Adverse effect of other psychodysleptics, sequela

This code signifies a long-term or residual adverse effect resulting from the use of hallucinogenic substances. It indicates that the patient experienced a harmful reaction to these drugs, and the consequences of that reaction are still present and being treated after the acute phase has passed. This could include persistent psychological, neurological, or other physiological sequelae.

Apply this code when documenting a patient presenting with ongoing health issues directly attributable to a past adverse reaction to hallucinogens. This is appropriate for follow-up visits or when the sequela is the primary reason for the encounter, such as persistent psychosis, flashbacks, or other chronic conditions linked to the drug exposure.

• Always use in conjunction with a code describing the specific sequela (e.g., F20.9 for schizophrenia if persistent psychosis is the sequela).
• The "S" in the 7th character indicates a sequela, meaning the initial adverse effect has resolved, but its long-term consequences are being treated.
• Ensure documentation clearly links the current condition to a past adverse effect of hallucinogen use.