Medical Loss Ratio Explained: The Rule That Makes Rising Premiums Profitable

Q: Medical Loss Ratio Explained: The Rule That Makes Rising Premiums Profitable

The medical loss ratio caps insurance profits at 20%. But higher premiums mean higher profits. Learn how the 80/20 rule incentivizes rising health insurance costs.

The Rule Everyone Applauded

In 2010, the Affordable Care Act introduced the medical loss ratio: insurers must spend at least 80% of your premium on actual medical care. For large group plans, the threshold is 85%. The remaining 15-20% covers administrative costs and profit combined. (Source: CMS)

Consumer groups cheered. Politicians took victory laps. Finally, a cap on insurance company greed.

There was one problem. It was a percentage. Oopsie!

The Math That Breaks Everything

A percentage cap on a growing number is no cap at all.

When the ACA passed, the average employer-sponsored family premium was $13,770. By 2025, it hit $26,993---a 96% increase. (Source: KFF Employer Health Benefits Survey, 2025)

Run the MLR math on that:

2010: $100 billion in premiums x 15% = $15 billion for admin and profit
2025: $200 billion in premiums x 15% = $30 billion for admin and profit

Same percentage. Double the money. The "cap" scaled with the very problem it was supposed to solve.

The stock market noticed. Health insurer stock prices have risen approximately 1,032% since 2010---compared to 251% for the S&P 500 as a whole. (Source: Paragon Institute)

UnitedHealth Group went from $94 billion in revenue in 2010 to $400 billion in 2024, posting $22.3 billion in profit in 2023 alone. (Source: UnitedHealth Group SEC Filing) To be clear: net profit margins have stayed in the 3-5% range. The margins didn't grow. The denominator did. That is the entire point.

Every dollar your premium rises is another dollar the MLR allows insurers to keep.

How Insurers Game the Calculation

The MLR's structural flaw is bad enough. But insurers also actively manipulate the formula.

1. Reclassifying Admin Spending as "Quality Improvement"

The MLR allows insurers to count "quality improvement activities" on the medical side of the ratio. So insurers reclassify administrative expenses---IT systems, marketing, fraud prevention---as quality improvement. CMS itself flagged this concern. Insurer non-claims payments to affiliated providers grew 40.4% between 2018 and 2022, outpacing claims growth. (Source: Health Affairs Forefront, 2025; Georgetown CHIR)

Every dollar reclassified from admin to "quality" makes the MLR look better---without a single patient receiving better care.

2. Vertical Integration: Paying Yourself

Here is where it gets truly absurd. When UnitedHealthcare pays Optum---its own subsidiary---for medical services, that spending counts toward the 80% medical side of the MLR. It looks like patient care on paper. In practice, it is an internal transfer.

A peer-reviewed 2025 Health Affairs study found UnitedHealthcare pays Optum-affiliated providers 17% more than non-Optum providers for comparable services---and 61% more in concentrated markets. Sixty percent of Optum's $253 billion in revenue came from internal transfers within UnitedHealth Group. (Source: Health Affairs / Brown University, 2025)

UnitedHealth has disputed these findings, stating that Optum's payment rates reflect the quality and scope of services its providers deliver. But the structural incentive is undeniable: every inflated dollar paid to Optum satisfies the MLR while keeping money in the family.

CVS-Aetna runs the same play through its pharmacy, PBM, and clinic subsidiaries---directing 13% of medical spending to related businesses. (Source: Brookings Institution / Healthcare Labyrinth) The evidence is less quantified than UnitedHealth-Optum, but the structural opportunity is identical.

3. The Rebate Shell Game

PBMs owned by insurers negotiate drug manufacturer rebates that reduce net drug costs. But the MLR calculation can use gross drug spending before rebates, inflating the medical cost numerator. The insurer looks like it is spending more on care. The rebate dollars flow back through the corporate structure. (Source: FREOPP)

MLR Rebates: The Consolation Prize

When insurers fail to meet the MLR threshold, they owe you a rebate. In 2024, insurers returned $958 million to roughly 6 million consumers---an average of about $156 per person. Cumulative rebates since 2012 total approximately $12.7 billion. (Source: CMS; KFF)

That sounds meaningful until you put it in context. Americans paid trillions in premiums over that same period. The rebate mechanism is a rounding error---a consolation prize that proves the rule is technically being enforced while changing almost nothing about total insurer compensation.

And the gaming strategies above mean fewer insurers miss the threshold in the first place.

What Would Actually Work

The MLR's failure is a design problem, not an enforcement problem. You cannot fix a percentage cap that rewards the thing it is supposed to constrain. Researchers across the political spectrum have proposed alternatives.

Absolute dollar caps per enrollee. Instead of allowing 15-20% of whatever premiums happen to be, cap admin and profit at a fixed dollar amount per member---say, $1,200. Premiums go up, the cap stays put. Both the Center for American Progress (left-leaning) and FREOPP (right-leaning) have endorsed versions of this approach. (Source: CAP; FREOPP)

Rate review with teeth. The ACA created a rate review process that can flag premium increases above 10% as "unreasonable"---but most states cannot block them. Giving regulators actual authority to reject excessive rate increases would address the problem directly. (Source: KFF)

Prohibit insurer-provider vertical integration. If insurers cannot own providers, they cannot game the MLR by paying their own subsidiaries inflated rates. The Center for American Progress has proposed a "Healthcare Glass-Steagall" separating insurance from care delivery. (Source: CAP)

Join the rest of the world Most western countries have some form of single-payer or government-provided healthcare. The United States spends $2,497 per capita on healthcare administration---compared to $551 in Canada. (Source: NEJM, 2020) The problem is not that Americans are sicker. It is that our system is designed to extract profit at every layer, not make people healthier.

This Was Not an Accident

The health insurance industry did not have the MLR imposed on them. They helped write the law that created it. The principal drafter of the Senate's ACA bill was Liz Fowler, who came directly from her position as Vice President at WellPoint---the nation's largest health insurer. Senator Baucus called her "the architect" of the legislation on the Senate floor. The health sector spent $544 million lobbying Congress in 2009 alone, deploying 4,525 lobbyists---eight for every member of Congress. (Source: Center for Public Integrity, 2010) Meanwhile, AHIP---the insurance industry's trade group---publicly pledged to support reform while secretly funneling $102 million to the U.S. Chamber of Commerce to fight it. They got the percentage-based formula they could live with (even though they wanted more), and the individual mandate that flooded them with millions of new customers as a bonus. Then they spent the next fifteen years proving exactly what a percentage cap on a growing number would do.

Premiums nearly doubled. Insurer stocks outperformed the market four to one. They bought their own doctors, their own pharmacies, their own data companies---and counted every inflated payment to themselves as "medical care." They reclassified their own bureaucracy as quality improvement. They turned a consumer protection into a profit engine. And every legislative attempt to curb the relentless increase of healthcare costs dies quietly in committee.

Meanwhile, 100 million Americans carry medical debt. People skip medications, delay surgeries, and declare bankruptcy---not because medicine failed them, but because a spreadsheet said their suffering was profitable. Every denied claim, every inflated premium, every dollar routed through a subsidiary shell game is a transfer of wealth from people who got sick to executives who got rich.

This is not a broken system. This is the system working exactly as they designed it. Institutionalized, legalized, percentage-guaranteed theft---and it will not stop until the formula that enables it is replaced with one that doesn't reward the people who are supposed to be on your side for making everything cost more.

Frequently Asked Questions

The medical loss ratio (MLR) is an ACA requirement enacted in 2010 (effective 2011) that health insurers spend at least 80% of individual and small group premiums, or 85% of large group premiums, on medical care and quality improvement activities. The remaining 15-20% covers administrative costs and profit combined. If insurers fail to meet the threshold, they must issue rebates to consumers.

The 80/20 rule is another name for the medical loss ratio. It means insurers must spend at least 80 cents of every premium dollar on actual medical care (for individual and small group plans). Large group plans follow an 85/15 rule. The remaining percentage covers administration, marketing, executive compensation, and profit. Importantly, the 15-20% covers admin AND profit combined—actual net profit margins for major insurers are typically 3-5%.

Yes. If your insurer spends less than 80% (or 85% for large group) of premiums on care, they must issue a rebate by September 30 of the following year. In 2024, insurers returned $958 million to about 6 million consumers—an average of roughly $156 per person. You may receive the rebate as a check, a premium credit, or a reduction in future premiums, depending on your plan type.

Insurers game the MLR in three main ways: (1) reclassifying administrative costs as quality improvement activities, which count on the medical side of the ratio; (2) using vertical integration to pay their own subsidiaries for medical services at inflated rates, which satisfies the MLR while keeping money in-house; and (3) using PBM rebate structures where gross drug spending inflates the medical cost numerator. CMS has flagged several of these practices and proposed rule changes.

Policy experts across the political spectrum have proposed replacing the percentage-based cap with absolute dollar caps on admin and profit per enrollee. This removes the incentive for insurers to benefit from rising premiums. Other proposals include giving state regulators binding authority to reject excessive rate increases, prohibiting vertical integration between insurers and providers (a Healthcare Glass-Steagall), and expanding Medicare drug price negotiation.

Average employer-sponsored family premiums rose from $13,770 in 2010 to $26,993 in 2025—a 96% increase, according to the KFF Employer Health Benefits Survey. Because the MLR is a percentage cap, this increase directly expanded the dollar amount insurers are allowed to retain for admin and profit. Insurer stock prices rose approximately 1,032% over the same period, compared to 251% for the S&P 500.