Low weight gain in pregnancy, first trimester

This code signifies inadequate maternal weight gain during the initial three months of pregnancy. It indicates a deviation from expected physiological weight increase, which can be a marker for potential nutritional deficiencies or underlying health issues affecting fetal development.

Apply this code when documentation explicitly states "low weight gain" or "inadequate weight gain" specifically identified in the first trimester. This is typically supported by a review of the patient's weight history against expected gestational weight gain charts.

• Ensure the documentation clearly specifies "first trimester" for low weight gain.
• Consider co-reporting with codes for underlying causes, such as hyperemesis gravidarum (O21.-) or nutritional deficiencies (E40-E64), if identified.
• Do not confuse with codes for maternal underweight (O99.89) unless the patient was underweight prior to pregnancy and this is a separate, distinct finding.