Wasting disease (syndrome) due to underlying condition

This code signifies a significant, involuntary loss of body weight and muscle mass (wasting) that is a direct consequence of an underlying chronic disease or medical condition. It indicates a systemic catabolic state where the body breaks down its own tissues due to the primary illness.

Use this code when documentation clearly links severe weight loss and muscle atrophy to a specific underlying chronic disease, such as cancer, AIDS, or severe chronic obstructive pulmonary disease (COPD). The physician's notes should explicitly state "wasting syndrome due to [underlying condition]" or similar phrasing.

• Always code the underlying condition first, as this code is secondary to the primary disease causing the wasting.
• Distinguish from cachexia (R64), which is a more general term for severe weight loss, and nutritional marasmus (E41), which is primarily due to protein-energy malnutrition.
• Ensure documentation specifies the cause of the wasting; without a clear underlying condition, this code is inappropriate.