According to the American Thoracic Society (ATS) in 2018, 1 million patients required hospitalization for pneumonia and there were 50,000 associated deaths. Pneumonia was the leading cause of sepsis and septic shock and not surprisingly therefore qualified in the top 10 most expensive inpatient hospitalizations.(1) Given these findings, some have sought opportunity to develop mechanisms to assess and safely triage pneumonia patients to either inpatient or outpatient treatment strategies based upon pneumonia severity scores. In October 2019, the Infectious Diseases Society of America (IDSA) in conjunction with the ATS published recommendations for the assessment, treatment and disposition of immunocompetent adult patients with community acquired pneumonia which included several clinical decision rules also known as pneumonia severity scores.(2) The recommended decision rules and several associated, emerging tools are reviewed here.