Counting Unique combinations of two variables

Good Morning. I'm working on a data set that lists medical procedure codes priced by different vendors. I want to do my analysis only on procedure codes that each of the vendors has provided pricing information for and have it ignore duplicates. For instance, if the same vendor listed the same procedure code and price twice, it only counts unique instances. My goal, is to have a column that indicates how many unique combinations of code and vendor there are in the data set, so I can sort on those to be the only ones I analyze. I've attached a file as an example with the highlighted column the results I'm trying to produce. For instance, Vendors A, B & C each price CPT code 200 at least once, Vendor A prices it twice, but I want the formula to only return 3 for # of unique combinations which tells me each vendor priced this code and therefore I will include it in my analysis.

Hopefully I've provided enough information for someone to help me, I've wasted far too much time on this. Thanks in advance for your help!!!