Abnormal weight gain

This code represents an increase in body weight that is considered outside the normal physiological range for an individual, without a specific underlying medical condition like obesity or pregnancy-related weight gain. It signifies an unexplained or pathological weight increase that warrants further investigation.

Apply this code when documentation indicates a patient is experiencing abnormal weight gain, and conditions such as obesity or excessive weight gain during pregnancy have been ruled out or are not the primary focus of the encounter. Supporting documentation should specify "abnormal weight gain," "unexplained weight gain," or similar terminology.

• Do not code this with E66.- (obesity) or O26.0- (excessive weight gain in pregnancy) due to the Excludes1 note.
• Always query for the underlying cause of the abnormal weight gain if not documented, as a more specific diagnosis may be available.
• Consider sequencing this code as a secondary diagnosis if the primary reason for the encounter is the investigation or management of a suspected underlying condition causing the weight gain.