Tidal wave due to earthquake or volcanic eruption, subs

This code indicates an injury or health condition resulting from a tidal wave that was caused by an earthquake or volcanic eruption, specifically when the patient is seen for follow-up care after the initial treatment. It signifies that the patient is beyond the initial acute phase of treatment for the tidal wave-related injury.

This code is appropriate for subsequent encounters where a patient is receiving ongoing care, such as rehabilitation, wound care, or management of chronic conditions, stemming from injuries sustained during a tidal wave caused by seismic or volcanic activity. It would be used for visits after the initial emergency treatment or hospitalization.

• Always pair this external cause code with a primary diagnosis code describing the specific injury or condition being treated.
• Ensure the encounter is truly "subsequent" and not an initial presentation or active treatment for an acute injury.
• Verify the tidal wave's origin was explicitly due to an earthquake or volcanic eruption, as other causes have different external cause codes.