Adverse effect of drug/meds/biol subst, subs

This code signifies a patient experiencing an unintended and undesirable reaction to a drug, medicament, or biological substance, where the initial treatment for the adverse effect has already occurred. It indicates that the patient is returning for follow-up care, monitoring, or continued management of the adverse reaction.

Apply this code when a patient presents for a follow-up visit related to an adverse drug reaction that was previously documented and treated. This includes scenarios where the patient is being monitored for resolution of symptoms, adjusting medications to counteract the adverse effect, or managing long-term complications stemming from the initial reaction.

• Always sequence this code after the code identifying the specific adverse effect (e.g., rash, nausea).
• Ensure documentation clearly states the encounter is for follow-up or continued management of a previously treated adverse effect.
• Do not use this code for initial encounters or for adverse effects due to poisoning, underdosing, or toxic effects.