Poisoning by heroin, undetermined, subsequent encounter

This code indicates a patient presenting for ongoing care related to a heroin poisoning where the intent (accidental vs. intentional self-harm) could not be determined at the time of initial assessment. The "subsequent encounter" designation means the patient is receiving follow-up treatment for the sequelae of the poisoning, not the initial acute event.

Apply this code for patients admitted for observation, rehabilitation, or management of complications (e.g., organ damage, infection) arising from a heroin overdose of undetermined intent, after the initial acute phase has passed. This is appropriate when the provider is documenting a visit focused on the lingering effects or recovery process.

• Ensure the documentation clearly supports "undetermined" intent; if intent is known, a more specific code (e.g., accidental, intentional self-harm) should be used.
• Verify that the encounter is indeed "subsequent" and not the initial acute treatment for the poisoning.
• Always code any associated manifestations or complications of the poisoning separately.