ICD-10-CM > R00-R99 > R50-R69 > R53 R53 Malaise and fatigue Non-Billable/Non-Specific Codes R53.0Neoplastic (malignant) related fatigueR53.1WeaknessR53.2Functional quadriplegiaR53.8Other malaise and fatigueR53.81Other malaiseR53.82Chronic fatigue, unspecifiedR53.83Other fatigue