This excerpt taken from the UNH 10-K filed Mar 6, 2007.
Business Organization Changes
Consistent with the structural changes to the Companys executive management, we began transitioning our operating structure into the following three new market groups in 2007:
This initial operating structure will continue to evolve as we add new executive positions and realign enterprise-wide functions to strengthen our capabilities and performance. We have not currently realigned assets or changed the way our senior executives evaluate financial performance. Therefore, until we have completed the transition of our operating structure into the new market groups, we will continue to describe and report our results of operations in our earnings releases and SEC filings (including this Form 10-K) using the four business segments described in Overview above.