Poisoning by anticholinesterase agents, self-harm, init

This code signifies a patient presenting with adverse effects from ingesting or otherwise administering anticholinesterase agents with the deliberate intent to harm themselves. These agents interfere with the breakdown of acetylcholine, leading to a cholinergic crisis characterized by symptoms like excessive salivation, lacrimation, urination, defecation, gastrointestinal upset, emesis, and muscle weakness. The "initial encounter" indicates the patient is receiving active treatment for the poisoning.

Apply this code when documenting a patient admitted to the emergency department or inpatient setting due to an overdose of medications such as organophosphates, carbamates, or certain Alzheimer's drugs, where the patient explicitly states or clinical evidence strongly suggests self-harm. This code is appropriate for the initial hospitalization or visit where the poisoning is being actively managed.

• Always sequence this code first when it represents the primary reason for the encounter.
• Requires an external cause code (X60-X84) to fully describe the intent and circumstances of the self-harm.
• Do not use for accidental exposures or therapeutic misadventures; those require different poisoning codes.