D57.412

HCC Category Mapping

What This Code Means

This is a blood disorder where a person has both sickle-cell disease and thalassemia (two inherited conditions affecting red blood cells), and their spleen has become enlarged and is trapping blood cells, which can cause serious complications. This specific code is used when the exact type of sickle-cell thalassemia is not specified.

Coding Tips

• •Verify documentation specifies splenic sequestration as a complication; if only sickle-cell thalassemia is documented without this complication, use a different D57.4 code
• •This code requires a 5th character; ensure the 5th digit (2) is included to indicate 'unspecified' type, and confirm no additional specificity (such as HbSC or HbSD disease) is documented that would require a more specific code

Clinical Significance

Splenic sequestration in unspecified sickle-cell thalassemia is an acute crisis where the spleen traps large volumes of blood, causing rapid anemia and potentially hemodynamic instability. Sickle-cell thalassemia patients, particularly beta-plus variants, may retain splenic function longer than Hemoglobin SS patients, maintaining the risk of sequestration into adulthood. The thalassemia component (beta-zero vs. beta-plus) is unspecified, representing a documentation opportunity.

Documentation Requirements

• ✓Documentation must confirm the sickle-cell thalassemia genotype and acute splenic sequestration with evidence of rapid splenic enlargement and hemoglobin decline.
• ✓Query for beta-zero vs.
• ✓beta-plus specification.
• ✓Record splenic size, hemoglobin trend, reticulocyte count, platelet count, treatment including transfusion, and whether splenectomy is recommended.
• ✓Note splenic function status (functional vs.
• ✓autosplenectomized).

Commonly Confused Codes