One of the areas that has seen changes in the NPRM for meaningful use stage 2 includes the standards according to which health data is exchanged. In this case, the affected areas are related to clinical messaging, electronic prescribing, and patient summary and transport specifications.
Specifically, one of the standards has been substituted for another. In meaningful use stage 1, the selected standard was CCD/CCR (HITSP C32); however, in the new ruling this was replaced with consolidated CDA. The original standards (C32) included administrative and clinical information — registration, demographics, insurance, problem list, medication list, allergies, test results, etc.
One of the reasons the consolidated CDA was selected as the standard is due to its single implementation guide, as well as the centralization of many of its templates. These templates allow for more information to be exchanged amongst different clinical applications and systems.