Toxic effect of harmful algae and algae toxins, undet, init

This code signifies a patient presenting with adverse health effects resulting from exposure to harmful algae or their toxins, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined at the time of encounter. The patient exhibits symptoms consistent with toxic exposure, but the circumstances surrounding the contact are unclear.

Apply this code when a patient presents with symptoms such as gastrointestinal distress, neurological symptoms, skin irritation, or respiratory issues after exposure to water or food suspected of containing harmful algal blooms or their toxins, and the provider cannot ascertain if the exposure was accidental, intentional, or assault. This code is appropriate for the initial visit for such an undetermined toxic effect.

• Ensure documentation clearly states the toxic effect is due to harmful algae or algae toxins and that the intent is undetermined.
• Do not use this code if the intent (accidental, intentional self-harm, assault) is known; instead, select the appropriate intent subcategory.
• The "A" seventh character indicates an initial encounter for this condition. Subsequent encounters would require different seventh characters.