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Our hospital bill our labs from the clinics out. They bill them out on a ub, so everything gets processed with the first diagnosis, even though we have multiple labs all with a different diagnosis code? Not sure, how to fix this.
That sounds like a payer issue, not something you would have any control over. The UB-04 form can accommodate up to 25 diagnosis codes, and there is no linking of charges with diagnosis codes on this form. As long as there is a diagnosis that supports the lab service, it should not matter if is it first or not - the payer should recognize it. If the payer is processing all labs with only one diagnosis, then that is the payer's error and you'll need to work with them to sort this out.