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Medicare doesn't cover the preventative care E&M codes in ranges 9938x & 9939x, so your 99397 is not going to be covered. Also, modifier 59 is not appropriate for G0439 as it is a provider visit (technically it isn't an E&M but it is considered the same for modifier 25 & 59 purposes. You shouldn't require any modifier for G0439 since it is a column 1 code to code 99213 which you already have the 25 modifier appended to.