Number of calendar days a patient remains in a health care facility or is an inpatient in the hospital during an episode of illness or due to an injury. LOS statistics report the average number of days spent in a health care facility per admission and discharge. Also referred to as average length of stay, days of stay, discharge days, duration of inpatient hospitalization , and inpatient days of stay .

Type of group insurance in which an employee is insured for an amount dependent on the length of time he or she has been employed for the employer.

Type of cases that fall outside, either longer or shorter than typical, from the average for a specific diagnosis, procedure, or diagnostic-related group.

Curved transparent pieces of plastic or glass that are shaped, molded, or ground to refract light in a specific way, as in eyeglasses, microscopes, or cameras. Corrective lenses may be prescribed by an ophthalmologist or optometrist to improve vision.