A lesion is any abnormal damage or change in the tissue of an organism, usually caused by disease or trauma. Lesion is derived from the Latin word laesio meaning injury. Lesions may occur in plants as well as animals.
These first six months are known as the length-of-stay demonstration period. After maintaining a Medicare ALOS of 25 days for six months, Landmark Hospital applies to CMS for a change in provider status and receives a LTAC-hospital Medicare provider number.
editor's note: Although isoniazid for nine months is the preferred treatment for LTBI, the Centers for Disease Control and Prevention lists four months of rifampin as an acceptable alternative.1 However, few well-controlled trials have examined this option.