Link to USCIS article
May 20, 2009 Memorandum on Requirements for H1-B benificiaries seeking to practice in a health care occupation.
USCIS is denying applications, and they admitted they made a mistake. Due to the U.S. economy, and unemployment at an all time high, I suspect this is actually a ploy by the U.S. government to frustrate employers into hiring U.S. workers.