WASHINGTON — The federal government will protect gay and transgender people against sex discrimination in health care, the Biden administration declared Monday, reversing a Trump-era policy that narrowed rights at the intersection of changing social mores and sensitive medical decisions.

It marked the latest step by President Joe Biden to advance the rights of gay and transgender people across society, from military service, to housing, to employment opportunities.

The policy announcement by the Department of Health and Human Services affirms that federal laws forbidding sex discrimination in health care also protect gay and transgender people. The Trump administration had defined “sex” to mean gender assigned at birth, thereby excluding transgender people from the law’s umbrella of protection.

“Everyone, including LGBTQ people, should be able to access health care, free from discrimination or interference, period,” said HHS Secretary Xavier Becerra.

Both opponents and supporters of Biden’s action said it’s likely to lead to litigation.

The American Medical Association said in a statement that the Biden administration “did the right thing” by ending “a dismal chapter which a federal agency sought to remove civil rights protections.” But some conservatives warned that doctors could be forced to perform gender reassignment procedures against their professional judgment.

Becerra said HHS will now be aligned with a 6-3 Supreme Court decision last year in a workplace discrimination case, which established that federal laws against sex discrimination on the job also protect gay and transgender people.

In a tweet at the time, then-President Donald Trump called the decision “horrible & politically charged.” Undeterred by the ruling, his administration proceeded to try to narrow protections against discrimination in health care.

Monday’s action means that the HHS Office for Civil Rights will again investigate complaints of sex discrimination on the basis of sexual orientation and gender identity.