An increasing number of seniors who spend time in the hospital are surprised to learn that they were not "admitted" patients -- even though they may have stayed overnight in a hospital bed and received treatment, diagnostic tests and drugs. Because they were not considered sick enough to require admission but also were not healthy enough to go home, they were kept for observation care, a type of outpatient service. The distinction between inpatient status and outpatient status matters: Seniors must have three consecutive days as admitted patients to qualify for Medicare coverage for follow-up nursing home care, and no amount of observation time counts for that three-day tally.