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

This code signifies the long-term or residual effects resulting from an accidental overdose or poisoning by medications used to treat Parkinson's disease or other central nervous system depressants that relax muscle tone. These sequelae are the lasting health problems or conditions that persist after the initial acute poisoning event has resolved.

Apply this code when documenting chronic conditions, disabilities, or other persistent health issues directly attributable to a past, unintentional poisoning by antiparkinsonism drugs or central muscle-tone depressants. This is appropriate for follow-up encounters where the patient is being treated for the lasting consequences, not the acute poisoning itself.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., neurological deficit, organ damage).
• Ensure documentation clearly links the current condition to the past accidental poisoning event.
• Do not use this code for the initial acute poisoning episode; instead, use the acute poisoning code with the appropriate seventh character.