Bloomberg joined Senators Schumer and Gilibrand and other leaders along with first responders and 9-11 family members.
They are lobbying Republican senators to pass the legislation.
The House has already approved the seven-point-four billion dollar bill.
The bill would cover the health problems suffered over the years by thousands of first responders. A number of Republican Senators say the bill is too expensive and it covers too many people who aren't sick or who can get other health insurance.
Senator Mitch McConnell, the Republican leader from Kentucky, has balked at supporting the bill. But when he ran for reelection two years ago, McConnell touted his support for a similar law that compensated sick "patriots" from "his state," people who had worked to build America's nuclear arsenal during the Cold War.
The lame duck session of Congress has plenty of unfinished business, and the reality of a Republican majority in the House comes in the new year. Supporters of the 9/11 bill feel that if it doesn't pass now, it will never have the necessary support.