Poisoning by oth drug/meds/biol subst, undetermined, init

This code signifies an adverse event resulting from exposure to a drug, medication, or biological substance where the intent (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is experiencing the initial phase of treatment for this poisoning.

Apply this code when a patient presents with symptoms of poisoning due to a drug, medication, or biological substance, and the medical documentation does not clearly state whether the exposure was accidental, intentional, or due to assault. This is used for the first encounter for this specific poisoning event.

• Always sequence this code first when it is the primary reason for the encounter.
• Do not use if the intent of the poisoning (accidental, intentional, assault) is documented.
• Requires an additional code for the specific drug or substance if known (e.g., from categories T36-T50).