CMS has delayed the non-enforcement 5010 period for another 90 days until 6/30/12. This allows payers and providers to legally conduct transactions in the 4010 format until this time. Despite this, some CMS payers still require 5010 format in order to process your electronic medical claims. This simply allows those that are still having problems, to continue in 4010 for a while longer.
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This mostly applies to some Medicaid programs which have already announced delays. Current compliance rates are over 90% for Medicare Part B and about 70%
When 4010 was introduced there were similar delays based on this compliance percentage. When Part A claims compliance exceeded 80%, CMS no longer extended the deadline. Based on this, I would not count on any additional extensions beyond June for Medicare Part A.