Quoting the FedRAMP official FAQ:
FedRAMP requirements include additional controls above the standard NIST baseline controls in NIST SP 800-53 Revision 4. These additional controls address the unique elements of cloud computing to ensure all federal data is secure in cloud environments.
However when I download the list of controls via the Official Fedramp Website (see this for "HIGH", and similar links for the other levels), I get what looks like the NIST 800-53 controls. Depending on the FedRAMP impact level, a subset of the NIST controls are selected.
So, what are those "additional controls above the NIST baseline"? I can’t find those on the web.