Adverse effect of drug aff the autonomic nervous sys, subs

This code signifies a harmful or unintended reaction to a medication that primarily impacts the body's involuntary functions, such as heart rate, digestion, or breathing. These effects are not due to an overdose or poisoning, but rather an expected or unexpected side effect of a properly administered drug. The "subsequent encounter" indicates that the patient is receiving follow-up care for this adverse effect.

Apply this code when documenting ongoing treatment or monitoring for an adverse effect of a drug that has a primary impact on the autonomic nervous system. This includes situations where a patient is returning for evaluation of persistent symptoms like orthostatic hypotension, urinary retention, or excessive sweating, which are attributed to a previously administered medication.

• Always identify the specific drug causing the adverse effect using an additional code from T36-T50.
• Ensure the documentation clearly states the adverse effect is not due to poisoning, underdosing, or an allergic reaction.
• Reserve this code for follow-up visits after the initial treatment of the adverse effect has begun.