Cold autoimmune hemolytic anemia

This code represents a condition where the body's immune system mistakenly produces antibodies that attack and destroy red blood cells at cold temperatures, leading to anemia. This destruction is mediated by autoantibodies, typically IgM, that bind to red blood cells in cooler parts of the body. The resulting hemolysis can cause symptoms such as fatigue, pallor, and jaundice.

Use this code when documentation explicitly states a diagnosis of cold autoimmune hemolytic anemia. This diagnosis is typically supported by laboratory findings such as a positive direct antiglobulin test (DAT) with C3d specificity, cold agglutinin titers, and evidence of hemolysis. It is appropriate for both primary and secondary forms of cold agglutinin disease.

• Differentiate from warm autoimmune hemolytic anemia (D59.11), which involves IgG antibodies active at body temperature.
• Ensure documentation specifies "cold" to support this specific subtype of autoimmune hemolytic anemia.
• Code any underlying conditions causing secondary cold autoimmune hemolytic anemia (e.g., lymphoma, mycoplasma pneumonia) as additional diagnoses.