More than 15 million Americans, a record number, have signed up for the Affordable Care Act, also known as Obamacare, so far this year, according to the HHS.

A report by The Wall Street Journal said the two are in talks for the blockbuster deal, which would create one of the biggest integrated health care firms.

More than 75,000 Kaiser Permanente workers across the country are demanding increased pay against what they are calling “unfair labor practices” and “unsafe staffing levels.”

More than 75,000 workers in eight states are picketing Kaiser Permanente forcing the healthcare provider to limit procedures for patients. ABC News’ Lionel Moise reports on the workers’ new threat.

ABC News’ Linsey Davis spoke to Kaiser union executive director Caroline Lucas about the current state of negotiations as more than 75,000 health care workers go on strike.

ABC News’ Jaclyn Lee is live on the picket lines where thousands of health care workers are striking over staffing levels and wages.

Tens of thousands of Kaiser Permanente staff launched a strike Wednesday, with a coalition of unions alleging the health care system is engaging in unfair labor practices.

These are the people who say the new Medicare drug price negotiations will save them thousands of dollars every year.

Heat is the leading weather-related killer in the U.S., according to the EPA.

The Bronx rapper wants price transparency in hospitals.

The anniversary comes as speculation continues if the president will run again in 2024.

ABC News' "Start Here" podcast spoke with ABC News' Senior Washington Reporter Devin Dwyer about a Texas federal judge's decision to rule against an Obamacare provision.

ABC News Deputy Political Director Averi Harper discusses what to expect ahead of remarks from President Joe Biden and former President Barack Obama on the 12th anniversary of the Affordable Care Act.

“As a result, 200,000 uninsured people are expected to gain coverage."

In a 7-2 ruling, the court struck down a lower court ruling and said the plaintiffs, Texas and 17 other GOP-led states, did not have standing to sue.

The Supreme Court on Thursday, in a long-anticipated decision, upheld the Affordable Care Act in a case challenging the individual mandate in Obamacare.

The ruling came at a 7-2 decision to keep Obamacare with 20 million Americans are covered by this law.

In a 7-2 ruling, the Supreme Court rejected a challenge to the ACA.

President Joe Biden and Democratic lawmakers praised the Supreme Court decision Thursday to uphold the Affordable Care Act in a case challenging its individual mandate.

The court also ruled that Philadelphia wrongly limited ties with a Catholic foster care agency over the group's refusal to work with gay couples.

This the third time the ACA has been challenged.

Jen Psaki announces the executive orders President Joe Biden signed Thursday on health care, abortion and other White House updates.

Chief Justice John Roberts and Justice Brett Kavanaugh signaled Tuesday that they’re inclined to uphold the majority of the Affordable Care Act.

Chief Justice John Roberts and Justice Brett Kavanaugh signaled that they’re inclined to uphold the majority vote in support of the Affordable Care Act, but cut the law’s individual insurance mandate.

President Donald Trump and 18 Republican-led states on Tuesday will ask the U.S. Supreme Court to eliminate the Affordable Care Act.

The justices will hear arguments from the Trump administration asking to invalidate the entire Affordable Care Act. ABC's Kenneth Moton reports.

ABC News’ Devin Dwyer reports on arguments before the Supreme Court this week on the legality of the Affordable Care Act, and speaks to Americans who may be impacted if the law is dismantled.

Missourians mobilized by the thousands to get Medicaid expansion on the ballot this year, a move that will impact 230,000 low-income residents in the "coverage gap."

The court ruled 7-2 in a case involving the Little Sisters of the Poor.

Will insurance still cover birth control?

House Speaker Nancy Pelosi called efforts to rip away the ACA during a pandemic, “unfathomable cruelty.”

The Trump administration is asking the Supreme Court to completely strike down Obamacare.

The White House promises cash payments to cover the cost of unpaid medical bills by designating $100 billion to reimburse hospitals to treat uninsured.

The Supreme Court announced it will decide the fate of the Affordable Care Act in its next term, just after the 2020 election.

The vast majority of single-payer health care plans in a new study would save the country money on health care costs.

A federal appeals court ruled the Affordable Care Act's individual mandate unconstitutional.

The decision, by a two-to-one vote on the Fifth Circuit U.S. Court of Appeals, means prolonged uncertainty for the nation’s health care system and the millions of Americans who rely on the law.

A divided federal appeals court on Wednesday threw a lifeline to the ACA, asking a lower court judge to reconsider his decision invalidating the entire law.

The latest case has largely flown under consumers’ radar.

The Trump administration announced a policy that would require hospitals to disclose negotiated rates with insurance companies.

A more generous plan with a deductible can be an attractive recruitment tool.

Among the new measures are those that authorize importing prescription drugs.

Eighteen states are fighting against Obamacare, potentially affecting millions of Americans.

A federal appeals court on Tuesday will consider the fate of the Affordable Care Act, setting the stage for a major decision that could affect health care of millions.

Backed by the Trump administration, a group of 18 Republican-led states are heading to court to invalidate Obamacare, putting millions of Americans at risk.

A federal appeals court on Tuesday will consider the fate of the Affordable Care Act, setting the stage for a major decision that could affect health care of millions.

As part of "This Week's" Critical Care series, ABC's Steve Osunsami traveled to Tennessee to report on the impact hospital closures have had on rural communities.

The administration wants to ease certain regulations affecting this group.

ABC News Correspondent David Wright examined Medicare for all in the first installment of "Critical Care" on "This Week" Sunday.

Senate Republicans "anxious" to hear about President Trump's new health care plan.