Expsr to rdct in atmos pressr wh surfc fr dp-watr div, subs

This code signifies a patient's exposure to a rapid decrease in atmospheric pressure during the ascent phase of deep-water diving, leading to potential decompression sickness or other barotrauma. It specifically indicates that this is not the initial presentation but a follow-up or subsequent encounter for the effects of this exposure.

Use this code for patients presenting for ongoing management, evaluation of persistent symptoms, or complications arising from a deep-water diving incident involving rapid ascent. This applies when the initial treatment or diagnosis has already occurred, and the patient is returning for further care related to that specific event.

• Always sequence this code after the definitive diagnosis for the specific condition(s) resulting from the pressure reduction (e.g., decompression sickness, barotrauma).
• Ensure the "D" seventh character is appropriate for a subsequent encounter; "A" is for initial encounters and "S" for sequela.
• Document clearly the link between the current visit and the prior deep-water diving incident.