2025 ICD-10-CM code T40.8X4D

Poisoning by lysergide [LSD], undetermined, subsequent encounter.

Use a secondary code from Chapter 20 (External causes of morbidity) to indicate the cause of the injury, if known.Use an additional code to identify any retained foreign body, if applicable (Z18.-).

Medical necessity is established by the signs, symptoms, and clinical findings related to LSD poisoning that require medical attention.

The clinician is responsible for documenting the patient's signs, symptoms, and history related to the LSD poisoning, including any related medical treatment provided.

In simple words: This code refers to a follow-up visit for a patient who experienced harmful effects from an unknown amount of LSD, and the circumstances surrounding the exposure are unclear.

Poisoning by lysergide [LSD], undetermined, subsequent encounter. This code should be used for subsequent encounters for poisoning by LSD when the intent (accidental, intentional self-harm, assault, or undetermined) is unknown.

Example 1: A patient is brought to the emergency department after exhibiting erratic behavior and hallucinations. It is suspected they ingested LSD, but the circumstances are unclear. After the initial visit (coded with T40.8X4A), the patient returns for follow-up care. The subsequent visit would be coded as T40.8X4D., A patient is found disoriented and confused. They admit to using LSD, but the timing and quantity are unknown. This is their second visit related to this incident. The subsequent encounter is coded T40.8X4D., A patient is admitted for observation after experiencing adverse effects suspected to be related to LSD use. It's unclear how or when the LSD was taken. After the initial encounter, the patient is seen for follow-up visits. These subsequent visits would be coded as T40.8X4D.

Documentation should support the diagnosis of LSD poisoning and indicate that this is a subsequent encounter related to the same poisoning incident. The documentation should include the patient's symptoms, vital signs, and any treatment provided. Information regarding the circumstances of the poisoning, if available, should also be noted.

** The 7th character 'D' indicates a subsequent encounter. This code is used when the intent of the poisoning is undetermined.

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