As of October 2015, ICD-9 codes are no longer used for medical coding. Instead, use the following two equivalent ICD-10-CM codes, which are an approximate match to ICD-9 code 747.81:
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
747.81 is a legacy non-billable code used to specify a medical diagnosis of anomalies of cerebrovascular system. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
References found for the code 747.81 in the Index of Diseases and Injuries:
An aneurysm is a bulge or "ballooning" in the wall of an artery. Arteries are blood vessels that carry oxygen-rich blood from the heart to other parts of the body. If an aneurysm grows large, it can burst and cause dangerous bleeding or even death.
The ICD-9 and ICD-10 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.