CPT code 90989 represents an unlisted dialysis procedure tailored to individuals with end-stage renal disease (ESRD). This code is utilized when specific dialysis interventions are performed that do not align with standard, predefined codes. The abbreviation signifies the uniqueness of the dialysis procedure provided, allowing for flexibility in coding and documentation. Healthcare providers may employ this code to capture and report innovative or specialized dialysis procedures designed to address the distinct needs of patients with ESRD. The unlisted nature of the code emphasizes the procedure's customized and individualized aspects, contributing to the accurate representation of the services delivered.