I worked for a DME provider for many years and splitting claims was often necessary. (Keep in mind though, I was billing HCPCs not CPT.)
Some examples:
A patient gets a wheelchair and a hospital bed on the same DOS. About 90% of (Medicare) claims for hospital beds go through a pre-payment audit. If the wheelchair and the bed are on the same claim, then payment for the wheelchair gets postponed until the audit for the bed is completed.
A patient gets a replacement CPAP at the same time as he gets replacement CPAP supplies. The machine gets audited and, again, your supplies get hung up on the audit.
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I called Medicare at one point, to ask about the payment being held up for the wheelchair and it was actually her suggestion that we split the claims, however, if you have had any experience with Medicare, you know that you often get a different answer each time you call. It used to make me crazy when CS would forget to split those claims, because you can't undo it and it would make our aging all wonky.