Underdosing of unspecified psychodysleptics, sequela

This code signifies the long-term consequences or complications arising from the insufficient use or cessation of an unspecified hallucinogenic substance. It indicates that a patient is experiencing residual health issues directly attributable to the underdosing of such a drug.

Apply this code when documenting a patient presenting with chronic physical or psychological conditions that are a direct result of not taking enough or stopping an unspecified hallucinogen. This is appropriate for follow-up care for conditions like persistent psychosis, flashbacks, or other lasting impairments linked to the underdosing event.

• Always use this code as a secondary diagnosis, following the primary condition it describes.
• Ensure documentation clearly links the current sequela to a past underdosing event of an unspecified hallucinogen.
• A seventh character "S" indicates sequela, meaning the residual effects of a past injury or illness.