Undrdose of multiple unsp drug/meds/biol subst, sequela

This code signifies a patient experiencing a long-term or residual effect from not receiving enough of multiple, unidentifiable medications, drugs, or biological substances. The original underdosing event is no longer acute, but its lasting consequences are still present.

Use this code when documenting conditions that are a direct result of a past underdosing of several unspecified substances, and the underdosing itself is no longer the primary issue. This is appropriate for chronic conditions or permanent disabilities stemming from such an event.

• Always ensure the documentation clearly links the current condition to a previous underdosing event.
• This "S" seventh character indicates a sequela, meaning the residual effect of a past condition.
• Avoid using this code for acute underdosing; instead, use the appropriate acute underdosing code without the "S" seventh character.