Adverse effect of drug aff the autonomic nervous sys, init

This code signifies an undesirable or harmful reaction experienced by a patient due to a medication primarily intended to affect the autonomic nervous system, when the patient is receiving initial treatment for this adverse effect. These reactions are not due to overdose, poisoning, or therapeutic underdosing, but rather an unexpected or exaggerated response to a properly administered drug. The autonomic nervous system controls involuntary bodily functions such as heart rate, digestion, and breathing.

Use this code when documenting a patient's first presentation or admission for an adverse reaction to a drug that targets the autonomic nervous system. Examples include anticholinergic side effects (e.g., dry mouth, blurred vision, urinary retention) from certain antidepressants or antihistamines, or adrenergic side effects (e.g., palpitations, hypertension) from decongestants. This code is appropriate when the drug was prescribed and taken correctly, but still caused an adverse outcome.

• Ensure documentation clearly states the reaction is an adverse effect and not poisoning or overdose.
• Always sequence this code after the code for the specific manifestation of the adverse effect.
• Confirm the drug involved is primarily known to affect the autonomic nervous system.