Poisn by multiple unsp drug/meds/biol subst, undet, sequela

This code indicates a long-term or residual effect resulting from a past poisoning event involving multiple, unidentified drugs, medications, or biological substances. The original intent of the poisoning (e.g., accidental, intentional) could not be determined at the time of the acute event. The sequela represents a condition that persists after the acute phase of the poisoning has resolved.

Apply this code when documenting a chronic condition or permanent injury directly attributable to a past poisoning by multiple, unspecified substances, where the intent of the original poisoning was undetermined. This is used for follow-up care or management of the lasting effects, not for the acute poisoning itself.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic kidney disease, neurological deficit).
• Ensure documentation clearly links the current condition to a past poisoning event and specifies the undetermined intent.
• Avoid using this code for acute poisoning; the "S" seventh character indicates a sequela.