Adverse effect of therapeutic gases, sequela

This code signifies a long-term or residual condition resulting from an adverse reaction to therapeutic gases administered for medical purposes. It indicates that the initial acute adverse effect has resolved, but a lasting health problem persists as a direct consequence.

Apply this code when documenting a chronic or permanent sequela, such as persistent lung damage, neurological deficits, or organ dysfunction, directly attributable to a past adverse event involving therapeutic gases. This is used when the patient is presenting for treatment or evaluation of the enduring complication, not the acute event itself.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current chronic condition to a prior adverse effect of therapeutic gases.
• Do not use for acute adverse effects; refer to the appropriate acute T41.5X codes for those situations.