Upon taking office, White House Chief of Staff Rahm Emanuel called for a regulatory review that included ICD-10 and related transactions. That review is complete and the regulations stand as originally issued.
The March 5th notice from CMS states that "a determination has been made that the effective date will not be extended and the comment period will not be reopened for either of these rules. The first rule finalizes new code sets to be used for reporting diagnoses and procedures on health care transactions. This final rule replaces the ICD-9-CM code sets, developed nearly 30 years ago, with greatly expanded ICD-10 code sets. The second final rule adopts updated versions of the standards governing electronic transactions under the authority of HIPAA. The updated versions replace the current standards and will promote greater use of electronic transactions... The final rules provide compliance dates of Jan. 1, 2012 for the transaction standards and Oct. 1, 2013 for the ICD-10 code set."
For a more in-depth review of regulations, see ICD-10: No Time to Relax.