Hereditary factor IX deficiency

This code signifies a congenital bleeding disorder caused by a deficiency in coagulation factor IX, also known as hemophilia B or Christmas disease. It leads to impaired blood clotting, resulting in prolonged bleeding episodes, often spontaneous or following trauma.

Assign this code for patients diagnosed with inherited factor IX deficiency, confirmed by laboratory testing showing reduced factor IX activity. It is appropriate for both newly diagnosed cases and ongoing management of the condition. Documentation should clearly state the diagnosis of hereditary factor IX deficiency.

• Do not confuse with acquired factor IX deficiency (e.g., due to liver disease or vitamin K deficiency), which would be coded differently.
• Consider additional codes for any associated complications, such as hemarthrosis (M25.0_).
• Ensure documentation specifies "hereditary" or "congenital" to support the use of this code.