WASHINGTON — Health insurance companies are lobbying federal and state officials in an effort to ward off strict regulation of premiums and profits under the new health care law.

The effort is, in some ways, a continuation of the battle over health care that consumed Congress last year.

Insurance lobbyists are trying to shape regulations that will define “unreasonable” premium increases and require them to pay rebates to consumers if the companies do not spend enough on patient care.

For their part, consumer groups say they worry that their legislative victories could be undone or undercut by the rules being written by the federal government and the states.