Poisoning by lysergide [LSD], undetermined, sequela

This code signifies a long-term consequence or residual effect stemming from a past poisoning event involving lysergide (LSD), where the intent of the poisoning (e.g., accidental, intentional self-harm, assault) could not be determined. It indicates that the acute phase of the poisoning has resolved, but the patient is now experiencing a chronic or lasting health problem directly attributable to that exposure.

Use this code when documenting a patient presenting with a current health condition that is a direct and lasting result of a previous LSD poisoning, and the original poisoning event's intent was not specified or could not be ascertained. This applies to follow-up encounters for chronic neurological, psychological, or other sequelae.

• Always use this code as a secondary diagnosis, following the code for the specific sequela being treated (e.g., chronic psychosis, persistent perceptual disorder).
• Ensure documentation clearly links the current condition to the past LSD poisoning and specifies that the intent of the original poisoning was undetermined.
• Do not use this code for acute LSD poisoning; instead, use the appropriate acute poisoning code from the T40.8X1-T40.8X4 series.