Poisn by unsp sys anti-infect and antiparastc, undet, sqla

This code indicates a long-term effect or complication resulting from an undetermined poisoning involving an unspecified systemic anti-infective or antiparasitic medication. The original poisoning event's intent (accidental, intentional self-harm, assault) could not be determined. The "sequela" aspect signifies that the patient is presenting for treatment of a residual condition directly attributable to the past poisoning.

Apply this code when a patient presents with a chronic or residual health problem clearly documented as a consequence of a prior poisoning by an anti-infective or antiparasitic drug, and the circumstances of that poisoning were never established. This is appropriate for follow-up care or management of lasting damage after the acute phase of the poisoning has passed.

• Always ensure documentation explicitly links the current condition to a past poisoning event.
• Verify that the specific anti-infective or antiparasitic agent was not identified, and the intent of the poisoning remains undetermined.
• The "S" in the 7th character indicates sequela; do not use for initial or subsequent encounters for the acute poisoning itself.