A number of large corporations, including Walt Disney Co., Harrah's Entertainment, Dow Chemical Co., Toyota Motor Corp., Pitney Bowes Inc., now offer on-site clinics as a way to improve their employees' health, cut medical costs and reduce the amount of time workers spend out of the office for doctor appointments. Virtually all large employers are self-insured, meaning they pay for medical care themselves and can reap the benefits of a healthier employee population. Nearly 30% of large employers had a clinic on campus or planned to open one by 2009.