Modifier 59- is used to identify procedure/services, other than E&M services, that are not normally reported together, but are appropriate under the circumstances. Documentation must support a different sesson, different procedure or surgery, differrent site or organ system, separate incision/exision, separate lesion or spearate injury not ordinally encountered or performed on the same day by the same individual. in other words you would only use this modifier when your are doing different procedures, not the same procedure.
Modifier 76, this modifier is used to indicate that a procedure or service was repeated by the same physicianor other qualfied health care professional susequent to the orignal procdure or service.
the definition of the modifiers are found in the back of the CPT® book as to how to correctly use them. if you have the CPT® 2014 book it is found on page 460. :)