The survey, commissioned by the network and conducted by KRC Research, showed a majority of seniors report feeling better off than they were before and that they are saving money.
The network, a coalition of 79 national organizations, is led by former U.S. Sen. John Breaux, D-La.
The telephone survey of 896 people age 65 and older who are enrolled in Medicare Part D was conducted March 15-20 and has a margin of error of 3.27 percentage points.
"The survey shows that seniors who have enrolled are finding the benefit worth the time and effort that it takes to check out the plans and sign up," said Breaux in a statement.
Notable deaths of 2014 [PHOTOS]