Underdosing of butyrophen/thiothixen neuroleptics, init

This code indicates that a patient has experienced adverse effects due to receiving an insufficient amount of a butyrophenone or thiothixene neuroleptic medication. This underdosing can lead to a recurrence or worsening of the psychiatric condition the medication was intended to treat. It signifies that the patient did not receive the prescribed therapeutic dose, resulting in a suboptimal clinical outcome.

Use this code when documenting a patient's initial presentation for symptoms or conditions directly attributable to not receiving enough of a butyrophenone or thiothixene neuroleptic. This includes situations where a patient self-reduced their dosage, a prescription was filled incorrectly with a lower dose, or a healthcare provider inadvertently prescribed an insufficient amount. It is appropriate for the first time a patient is seen for this specific underdosing event.

• Always assign an additional code to specify the psychiatric condition being treated by the neuroleptic.
• Consider external cause codes (e.g., Y63.6 for underdosing of medication in medical and surgical care) to provide further detail on the circumstances of the underdosing.
• Ensure "initial encounter" is appropriate; subsequent encounters for the same underdosing event would use the appropriate subsequent encounter code.