For example: char a; a= getchar(); The function getchar() reads a single character from the standard input device, the keyboard being assumed because that is the standard input device, and assigns it to the variable a.
This excludes acute and chronic respiratory failure (518.84), acute respiratory distress (518.82), acute respiratory failure following trauma and surgery (518.51), chronic respiratory failure (518.83), respiratory arrest (799.1), and respiratory failure, newborn (770.84). This applies to respiratory failure NOS.
When a patient was admitted in respiratory failure due to/associated with congestive heart. failure (CHF), CHF was sequenced as the principal diagnosis until discharges of April 20, 2005, when the respiratory failure guidelines were revised. A patient with CHF is admitted to the hospital for acute respiratory failure. The principal. diagnosis is acute respiratory failure, 518.81, and the secondary diagnosis is CHF, 428.0. The principal diagnosis depends on the reason for admission.