WASHINGTON  President Obama, whose vilification of insurers helped push a landmark health care overhaul through Congress, warned industry executives at the White House on Tuesday not to use the bill “as an opportunity to enact unjustifiable rate increases that don’t boost care and inflate their bottom line.”

Mr. Obama made his remarks in the East Room of the White House after a private meeting with executives of leading health insurance companies and with state insurance commissioners who regulate them. As the new law is being implemented, the White House wanted to issue a pointed reminder to insurers  and the public  that the president intends to monitor the industry’s behavior.

“There are genuine cost drivers that are not caused by insurance companies,” Mr. Obama said. “But what is also true is that we’ve got to make sure that this new law is not being used as an excuse to simply drive up costs.”

Mr. Obama convened the White House session mark the 90th day (Tuesday was actually the 91st) since he signed the health bill into law. He also used the occasion to unveil what his administration is calling “a new Patient’s Bill of Rights”  a set of regulations governing how the industry implements some of the most consumer-friendly provisions of the health care bill.