Poisoning by histamine H2-receptor blockers, self-harm, subs

This code signifies a patient presenting for follow-up care related to an intentional overdose of histamine H2-receptor blockers (e.g., cimetidine, ranitidine, famotidine). The initial poisoning event was a deliberate act of self-harm, and this encounter is for ongoing management or complications.

Apply this code when a patient is seen for continued treatment, monitoring, or evaluation of sequelae following an intentional self-poisoning with an H2-receptor blocker. This includes appointments for psychiatric evaluation, management of organ damage, or follow-up on adverse effects from the initial overdose.

• Always sequence this code after the primary diagnosis for the specific condition being treated during the subsequent encounter.
• Ensure documentation clearly states "intentional self-harm" and that the encounter is not the initial treatment for the poisoning.
• Do not use for accidental poisonings or adverse effects from therapeutic use.