Poisoning by methamphetamines, assault, subsequent encounter

This code signifies a patient presenting for follow-up care or treatment of adverse effects resulting from methamphetamine poisoning that occurred due to an intentional act of assault. The patient's symptoms are directly attributable to the toxic effects of methamphetamine, and the poisoning was inflicted by another person.

This code is appropriate for documenting subsequent encounters for patients who were poisoned by methamphetamine as a result of an assault. Examples include follow-up appointments for organ damage, psychiatric complications, or ongoing treatment for the physical effects of the poisoning after the initial acute phase. It should be used when the patient is no longer in the initial active treatment phase but is still receiving care related to the poisoning.

• Always assign an external cause code (Y90-Y99) to describe the circumstances of the assault.
• Do not use this code for initial encounters; a code with an "A" (initial encounter) seventh character would be appropriate for the acute phase.
• Ensure documentation clearly states the poisoning was due to an assault and that this is a subsequent visit.