Toxic effect of contact w venom marine plant, undet, sequela

This code signifies the long-term or residual effects resulting from exposure to a venomous marine plant, where the intent of the exposure (accidental, intentional self-harm, assault) cannot be determined. These sequelae could include chronic skin lesions, persistent pain, or other lasting systemic issues that developed after the initial toxic reaction.

Apply this code when documenting a patient presenting with a chronic condition or complication directly attributed to a past encounter with a venomous marine plant, and the medical record does not specify whether the exposure was accidental or intentional. This is appropriate for follow-up visits addressing these lasting effects, not the initial acute injury.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic dermatitis).
• Ensure documentation clearly links the current condition to a past venomous marine plant exposure.
• Only use the "S" seventh character for sequela when the acute phase of the toxic effect has passed and the patient is being treated for the residual effects.