Format Those data elements that provide or control the enveloping or hierarchical structure, or assist in identifying data content of, a transaction. [45 CFR 162.103] Legislation Files Containing This Term: legislation/45CFR-160.103.html legislation/45CFR-162.103.html legislation/45CFR-162.930.html legislation/45CFR-164.524.html legislation/45CFR-164.530.html