D56.2

HCC Category Mapping

What This Code Means

Delta-beta thalassemia is a rare inherited blood disorder where the body doesn't make enough hemoglobin, a protein in red blood cells that carries oxygen. This condition affects the production of two types of hemoglobin chains (delta and beta), leading to anemia and related complications.

Coding Tips

• •Verify the specific type of thalassemia documented in the medical record, as D56.2 is specifically for delta-beta thalassemia and should not be confused with other thalassemia variants (D56.0, D56.1, D56.3, D56.4, D56.5, or D56.8)
• •Document any complications such as hemolytic anemia, splenomegaly, or transfusion dependence separately, as these may require additional codes to fully capture the clinical picture and severity

Clinical Significance

Delta-beta thalassemia is a rare inherited hemoglobin disorder caused by deletions affecting both the delta and beta globin genes, resulting in reduced production of both hemoglobin A and hemoglobin A2 with compensatory elevation of fetal hemoglobin. Clinical presentation is generally milder than beta thalassemia major, often resembling thalassemia intermedia with moderate anemia. The elevated fetal hemoglobin provides some clinical benefit by partially compensating for reduced adult hemoglobin production.

Documentation Requirements

• ✓Documentation must confirm delta-beta thalassemia specifically through hemoglobin electrophoresis showing elevated fetal hemoglobin with reduced hemoglobin A and A2, and ideally molecular genetic testing confirming the delta-beta deletion.
• ✓Record hemoglobin levels, mean corpuscular volume, reticulocyte counts, transfusion requirements if any, and complications.
• ✓Distinguish clearly from beta thalassemia and hereditary persistence of fetal hemoglobin.

Commonly Confused Codes