As akp identified IEC 60601-1-2 is partially recognised by FDA. The one bit they do not recognise (IIRC) is the exemption of SIP/SOP cales less than 3m long from the conducted immunity tests. That is, all such cables, whatever length must be tested.
That particular test is (probably?) unlikely to be problematic. But I can well imagine a FDA reviewer homing in on that clause and checking to see whether that IEC exemption had been invoked. Recommendation - if you intend to 510(k) your device make sure ALL SIP/SOP cables get fully tested.
I do not know how this fits into ANSI standards; I can only surmise that this national deviation would be implemented.