Compensatory emphysema

Compensatory emphysema refers to the hyperinflation of lung tissue that is otherwise healthy, occurring in response to a loss of volume or function in another part of the lung. This condition is a physiological adaptation where unaffected lung segments expand to fill the space left by diseased or surgically removed lung tissue, maintaining overall lung capacity. It is not a primary disease process but a secondary change.

This code is appropriate when documentation specifies hyperinflation of healthy lung tissue as a compensatory mechanism. Common scenarios include post-pneumonectomy, lobectomy, or in cases of significant atelectasis or fibrosis in an adjacent lung area. Documentation should clearly indicate the compensatory nature of the emphysema, distinguishing it from primary emphysematous disease.

• Differentiate from primary emphysema (e.g., centrilobular, panlobular) which involves destructive changes to alveolar walls.
• Always sequence this code after the underlying condition or surgical history that necessitated the compensatory change.
• Ensure documentation explicitly uses terms like "compensatory hyperinflation" or "compensatory emphysema" to support code assignment.