D55.9

HCC Category Mapping

What This Code Means

A type of anemia caused by an enzyme disorder, but the specific enzyme deficiency has not been identified or documented. This is a placeholder code when the exact cause is unknown.

Coding Tips

• •This is the least specific code in the D55 category; use only when the specific enzyme disorder cannot be determined
• •Query the provider to obtain more specific diagnosis if possible to allow for more precise coding

Clinical Significance

This unspecified code is used when hemolytic anemia is attributed to an enzyme disorder but the specific enzyme deficiency has not been identified or documented. It represents the least specific code in the D55 category and should prompt a query to the provider for additional diagnostic workup. The clinical impact of unspecified enzyme disorders varies widely, making accurate classification important for appropriate management and risk stratification.

Documentation Requirements

• ✓Documentation should include the basis for suspecting an enzyme disorder (e.g., chronic hemolysis with negative Coombs test, family history), results of any enzyme assays performed, and the reason why a more specific enzyme cannot be identified.
• ✓Record hemoglobin levels, reticulocyte counts, and management plan.
• ✓A provider query should be initiated to obtain additional specificity whenever possible.

Commonly Confused Codes