Pneumopericardium originating in the perinatal period

This code signifies the presence of air or gas within the pericardial sac, specifically when the condition arises during the perinatal period (from 22 weeks gestation through the first 28 days of life). It indicates a congenital or birth-related accumulation of air around the heart.

Apply this code for newborns or infants diagnosed with pneumopericardium where the onset is documented as occurring at or shortly after birth. Documentation should clearly state the presence of air in the pericardium and specify its perinatal origin, often identified through imaging studies like chest X-rays.

• Ensure documentation explicitly states "perinatal" or "congenital" origin to differentiate from acquired pneumopericardium in older individuals.
• Do not confuse with pneumothorax (air in the pleural space) or pneumomediastinum (air in the mediastinum), though these may co-occur.
• Always sequence this code as a principal diagnosis if it is the primary reason for admission or encounter, or as a secondary diagnosis if it is a co-morbidity.