In general, they are right.
The working aged provisions of COBRA/TEFRA apply to employers of 20 or more employees. CMS requires the health plan be primary for medicare eligible employees/dependents. The provisions don't apply to employers with less than 20 lives. I'd say most employers like this arrangement since they're usually charged a lower rate for the medicare secondary or "carve-out" coverage.
This all should have been covered when you enrolled in the new plan. There is usually a space on the employee application where they're asked about both Medicare A & B enrollment. And, normally, as above, there is a significantly lower rate for medicare eligible employees.
I'm not sure what recourse you have. First, are they charging you a lower rate for the reduced coverage?. If not, I'd find out why. You may have an argument to make if there is no rate difference.
Because it is a "trust", complicates matters. You could still complain to the your state Dept. of Insurance. Depending on how the plan is being marketed/administered, they may be able to bring some pressure to bear.
Check with the local social security office. They can tell you when this employee can sign up for Part B. They've probably experienced this with other employers and may have some guidence.
QUOTE (PGBenefits @ Mar 9 2006, 04:42 PM)

Can someone help a newbie? My firm has a new group health plan. It is an ERISSA filed Trust and I am in Washington state if that matters.
Our certificate booklet says that for firms of less then 20 employees (like ours) the plan is going to pay claims for those employees over age 65 with Medicare primary. It assumes that employees over age 65 have Medicare A & B.
I have an employee who never signed up for Medicare B. He is still an active employee. I don't think our old plan had this provision. Can the carrier do this? My employee had a claim where the carrier paid secondary but since employee doesn't have Medicare B carrier is saying he is responsible for all the costs med B would have paid.
Is the carrier right? I don't know where to start researching can someone give me some direction?