Rx deductible and Grandfathered Status

[SLuskin]

I am looking for some guidance here. Plan renewal date is December 1, 2010. The client is renewing a plan with exactly the same provisions as last year except for 1 thing. Instead of Rx copay $15,$25,$40, it is now $100 Rx deductible and then $15,$25,$40.

I know the deductible can go up 15% plus medical inflation. But what if the current deductible is zero?

They would like to keep their grandfathered status, even though they do not have any discriminatory practices. Everyone has the same entry date, same % of premium paid across the board, no one excluded once probationary period has been met.

Thank you.