On-site occupational health nurses are indispensible for companies that want to mitigate occupational health hazards, perform medical/biological surveillance and trend analyses, promptly and appropriately accomodate ill and impaired employees, and facilitate occupational reintegration of employees on WC/STD/LTD. When and as appropriate, OHN(s) in effect perform as nurse practitioners. By any outcome measure, "disability" experience ratings are much improved when OHN(s) are involved. Small or less complex companies that do not need full-time nurses can still achieve beneficial results with part-timers. For the financially minded, OHN's are cost-effective.