Advrs effect of unsp drugs aff the autonm nervous sys, subs

This code signifies a harmful or undesirable reaction to a medication that primarily impacts the body's involuntary functions, such as heart rate, digestion, or breathing, during a follow-up visit. The specific drug causing the adverse effect is not identified.

Apply this code when a patient presents for ongoing management or evaluation of an adverse autonomic nervous system effect from an unknown drug. This is appropriate for subsequent encounters after the initial diagnosis and treatment.

• Ensure documentation clearly states the adverse effect is drug-induced and affects the autonomic nervous system.
• Only use this code when the specific drug responsible for the adverse effect is not documented.
• The "D" seventh character indicates a subsequent encounter for care after the initial treatment phase.