Question: Encounter notes indicate that a patient suffers from “familial dystonia, idiopathic.” How should I choose a diagnosis code for this patient? AAPC Forum Subscriber Answer: Without any further information, it looks like the correct code for this encounter would be G24.1 (Genetic torsion dystonia). While the descriptor does not match your notes, the alternate terms for G24.1 include an option that does line up. The alternate terms are: