Same Knee Surgery, Twice the Price: Hospital Monopolies Push Up Healthcare Costs, Part One

This story by Peter Whoriskey appeared on KFF Health News on August 10, 2026. We are sharing it in two parts.

More than a million times a year, a U.S. surgeon slices open a knee, strips out worn cartilage, caps the leg bones with metal, and drops in a plastic spacer to allow the new joint to glide.

While knee replacement procedures have become standard, however, the prices charged have not.

At Catawba Valley Medical Center in Hickory, North Carolina, for example, the cost of the procedure under a Blue Cross Blue Shield health plan this year was about $16,000, according to data from Serif Health, a San Francisco startup that collects recently released data from hospitals and insurers. Little more than an hour’s drive west, however, at Mission Hospital in Asheville, the cost of the procedure under the same health plan was around $40,000, or more than double, the data showed.

Formed by the merger of the two largest hospitals in the region, Mission has little competition and more power to demand the higher price.

This comparison between these two hospitals illuminates how large hospital systems created by a wave of U.S. mergers in recent decades can dominate the competition and push up healthcare costs.

While many factors affect the price of a medical procedure, hospitals with few competitors can charge more, health economists say.

The hospital price hikes mean patients and their insurers must pay more for an episode of healthcare. But there is an important side effect, too, even for people who don’t require medical care. When insurers face higher hospital prices, they pass the costs on and raise the prices they charge for everyone’s health insurance.

Using Serif Health’s pricing data, it is possible to see how mergers like the one that created Mission Hospital influence costs. For years, it was difficult to determine how much hospital monopolies boosted charges. But since 2021, the Centers for Medicare & Medicaid Services has required hospitals to disclose prices, making it possible to gather comprehensive data such as Serif Health’s.

The connection between market power and prices exists across the country. In Melbourne, Florida, Holmes Regional Medical Center is part of a health system, Health First, that dominates surrounding Brevard County. The center has charged Cigna two times what a hospital two hours north did for a knee replacement this year, the Serif Health data shows.

Banner North Colorado Medical Center, which ranks as the leading healthcare provider in Weld County, Colorado, charged a UnitedHealthcare patient $20,000 more for the surgery in Greeley than a health system an hour’s drive south in Denver, according to Serif’s figures.

The American Hospital Association has argued that hospital mergers can improve quality and reduce healthcare costs by creating “a fiscally sustainable environment.” A Mission Hospital spokesperson said comparing hospitals’ prices was unfair or misleading because their practices and constraints vary so much.

For years, economists suspected that the run of mergers beginning in the late 1990s was a main driver of the rising costs of U.S. healthcare. From 2002 to 2020 alone, more than 1,000 hospital mergers unfolded in the United States.

But until the recent federal disclosure rule, the effect of healthcare monopolies on pricing was often overlooked or harder to detect. Hospitals do not advertise their prices, and even when they are revealed on a bill, patients scarcely notice the bottom line because they don’t pay most of it — their insurers do.

“What the data shows pretty clearly is that when hospitals have bargaining leverage, they tend to have higher prices,” said Zack Cooper, an associate professor of public health and economics at Yale University who has spent more than a decade studying hospital monopolies.

Over the last quarter century, Cooper said, hospital prices have risen faster than those for any other economic sector, and “hospital consolidation is one of the primary drivers.”

Federal and state officials have wavered over when to intervene when hospitals are proposing to merge. Last summer, President Donald Trump revoked former President Joe Biden’s 2021 directive that urged federal agencies to challenge mergers that could harm consumers, reversing course from Biden’s more aggressive enforcement of antitrust law. In a March memo, however, Federal Trade Commission Chairman Andrew Ferguson called for a task force on healthcare mergers that are leading to “higher prices” and “decreased quality” of care.

Several states have sought to curb healthcare monopolies. In 2023, Minnesota passed a law banning anticompetitive healthcare mergers and bolstering state oversight. In 2022, California passed a law requiring healthcare businesses to give the state a 90-day notice of large mergers and created an agency to investigate their effects on competition. And Oregon passed a law in 2021 enabling the state health department to block acquisitions and mergers of hospitals.

Nothing has stopped the overall trend, however, as hospitals seek to grow and gain leverage over insurers and competitors. Last year alone, hospital and health systems announced 46 mergers and acquisitions, according to Kaufman Hall, a healthcare business consulting firm. Five ranked as “mega-mergers,” meaning they were valued at more than $1 billion. One merged 28 hospitals across Connecticut and New York into a powerful interstate health system. Another linked Sanford Health and Marshfield Clinic Health System, a deal that created a 56-hospital system across the Midwest — including Iowa, Michigan, Minnesota, Wisconsin, and Wyoming — with combined revenue of about $10 billion.

Other mergers have been proposed in California, Hawai‘i, and Minnesota.

Read Part Two… tomorrow…