Adverse effect of butyrophen/thiothixen neuroleptics, init

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of butyrophenone or thiothixene neuroleptic medications. These adverse effects are not due to poisoning, underdosing, or an allergic reaction, but rather an expected or unexpected side effect of the drug itself when properly administered.

Apply this code when a patient presents with symptoms directly attributable to an adverse effect of a butyrophenone (e.g., haloperidol) or thiothixene (e.g., thiothixene) neuroleptic, and this is the first time the patient is being seen for this specific adverse event. Examples include extrapyramidal symptoms, tardive dyskinesia, or neuroleptic malignant syndrome occurring during initial treatment or a new adverse reaction to an ongoing prescription.

• Always sequence this code first when the adverse effect is the primary reason for the encounter.
• Requires an additional code to identify the specific manifestation of the adverse effect (e.g., G21.0 for neuroleptic malignant syndrome).
• Ensure documentation clearly distinguishes between an adverse effect, poisoning, or allergic reaction.