Expsr to rdct in atmos pressr wh surfc fr underground, sqla

This code signifies the long-term or residual effects resulting from a patient's exposure to a rapid decrease in atmospheric pressure experienced during ascent from an underground environment. This typically refers to conditions that manifest after the initial acute phase of decompression sickness or barotrauma sustained in such circumstances.

Apply this code when documenting chronic or persistent health problems directly attributable to an incident of surfacing from underground with insufficient decompression. This includes conditions like avascular necrosis, neurological deficits, or pulmonary issues that develop weeks, months, or years after the initial pressure change event.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., M87.1x for avascular necrosis).
• Ensure documentation clearly links the current condition to a past exposure event involving surfacing from underground.
• The "S" in the 7th character indicates sequela; do not use for acute or initial encounters.