Adverse effect of anticholinesterase agents, init encntr

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of an anticholinesterase agent. These agents are typically used to treat conditions like myasthenia gravis or Alzheimer's disease, and an adverse effect indicates the drug was taken correctly but still caused a negative outcome.

Apply this code when documenting a patient's initial presentation for symptoms directly attributable to an adverse reaction from an anticholinesterase medication. This includes situations where the patient develops new symptoms or experiences a worsening of existing conditions as a direct result of the drug's intended action.

• Always sequence this code after the code for the specific manifestation of the adverse effect.
• Ensure documentation clearly distinguishes between an adverse effect (correctly prescribed and administered drug) and poisoning (incorrect dosage or non-therapeutic use).
• The "A" in the 7th character indicates this is the first time the patient is being seen for this particular adverse effect.