Consumers, employers, and just about everyone else interested in health care prices will soon get an unprecedented look at what insurers pay for care, perhaps helping answer a question that has long dogged those who buy insurance: Are we getting the best deal we can?

As of July 1, health insurers and self-insured employers must post on websites just about every price they’ve negotiated with providers for health care services, item by item. About the only thing excluded are the prices paid for prescription drugs, except those administered in hospitals or doctors’ offices.

The federally required data release could affect future prices or even how employers contract for health care. Many will see for the first time how well their insurers are doing compared with others. The requirements stem from the Affordable Care Act and a 2019 executive order by then-President Donald Trump.

And according to Kaiser Health News, the new rules are far broader than those that went into effect last year requiring hospitals to post their negotiated rates for the public to see. Now insurers must post the amounts paid for “every physician in network, every hospital, every surgery center, every nursing facility,” said Jeffrey Leibach, a partner at the consulting firm Guidehouse.

“When you start doing the math, you’re talking trillions of records,” he said. The fines the federal government could impose for noncompliance are also heftier than the penalties that hospitals face.

Federal officials learned from the hospital experience and gave insurers more direction on what was expected, said Leibach. Insurers or self-insured employers could be fined as much as $100 a day for each violation, for each affected enrollee if they fail to provide the data.

Entrepreneurs are expected to quickly translate the information into more user-friendly formats so it can be incorporated into new or existing services that estimate costs for patients. And starting Jan. 1, the rules require insurers to provide online tools that will help people get upfront cost estimates for about 500 so-called “shoppable” services, meaning medical care they can schedule ahead of time.

Everyone will know everyone else’s business: for example, how much insurers Aetna and Humana pay the same surgery center for a knee replacement.

“These plans are supposed to be acting on behalf of employers in negotiating good rates, and the little insight we have on that shows it has not happened,” said Elizabeth Mitchell, president and CEO of the Purchaser Business Group on Health, an affiliation of employers who offer job-based health benefits to workers. “I do believe the dynamics are going to change.”

“Maybe at best this will reduce the wide variance of prices out there,” said Zack Cooper, director of health policy at the Yale University Institution for Social and Policy Studies. “But it won’t be unleashing a consumer revolution.”

Still, the biggest value of the July data release may well be to shed light on how successful insurers have been at negotiating prices. It comes on the heels of research that has shown tremendous variation in what is paid for health care. A recent study by the Rand Corp., for example, shows that employers that offer job-based insurance plans paid, on average, 224% more than Medicare for the same services.

Tens of thousands of employers who buy insurance coverage for their workers will get this more-complete pricing picture – and may not like what they see.

“What we’re learning from the hospital data is that insurers are really bad at negotiating,” said Gerard Anderson, a professor in the department of health policy at the Johns Hopkins Bloomberg School of Public Health, citing research that found that negotiated rates for hospital care can be higher than what the facilities accept from patients who are not using insurance and are paying cash.

That could add to the frustration that Mitchell and others say employers have with the current health insurance system. More might try to contract with providers directly, only using insurance companies for claims processing.

Other employers may bring their insurers back to the bargaining table.

“For the first time, an employer will be able to go to an insurance company and say, ‘You have not negotiated a good-enough deal, and we know that because we can see the same provider has negotiated a better deal with another company,’” said James Gelfand, president of the ERISA Industry Committee, a trade group of self-insured employers.