D57.432

HCC Category Mapping

What This Code Means

This is a serious blood disorder where a person has both sickle cell disease and a form of thalassemia, and their spleen is trapping and destroying blood cells faster than normal. This condition causes the spleen to become enlarged and can lead to severe anemia and other complications.

Coding Tips

• •This code requires documentation of both the sickle-cell thalassemia diagnosis AND the acute splenic sequestration event; do not assign this code if only the sickle-cell thalassemia is present without documented sequestration
• •Splenic sequestration is a medical emergency requiring immediate treatment; verify the clinical documentation clearly states the sequestration episode and ensure this code is not confused with other sickle-cell complications like vaso-occlusive crisis

Clinical Significance

Splenic sequestration in sickle-cell thalassemia beta zero is an acute crisis where the spleen traps blood, causing rapid anemia and potential cardiovascular collapse. Beta-zero patients may undergo autosplenectomy in childhood similar to Hemoglobin SS patients, making this complication more common in younger patients. However, some beta-zero patients retain splenic function longer depending on the specific thalassemia mutation and fetal hemoglobin levels.

Documentation Requirements

• ✓Documentation must confirm sickle-cell thalassemia beta zero genotype and acute splenic sequestration with evidence of rapid splenic enlargement and hemoglobin decline.
• ✓Record splenic size (exam or imaging), hemoglobin trend from baseline, reticulocyte count, platelet count, treatment including transfusion, hemodynamic stability assessment, and whether splenectomy is planned.

Commonly Confused Codes