Underdosing of other psychodysleptics, sequela

This code indicates a long-term or residual effect stemming from the insufficient administration or cessation of hallucinogenic substances. These sequelae are persistent conditions that arise after the acute phase of underdosing has passed. Examples might include chronic psychological disturbances or neurological deficits.

Apply this code when documenting a patient presenting with a current, lasting health problem directly attributable to a past instance of underdosing or withdrawal from hallucinogens. This is appropriate for conditions that are no longer acute but are a direct consequence of the prior underdosing event.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past underdosing of hallucinogens.
• Do not use for acute underdosing or withdrawal symptoms; those require different codes.