The correct change in mental status (AMS) coding starts with R41.82 (altered mental status, unspecified) when the cause is unknown. Once a specific cause is identified, upgrade to G93.41 (metabolic encephalopathy), G93.40 (encephalopathy unspecified), or F05.0/F05.1 (delirium). Always code the underlying etiology such as sepsis (A41.9 + G93.41) or UTI (N39.0 + R41.82). Do not use R41.82 once encephalopathy is confirmed. Change in mental status […]