Adverse effect of opium, subsequent encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of opium, occurring during a follow-up visit or after the initial treatment phase. This adverse effect is not due to poisoning or overdose, but rather an unintended consequence of the drug administered as prescribed.

Apply this code when documenting a patient presenting for ongoing management or evaluation of an adverse reaction to opium, such as persistent nausea, constipation, or sedation, after the initial encounter for the adverse effect has passed. This is appropriate for follow-up appointments where the adverse effect is still being monitored or treated.

• Always sequence this code after the code for the specific adverse effect (e.g., nausea, constipation).
• Ensure documentation clearly distinguishes an adverse effect from poisoning or overdose.
• Verify that the encounter is indeed "subsequent" and not the initial presentation of the adverse effect.