| Abbreviation | Definition |
| DRG | Diagnosis-related groups |
| G-DRG | German diagnosis-related groups |
| HAP | Hospital-acquired pneumonia |
| ICU | Intensive care unit |
| InEK | German Institute for Remuneration in Hospitals |
| MDR-GNB | Multidrug-resistant Gram-negative bacteria |
| OPS | Operation and procedure |
| RKI | Robert Koch-Institute |
| VAP | Ventilator-associated pneumonia |
| vHAP | Hospital-acquired pneumonia requiring mechanical ventilation |