Toxic effect of herbicides and fungicides, undet, subs

This code signifies a toxic reaction to herbicides or fungicides where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is presenting for follow-up care after the initial treatment of the poisoning.

Apply this code for patients receiving ongoing care, such as monitoring, rehabilitation, or treatment for residual effects, following an initial acute poisoning from herbicides or fungicides. This is appropriate when the documentation clearly states the intent of exposure is unknown and the encounter is not for the initial presentation.

• Ensure documentation explicitly states "undetermined" intent for the toxic exposure.
• Confirm the encounter is for subsequent care, not the initial treatment of the poisoning.
• Always sequence this code after any codes for the specific manifestations of the toxic effect.