Adverse effect of mult unsp drug/meds/biol subst, sequela

This code signifies a long-term or residual condition resulting from an adverse reaction to a combination of various, unidentifiable drugs, medications, or biological substances. The original adverse effect has resolved, but a lasting health problem remains.

Apply this code when a patient presents with a chronic or permanent health issue directly attributable to a past adverse drug event involving multiple, unspecified agents. This is appropriate when the specific substances causing the original adverse effect cannot be determined, and the patient is no longer experiencing the acute phase of the reaction.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past adverse drug event involving multiple, unspecified substances.
• Avoid using this code for acute adverse reactions; it is exclusively for sequelae.