Poisoning by antiviral drugs, undetermined, sequela

This code indicates a long-term health condition or complication resulting from a past poisoning by an antiviral medication, where the intent of the poisoning (e.g., accidental, intentional self-harm, assault) could not be determined. The patient is no longer in the acute phase of the poisoning but is experiencing residual effects.

Apply this code when documenting a chronic or residual effect directly attributable to an antiviral drug poisoning that occurred in the past, and the circumstances surrounding the poisoning were unclear or could not be specified. This is appropriate for follow-up encounters addressing these lasting sequelae.

• Always sequence the code for the specific sequela (e.g., kidney damage, neurological deficit) first, followed by this sequela code.
• Ensure documentation clearly links the current condition to a past, undetermined antiviral drug poisoning.
• This "S" seventh character indicates a sequela, meaning the acute phase of the poisoning has passed.