Caisson disease [decompression sickness], initial encounter

This code represents a condition caused by a rapid decrease in ambient pressure, leading to the formation of gas bubbles (primarily nitrogen) in the body's tissues and bloodstream. These bubbles can cause a variety of symptoms, ranging from mild joint pain ("the bends") to severe neurological impairment, respiratory distress, and even death.

Use this code for the initial encounter of a patient presenting with symptoms of decompression sickness, typically following diving, high-altitude exposure, or working in pressurized environments (e.g., caissons). This includes cases where the patient is being evaluated, diagnosed, or beginning treatment for the acute effects of the pressure change.

• Ensure the documentation clearly indicates this is the initial encounter for the condition.
• Look for specific details in the medical record regarding the precipitating event (e.g., diving depth, ascent rate, altitude).
• Consider co-reporting with codes for specific manifestations, such as neurological deficits or joint pain, if documented.