Toxic effect of contact w venomous marine plant, undet, init

This code signifies an adverse systemic reaction resulting from direct contact with a venomous marine plant, such as certain types of algae or seaweed. The specific type of marine plant responsible for the toxic effect is not identified in the medical record.

This code is appropriate for initial encounters where a patient presents with symptoms like skin irritation, nausea, or respiratory distress following exposure to an unknown venomous marine plant. It should be used when the documentation clearly indicates a toxic effect but lacks specificity regarding the causative agent.

• Requires a seventh character for encounter type; "A" denotes an initial encounter.
• Distinguish from allergic reactions, which would be coded differently.
• Ensure documentation specifies "undetermined" marine plant to justify this code.