The Supreme Court Monday reinforced the right of hospitals to challenge federal regulations limiting the amount of money they are reimbursed for treating Medicare patients.

Justice Anthony M. Kennedy wrote the unanimous opinion, his first since joining the court Feb. 18.Kennedy, in a case from Ohio, upheld the right of hospitals to contest unfavorable rules to a governmental agency called the Provider Reimbursement Review Board.

The board must hear the hospitals' challenge to regulations even if the hospitals previously abided by the rules in their own cost reports, Kennedy said.

In other action, the court:

Refused to block the Federal Trade Commission from investigating allegedly anti-competitive practices of state agencies that license and regulate professionals.

The court, without comment, let stand a ruling that FTC investigators may subpoena members of a Massachusetts board that regulates pharmacies in the state.

Rejected an appeal by Alaska natives who want to hunt migratory birds in the spring and summer.

The court, without comment, let stand a ruling that treaties between the United States and other nations generally ban the hunting between March 10 and Sept. 1.

Let stand a ruling that the city of Philadelphia must make a subway station renovated with federal money accessible to the handicapped.

The justices refused to hear the city's appeal of a 3rd U.S. Circuit Court of Appeals ruling requiring it to install an elevator at the Columbia Avenue station at Temple University.

Rejected a challenge to New York City's rent control law.

The court, citing the lack of "a substantial federal question," refused to hear arguments that the law "confiscates" landlords' property by limiting yearly rent increases for apartments to 7.5 percent.

Refused to hear the case of a $3 million libel award against the CBS televison affiliate in Chicago for a 1981 commentary on the Brown & Williamson Tobacco Corp. The case was brought by CBS seeking review of a ruling by the 7th U.S. Circuit Court of Appeals.

B&W, which manufactures Viceroy, Kool and other cigarette brands, brought the suit after a commentary by Walter Jacobson, a news anchor and commentator for WBBM-TV in Chicago.

Refused to interfere with a ruling that struck down a Missouri law that made it a crime to threaten to commit a crime.

The court rejected an appeal by the state of Missouri seeking review of a ruling by the state Supreme Court that struck down the law as unconstitutional.

In a case involving the KAL 007 disaster, the court agreed Monday to decide whether an airline loses its protection from liability if it uses small print to inform passengers of their rights.

The court will hear arguments next term in the case brought by relatives of passengers killed when the jetliner was shot down in 1983 seeking review of a ruling by the U.S. District Court of Appeals for the District of Columbia.

Let stand a $278 fine levied against a lawyer for filing a "frivolous" action in representing a Quaker woman who claimed a "conscientious military deduction" on her tax return.

Refused to let a St. Louis airport ban all demonstrations, soliciting and distribution of political and religious literature from its terminals.

The justices, without comment, let stand rulings that an airport terminal, like a city street and sidewalk, is a public forum where free-speech rights must be accommodated.

Let stand Monday the convictions of two New Jersey state troopers for violating the civil rights of a handcuffed suspect who was beaten to death and then trying to cover up the incident.

Without comment, the high court refused to hear the appeal by Harry Messerlian and Henry Wolkowski of a ruling by the 3rd U.S. Circuit Court of Appeals.