Poisoning by oth vaccines and biolg substnc, undet, sequela

This code signifies a long-term or residual effect resulting from a past poisoning event involving a vaccine or other biological substance, where the intent of the poisoning (accidental, intentional self-harm, assault) cannot be determined. It indicates that the acute phase of the poisoning has resolved, but the patient continues to experience health problems directly attributable to that exposure.

Use this code when documenting a chronic condition or permanent injury that is a direct consequence of a previous, unspecified poisoning by a vaccine or biological substance. This applies when the original poisoning event is no longer active, and the patient is being treated for the lasting sequelae. Examples include persistent neurological deficits or organ damage clearly linked to such an exposure.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., a code for chronic kidney disease if that's the sequela).
• Ensure documentation clearly links the current condition to a past poisoning by a vaccine or biological substance, and explicitly states the intent is undetermined.
• Avoid using this code for acute poisoning events; it is strictly for residual effects.