Poisoning by therapeutic gases, accidental, sequela

This code signifies a long-term complication or residual effect resulting from an accidental overdose or adverse reaction to therapeutic gases. These gases are typically administered for medical purposes, such as anesthesia or respiratory support, and the sequela indicates a lasting health problem rather than the acute event itself.

Apply this code when documenting a condition that is a direct consequence of a past, unintentional poisoning by a therapeutic gas. Examples include chronic respiratory issues, neurological damage, or other persistent health problems that developed after the initial poisoning event has resolved. This code is used for the sequela, not the initial poisoning.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic bronchitis, anoxic brain damage).
• Ensure documentation clearly links the current condition to a past accidental therapeutic gas poisoning.
• The "S" in the 7th character indicates sequela, meaning the patient is seen for the residual effects of the poisoning.