Question: What is the correct diagnosis code for Segawa disease? Nevada Subscriber Answer: Your best bet is 333.6 (Genetic torsion dystonia). Segawa disease, also known as dopamine-responsive dystonia, is a rare, inherited disorder that involves progressive dystonia (also known as neurological movement disorder). Some symptoms include gait disturbance, postural tremor, increased muscle tone, and exaggerated deep tendon reflexes.