CMS to Enforce New Hospital Price Transparency Data—Including What Insurers Actually Pay—Starting April 1

On April 1, the federal government will stop taking hospitals largely at their word about what medical care costs.

After more than five years of uneven compliance with hospital price-transparency rules, the Centers for Medicare & Medicaid Services (CMS) is set to begin enforcing new requirements that force hospitals to show what health plans actually pay them—and to put a senior executive’s name on the line for the accuracy of those numbers.

The changes, finalized in November as part of the 2026 Medicare Hospital Outpatient Prospective Payment System and Ambulatory Surgical Center rule, technically took effect Jan. 1. But CMS delayed active enforcement of the new data elements until April, giving hospitals an extra three months to retool their systems.

The shift marks a new phase in a transparency push that began in 2021 and has been dogged by incomplete data, hard-to-use files and disputes over how many hospitals are following the law. It raises the stakes for hospitals that still fall short, with potential civil monetary penalties that can reach into the millions of dollars a year for large facilities.

What changes on April 1

Under the updated regulations at 45 CFR Part 180, hospitals must continue to post machine-readable files listing their “standard charges”—gross charges, discounted cash prices, and payer-specific negotiated rates—for all items and services. What changes on April 1 is the level of detail and evidence required, and how aggressively CMS says it will police those requirements.

For any service where a hospital’s rate with an insurer is defined as a percentage of charges or another algorithm rather than a flat dollar amount, the hospital will now have to disclose what those contracts translate into in practice. Specifically, it must calculate and publish, in dollars, the median, 10th percentile and 90th percentile of the “allowed amounts” paid over a 12- to 15-month period, along with the number of claims used to compute those figures.

CMS defines the allowed amount as the total a plan allows for a service, including both the insurer’s payment and the patient’s share. Hospitals are instructed to derive the new statistics from electronic remittance data such as the standard 835 electronic remittance advice.

In the preamble to the final rule, CMS said it was eliminating a previous “estimated allowed amount” field in favor of these historical percentiles, arguing that “estimates based on contract terms may not reflect amounts that are actually paid” and can mislead the public.

Executive attestation and new identifier requirements

The agency is also tightening governance around the files. Each hospital must now include a formal attestation that, “to the best of its knowledge and belief,” it has included all required standard charge information and that “the information encoded is true, accurate, and complete as of the date in the file.” The file must list the name of the hospital’s chief executive officer, president or another senior official designated to oversee the accuracy of the data.

In addition, hospitals will have to report all of their organizational, or Type 2, National Provider Identifier (NPI) numbers associated with hospital and hospital-unit taxonomy codes that are active as of the last update date. CMS says that requirement is intended to make it easier to link price files with other data sources, such as claims and quality metrics.

These new elements build on earlier efforts to standardize the format of hospital price files. A 2024 rule required hospitals to use a CMS-designed template and data dictionary for their machine-readable files, place a prominent “Price Transparency” link in the footer of their home pages, and host a simple text “locator” file at the root of their websites pointing to the transparency resources.

Why CMS says it is doing this

CMS officials have framed the changes as part of a broader strategy to make health care markets more competitive by arming patients and purchasers with clear pricing information.

“Hospital price transparency helps people know the cost of a hospital item or service before receiving it,” the agency says in a public fact sheet. “This information can be used by patients, employers, and others to make more informed decisions about where to receive care and how to lower health care costs.”

Advocacy groups and some employers say that vision has yet to be realized. PatientRightsAdvocate.org, a nonprofit that has repeatedly pressed the administration to toughen enforcement, reported in February that nearly two-thirds of the 2,000 hospitals it reviewed were still not fully following the rules.

In its Sixth Semi-Annual Hospital Price Transparency Compliance Report, the group said only 34.5% of surveyed hospitals were fully compliant with federal requirements, while 65.5% were not. Eighty-seven hospitals, about 4%, were described as in “total noncompliance” for failing to post any usable machine-readable file of standard charges.

“Nearly two-thirds of hospitals reviewed continue failing to fully comply with the rule, yet … CMS has only fined fourteen hospitals for noncompliance,” the group wrote in a letter to President Joe Biden released with the report. “When hospitals don’t post their prices, they can charge whatever they want.”

Hospital leaders dispute that characterization and say regulators have been actively engaged in bringing facilities into line without resorting to fines in most cases.

In a July 22, 2025, letter responding to a CMS request for information on the accuracy and completeness of hospital price data, the American Hospital Association (AHA) said that between Jan. 7, 2021, and March 31, 2025, the agency conducted more than 6,000 audits and enforcement actions across over 3,000 hospital cases.

According to the AHA’s tally, CMS found nearly 1,000 hospitals compliant at the time of review and saw nearly 2,000 more come into compliance after being contacted by the agency. The AHA said the relatively small number of civil monetary penalties—27 over that period, by its count—reflected the success of that collaborative approach.

“Because of hospitals’ efforts to comply with the hospital price transparency regulations, CMS has only issued 27 civil monetary penalties, rather than a lack of CMS’ active auditing or enforcement,” the association wrote.

Hospital groups have also raised concerns about the administrative burden of the new requirements, particularly for smaller and rural facilities that may lack sophisticated IT infrastructure. Industry presentations have warned members that mining remittance data, calculating allowed-amount percentiles and maintaining CMS-compliant templates will require substantial staff time and investment.

What penalties look like—and a new discount for faster resolution

Alongside the new data obligations, CMS is refining how it uses financial penalties. The basic penalty framework, updated in a 2022 rule, remains in place: hospitals with 30 or fewer beds face a minimum penalty of $300 per day of noncompliance, while larger hospitals are subject to $10 per bed per day, capped at $5,500 daily. Adjusted for inflation, a large hospital that ignores the rules for a full year can incur more than $2 million in fines.

The 2026 rule adds a new incentive aimed at resolving enforcement cases more quickly. If a hospital waives its right to a hearing before an administrative law judge and accepts CMS’s finding that it violated the transparency rules, the agency will reduce the civil monetary penalty by 35%. The discount is unavailable for what CMS calls “core” failures—such as not posting any machine-readable file or any consumer-friendly display of shoppable services—and can be used only once for a given set of continuing violations. A hospital that takes the reduction also waives appeal rights for subsequent penalties related to the same unresolved problem.

Even before the latest rule, CMS had been tightening its enforcement playbook. The agency now typically sends an initial warning notice giving hospitals 90 days to fix deficiencies. If they do not, CMS issues a corrective action plan request; hospitals then have 45 days to submit a plan and 90 days from the request to come into full compliance.

CMS has said it will automatically impose penalties on hospitals that fail to submit a corrective plan by the deadline or fail to fulfill its terms. For hospitals that appear to make no effort at compliance—those with no machine-readable file and no shoppable services list or estimator tool—CMS has reserved the right to skip the warning letter and immediately demand a corrective action plan.

The forthcoming enforcement of the new data fields means a larger set of potential violations will now move through that pipeline. In addition to missing or hidden files, auditors will be looking at whether hospitals properly report required percentile allowed amounts, list their Type 2 NPIs and include a compliant attestation with an identified executive.

What it may mean for patients and payers

For patients, the immediate impact may be limited. The machine-readable files, which can run into millions of rows, are not designed for individual consumers to read. Instead, CMS and outside observers expect employers, unions, researchers and technology firms to be the primary users of the enhanced data, building tools that could eventually trickle down to patient-friendly price estimates.

Employer groups have argued that more precise, standardized data on what plans actually pay hospitals will strengthen their hand in negotiations and help them steer workers to lower-cost, high-quality facilities. Insurers, too, may use the information to redesign networks and benefit structures.

At the system level, economists and policy analysts say the richer data set could inform future efforts to rein in hospital prices, from tougher antitrust scrutiny of highly concentrated markets to proposals that would cap commercial payments at a multiple of Medicare rates.

For now, though, the focus is on whether hospitals meet the new April 1 standard—and how vigorously CMS follows through.

Agency officials have stressed that the three-month grace period was meant to give hospitals time to adjust their systems, not to delay accountability. In a March 12 Medicare Learning Network newsletter sent to providers, CMS stated plainly: “Enforcement of new and updated Hospital Price Transparency (HPT) requirements … starts April 1, 2026.”

After years in which price transparency often meant a hard-to-find spreadsheet of list prices few patients ever paid, federal regulators are betting that more detailed, standardized and verifiable data—backed by the possibility of meaningful fines—will finally make those numbers matter. Whether it changes how care is priced, or simply how it is seen, will become clearer as hospitals’ new files start to appear and enforcement actions follow.