Drown due to being washed overboard from unsp wtrcrft, subs

This code describes a patient presenting for follow-up care or sequelae related to a non-fatal drowning or near-drowning incident. The original event involved the individual being swept from an unidentifiable watercraft into the water. This code is used when the initial injury has already been treated.

Use this code for patients returning for treatment of complications such as pneumonia, neurological deficits, or psychological trauma stemming from a prior drowning incident where they were washed overboard from an unspecified vessel. It is appropriate for any encounter after the initial acute treatment.

• Ensure the documentation clearly indicates a "subsequent encounter" for the drowning sequelae.
• Confirm the mechanism of injury specifically states being washed overboard from a watercraft, even if the type of craft is unknown.
• Always code any specific sequelae (e.g., aspiration pneumonia, anoxic brain injury) in addition to this external cause code.