Is anyone out there using the AQ modifier in order to get the HPSA bonus? Is it as simple as looking up the address and if it states designated then you add the modifier to the claims for that location? I am finding it impossible to find someone to speak to on the phone about this. Any help would be appreciated. I know there is a zip code file and it appears none of ours are on there but when you plug in their location address it states designated on the primary care. Is it that simple? We do radiology, anesthesia, and nursing home physician billing. Please help???