Adverse effect of agents prim acting on the resp sys, subs

This code indicates a patient is experiencing an unintended and harmful reaction to a medication or substance that primarily affects the respiratory system, during a follow-up visit for the adverse effect. The initial treatment for the adverse effect has already been provided, and the patient is now receiving ongoing care.

Apply this code when documenting subsequent encounters for adverse effects from respiratory agents like bronchodilators, antihistamines, or decongestants, where the specific agent is not otherwise classified. This includes follow-up appointments for managing persistent symptoms, monitoring recovery, or adjusting treatment related to the adverse reaction.

• Always sequence the adverse effect code first, followed by codes for the specific manifestations of the adverse effect.
• Ensure the documentation clearly indicates this is a subsequent encounter for the adverse effect, not the initial treatment.
• Verify that the agent causing the adverse effect is not more specifically classified elsewhere in the T36-T50 range.