585.5 is a legacy non-billable code used to specify a medical diagnosis of chronic kidney disease, stage v. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
References found for the code 585.5 in the Index of Diseases and Injuries:
You have two kidneys, each about the size of your fist. Their main job is to filter wastes and excess water out of your blood to make urine. They also keep the body's chemical balance, help control blood pressure, and make hormones.
General Equivalence Map Definitions 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.
As of October 2015, ICD-9 codes are no longer used for medical coding. Instead, use this equivalent ICD-10-CM code, which is an exact match to ICD-9 code 585.5:
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.