Interstitial emphysema

This code represents the presence of air within the interstitial tissues of the lung, outside of the normal alveolar spaces. This condition can occur when air leaks from the alveoli or airways into the surrounding connective tissue. It is often a complication of barotrauma or other lung injuries.

Use this code when documentation clearly indicates the presence of interstitial emphysema, such as findings on chest imaging (e.g., CT scan, X-ray) or during surgical exploration. This condition is frequently seen in neonates on mechanical ventilation or in adults following trauma or vigorous coughing.

• Differentiate from subcutaneous emphysema, which involves air in the subcutaneous tissues.
• Consider sequencing this code as a secondary diagnosis if it is a complication of another primary condition (e.g., mechanical ventilation, trauma).
• Ensure documentation specifies "interstitial" to avoid confusion with other forms of emphysema.