Poisn by antiparkns drug/centr musc-tone depr, acc, subs

This code signifies an adverse event where a patient has unintentionally ingested or been administered an excessive amount of medication used to treat Parkinson's disease or other central nervous system depressants, and this is a follow-up encounter for that poisoning. The patient is receiving ongoing care for the effects of the accidental overdose.

Use this code for subsequent visits when a patient is being treated for complications or lingering effects of an accidental poisoning by antiparkinsonism drugs or other central muscle-tone depressants. This applies after the initial emergency treatment, such as during hospitalization for observation, follow-up clinic visits, or rehabilitation.

• Always assign an additional code for the specific drug if known, using codes from T36-T50.
• Ensure the "D" seventh character is appropriate for subsequent encounters; "A" is for initial, "S" for sequela.
• Distinguish carefully between accidental (unintentional) and intentional poisonings, as different codes apply.