Sickle-cell trait

This code identifies individuals who carry one copy of the sickle hemoglobin gene (HbS) but do not manifest the full clinical symptoms of sickle cell disease. These individuals are typically asymptomatic, but their red blood cells can sickle under extreme conditions, such as severe hypoxia or dehydration.

Use this code when documentation explicitly states "sickle-cell trait" or "heterozygous for HbS." It is appropriate for screening results indicating the presence of the trait, or for patients identified as carriers during family studies or genetic counseling.

• Do not use this code for active sickle cell anemia or other sickle cell diseases; those conditions have distinct codes.
• This code is for the carrier state only, not for any complications that might arise from the trait (e.g., splenic infarction at high altitude), which would be coded separately.
• Ensure documentation clearly differentiates between sickle-cell trait and sickle cell disease to avoid miscoding.