Community-acquired Pneumonia (CAP) is exactly what it sounds like—a lung infection acquired while out and about in the world. The cause may be a virus, bacteria, or fungus. (See CAP stats.) community acquired pneumonia cap stats The estimated cost of treating CAP in the United States is about $12.2 billion a year. Inpatient treatment ranges from $7,500 to $10,227 per admission, whereas outpatient treatment ranges from $150 to $350 per patient. This difference demonstrates the need for accurate diagnosis and appropriate treatment.