The terms pneumonia and pneumonitis are often used interchangeably. In SNOMED CT, pneumonia should be used for infectious causes, and pneumonitis should be used for noninfectious causes.
Pneumonia is a type of pneumonitis, as inflammation is present in both. The distinguishing feature between the two disorders is the presence of infection in pneumonia. Pneumonia should have a pathological process of infectious process, pneumonitis should not.
Consolidation is a feature of most forms of pneumonia. It may not be a feature of some atypical pneumonias, e.g. mycoplasma pneumonia.
Except as noted above, the morphologic abnormality for 233604007 |Pneumonia (disorder)| is 707496003 |Inflammation and consolidation (morphologic abnormality)|.
The morphologic abnormality for 205237003 |Pneumonitis (disorder)| is 409774005 |Inflammatory morphology (morphologic abnormality)|.
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