Toxic effect of unsp substance, undetermined, init encntr

This code signifies a patient presenting with adverse effects from an unidentified toxic substance, where the intent (e.g., accidental, intentional self-harm, assault) cannot be determined. It is used for the initial phase of treatment for such an exposure.

Apply this code when a patient exhibits symptoms of poisoning or toxic exposure, but the specific substance involved remains unknown after initial assessment. This is appropriate when the circumstances surrounding the exposure are also unclear or cannot be definitively categorized as accidental, intentional, or assault.

• Only use this code when both the substance and the intent are truly undetermined.
• Reserve the "A" seventh character for the initial encounter for care related to the toxic effect.
• Avoid using this code if a more specific substance or intent can be identified, even if only suspected.