Adverse effect of therapeutic gases, subsequent encounter

This code signifies a harmful or unintended reaction experienced by a patient due to the therapeutic administration of medical gases. This adverse effect is occurring during a follow-up visit or after the initial treatment for the reaction has begun.

Apply this code when documenting ongoing care for a patient who previously experienced an adverse reaction to medical gases like oxygen, nitrous oxide, or helium, and is now presenting for subsequent management of that reaction. This includes situations where the patient is being monitored, receiving further treatment, or experiencing persistent symptoms related to the initial adverse event.

• Always sequence this code after the code(s) for the specific manifestation of the adverse effect.
• Ensure the documentation clearly indicates the therapeutic nature of the gas administration and that the encounter is not the initial treatment for the adverse effect.
• Do not use this code for poisoning or underdosing of therapeutic gases.