Have mon-thurs stays for 6 weeks stay upcoming near Los Angeles.

Client has received a 'group code' from Hilton, but there is concern among some of us that the usage of this 'group code' (which is a reduced rate) will somehow 'disallow' the ability for those of us which are Diamonds to be able to receive complimentary upgrades.

Anybody know if this is the case? Or will Diamond complimentary upgrades be processed/offered regardless of 'group code' / reduced rates?