D59.11

HCC Category Mapping

What This Code Means

Anemia caused by antibodies that attack red blood cells at normal body temperature, leading to their destruction and resulting in low red blood cell counts.

Coding Tips

• •Document the presence of positive direct antiglobulin test (Coombs test) when available
• •Note any underlying conditions like lupus or lymphoma that may be associated

Clinical Significance

Warm autoimmune hemolytic anemia is the most common form of autoimmune hemolytic anemia, accounting for approximately 70-80% of cases, where immunoglobulin G autoantibodies bind to red blood cells at body temperature (37 degrees Celsius) and cause their destruction primarily in the spleen. It may be primary (idiopathic) or secondary to systemic lupus erythematosus, chronic lymphocytic leukemia, non-Hodgkin lymphoma, or other autoimmune disorders. First-line treatment includes corticosteroids, with rituximab and splenectomy reserved for refractory cases.

Documentation Requirements

• ✓Document the positive direct antiglobulin test showing immunoglobulin G antibody specificity.
• ✓Record hemoglobin levels, reticulocyte count, peripheral blood smear findings (spherocytes, polychromasia), and hemolysis markers.
• ✓Document whether the condition is primary (idiopathic) or secondary to an underlying disease, and code the underlying condition when present.
• ✓Include treatment history and response to corticosteroids or other immunosuppressive agents.

Commonly Confused Codes