D56.0

HCC Category Mapping

What This Code Means

Alpha thalassemia is an inherited blood disorder where the body doesn't make enough alpha-globin protein, a component of hemoglobin that carries oxygen in red blood cells. This results in anemia, fatigue, and potentially serious complications if severe.

Coding Tips

• •Verify the specific type of alpha thalassemia (such as alpha thalassemia trait, HbH disease, or hydrops fetalis) in the clinical documentation, as these may require additional specificity codes
• •Check for associated complications like splenomegaly, bone deformities, or transfusion dependency that should be coded separately to capture the full clinical picture

Clinical Significance

Alpha thalassemia encompasses a spectrum of inherited hemoglobin disorders caused by deletion or mutation of one to four alpha-globin genes. Clinical severity ranges from the silent carrier state (one gene affected) and alpha thalassemia trait (two genes) to Hemoglobin H disease (three genes) and the fatal hydrops fetalis (four genes). This is particularly prevalent in Southeast Asian, African, and Mediterranean populations, and proper classification impacts genetic counseling and clinical management.

Documentation Requirements

• ✓Documentation must specify the type and severity of alpha thalassemia (silent carrier, trait, Hemoglobin H disease, or hydrops fetalis) with supporting genetic testing or hemoglobin electrophoresis results.
• ✓Record baseline hemoglobin and mean corpuscular volume, transfusion requirements, iron studies to differentiate from iron deficiency, and any complications such as splenomegaly or bone deformities.
• ✓Genetic counseling status should be noted.

Commonly Confused Codes