Adverse effect of cannabis, sequela

This code signifies a long-term or residual condition resulting from a past adverse reaction to cannabis use. It indicates that the patient is experiencing ongoing health issues directly attributable to a previous negative effect of cannabis, even if the cannabis exposure itself is no longer occurring.

Apply this code when documenting chronic mental health conditions (e.g., persistent psychosis, severe anxiety disorders) or physical sequelae (e.g., chronic respiratory issues from inhalation) that are definitively linked to a prior adverse effect of cannabis. This code is appropriate when the acute adverse event has resolved, but its lasting consequences persist.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., F20.9 for schizophrenia).
• Ensure documentation clearly establishes a causal link between the past cannabis adverse effect and the current chronic condition.
• Do not use this code for acute adverse effects or for current cannabis dependence/abuse; those require different codes.