Adverse effect of antiasthmatics, subsequent encounter

This code signifies a patient experiencing an unintended and harmful reaction to medication prescribed for asthma or other respiratory conditions, during a follow-up visit. The adverse effect is not due to an overdose or poisoning, but rather a side effect occurring at therapeutic dosages.

Apply this code when a patient presents for ongoing management or evaluation of an adverse reaction to an antiasthmatic drug, after the initial treatment for the adverse effect has already begun. This includes situations where the patient is being monitored for resolution of symptoms or adjusting their medication regimen due to the adverse effect.

• Requires a primary code identifying the specific manifestation of the adverse effect (e.g., rash, tachycardia).
• Ensure documentation clearly indicates the encounter is for follow-up care related to the adverse effect, not the initial presentation.
• Distinguish from poisoning (T36-T50 with 5th or 6th character 1-4) or underdosing (T36-T50 with 5th or 6th character 6).