Poisoning by phenothiaz antipsychot/neurolept, undet, subs

This code signifies a poisoning event involving phenothiazine antipsychotics or other neuroleptics where the intent (accidental, intentional self-harm, assault) cannot be determined. It is used when the patient is receiving active treatment for the sequelae of the poisoning after the initial encounter.

Apply this code for follow-up visits, hospital readmissions, or ongoing care related to the effects of an undetermined phenothiazine or neuroleptic poisoning. This includes managing complications, monitoring recovery, or addressing persistent symptoms after the acute phase has passed.

• Requires an additional code for the specific manifestation of the poisoning (e.g., coma, extrapyramidal symptoms).
• Distinguish from initial encounters (A) or sequela (S) based on the patient's stage of care.
• Ensure documentation clearly supports the "undetermined" intent and the "subsequent encounter" status.