Poisoning by histamine H2-receptor blockers, acc, subs

This code signifies an unintentional overdose or adverse reaction to histamine H2-receptor blockers, such as cimetidine, ranitidine, or famotidine, that results in poisoning. The "subsequent encounter" designation indicates that the patient is receiving follow-up care for the initial poisoning event.

Apply this code when a patient presents for ongoing management, monitoring, or treatment related to an accidental poisoning by H2-receptor blockers. This could include follow-up appointments after an emergency room visit, continued inpatient care, or outpatient clinic visits to assess recovery and address any lingering effects.

• Ensure the poisoning was accidental and not intentional self-harm or assault.
• Verify that the substance involved was specifically an H2-receptor blocker.
• Confirm this is a subsequent encounter for the poisoning, not the initial presentation.