Medical plan costs are predicted to grow at double-digit rates in the next year, according to Aon Consulting's 2010 Health Care Trend Survey, which interviewed more than 60 health care insurers, representing more than 100 million insured individuals. Aon Consulting has determined health care costs are expected to rise by 10.5 percent for HMOs, 10.6 percent for POS plans, 10.7 percent for PPOs and 11 percent for CDH plans - a slightly higher rate than last year's increases of 10.4 percent for HMOs, 10.4 percent for POS plans, 10.7 percent for PPOs and 10.5 percent for CDH plans.

In the next year, Aon Consulting forecasts an 8.4 percent prescription drug cost trend, a decrease from 9.3 percent in the spring of 2009, and a 14 percent specialty pharmacy trend rate is expected, rather than last year's lower 13.2 percent.

For retirees over the age of 65, health care rates are projected to hit 7.5 percent for Medicare Supplement plans and 6.7 percent for Medicare Advantage plans, Aon Consulting says, which is up from 6.6 percent and down from 7.3 percent from the spring of 2009.