One of the key projects is an effort to strengthen the company's relationship with physicians.

The Insured Retirement Institute's new public letter raises questions about what the House might do next.

"The combination of record account balances, strong savings behaviors and effective plan design tell an encouraging story about how Americans are approaching retirement," said Sharon Brovelli, president of workplace investing at Fidelity Investments. 

The benefits can also help fill the gaps created by shrinking major medical coverage, insurers say.