R63: Symptoms and signs concerning food and fluid intake

R63.5: Abnormal weight gain

Abnormal weight gain—classified under the code R63.5—is a medical condition characterized by an unexpected increase in body weight. This weight gain is considered abnormal when it is more than what is expected based on diet, exercise and lifestyle habits. It's often a symptom rather than a disease itself and may signal an underlying health issue. Conditions like hypothyroidism, heart failure, kidney problems, and certain types of cancer can lead to abnormal weight gain. Additionally, medications for depression, diabetes, and high blood pressure may also result in unexpected weight gain. Usually, this condition is associated with symptoms like increased appetite or swelling. It's important to be aware that unexpected, abnormal weight gain should be evaluated by a healthcare professional to determine the cause and proper course of action.