UPDATE 2-Connecticut eyes HMO communication with customers

* Follows Medicare probe of Humana letter

* Request goes to state's top five health insurers

* 4 say sent no such letters

* 5th says yet to identify any such material (Adds company responses, byline)

By Lewis Krauskopf

NEW YORK, Oct 2 (Reuters) - The Connecticut attorney general is seeking information about what the state's five largest health insurers may have sent policyholders over legislation that would reform the Medicare program for the elderly.

The information requests announced on Friday follow a U.S. government probe announced last month into a letter sent from Humana Inc (HUM.N) to its Medicare members that caused a stir on Capitol Hill.

Connecticut Attorney General Richard Blumenthal wants information from Aetna Inc (AET.N), UnitedHealth Group Inc (UNH.N), Health Net (HNT.N), WellPoint Inc's (WLP.N) Anthem Health Plans unit and ConnectiCare Inc.

However, representatives of four companies -- Aetna, UnitedHealth, Health Net and ConnectiCare -- told Reuters they had not sent their Medicare members letters about health reform.