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

This code signifies an unintended and harmful reaction to a medication that primarily impacts the body's involuntary functions, such as heart rate, digestion, or breathing, when the specific drug causing the reaction is not identified. This adverse effect is occurring for the first time or is the initial phase of treatment for the reaction.

Use this code when a patient presents with symptoms like orthostatic hypotension, urinary retention, or severe dry mouth, and these symptoms are determined to be an adverse effect of a drug, but the specific drug responsible is unknown. This is appropriate for the initial visit where the adverse effect is diagnosed and treatment begins.

• Always sequence this code after the code for the specific manifestation of the adverse effect (e.g., orthostatic hypotension).
• Avoid using this code if the specific drug causing the adverse effect is known; instead, use the more specific T44.x codes.
• Ensure documentation clearly states an adverse effect and that the drug is unspecified, along with the "initial encounter" status.