBI yet, but there are three phenotypes of the basilar artery occlusion depending on the modal of initial symptoms.
phenotype 1: patients present progressive brain stemsymptoms(for example: vertigo, doublevision, dysarthria, hemiparesis, or paresthesia) without any prodromal symptoms.
phenotype 2: patients present nonspeciﬁc, such as nausea, tinnitus, hearing loss, and vertigo, which can precede the onset of the monophasic, progressive deﬁcits by days, but typically by several weeks.
phenotype 3: patients present symptoms with onset of severe, often bilateral motor weakness, ophtalmoplegia, and coma.  The patients may have a severe outcome if basilar artery cannot be recanalized fast.
Vertebrobasilar insufficiency classification
Aortitis classification
Vertebrobasilar insufficiency laboratory findings
Acoustic neuroma classification
Vertebrobasilar insufficiency MRI
Cerebral aneurysm classification
Glaucoma classification
Ganglioneuroma classification