Excessive weight gain in pregnancy, third trimester

This code identifies a diagnosis of excessive gestational weight gain occurring specifically during the third trimester of pregnancy. It indicates that the patient's weight increase has exceeded recommended guidelines for healthy pregnancy weight gain in the final stage of gestation.

Apply this code when documentation clearly states excessive weight gain in a pregnant patient who is in her third trimester. This diagnosis is typically made based on comparison to established gestational weight gain charts and clinical assessment by the provider.

• Ensure the documentation explicitly states "excessive" weight gain and specifies the "third trimester."
• Do not use for general weight gain in pregnancy without the "excessive" qualifier, or for weight gain in other trimesters.
• Sequence as a secondary diagnosis following the code for the obstetric encounter (e.g., Z34.xx for supervision of normal pregnancy).