Health insurance companies make money in more ways than most customers realize. Premiums are only the visible layer. The industry also collects per-member payments from Medicare and Medicaid, fixed administrative fees from employers who self-fund their own health plans, pharmacy and rebate revenue through owned pharmacy benefit managers, investment returns on billions of dollars in reserves, and smaller recoveries through subrogation and ACA risk adjustment. The mix depends on the insurer: some bear medical risk and profit when claims come in under premiums, while others earn guaranteed fees administering plans where the employer absorbs the risk.
Premium Margins Under the 80/20 Cap
When an insurer sells a plan and takes on the medical risk, it prices the premium using actuarial projections for the covered population. In the ACA individual and small-group markets, the only factors that can vary premiums are age, tobacco use, family size, and geographic area.1Centers for Medicare & Medicaid Services. Overview – Final Rule for Health Insurance Market Reforms Health status, medical history, and gender are off limits. Tobacco users can be charged up to 1.5 times the standard rate.
Profit on premiums is capped. The medical loss ratio rule requires insurers in the individual and small-group markets to spend at least 80% of premium dollars on medical care and quality improvement, and 85% for large-group plans.2HealthCare.gov. Rate Review and the 80/20 Rule Everything else — administration, marketing, and profit — has to fit in the remaining 15% to 20%. Miss the threshold, and the insurer owes rebates to policyholders. In 2024, those rebates came to roughly $1.64 billion nationwide.3Centers for Medicare & Medicaid Services. 2024 MLR Rebates by State
Big rate increases also get scrutinized. Any proposed increase of 15% or more has to go through federal review before taking effect, with the insurer publicly justifying it.4eCFR. 45 CFR 154.200 – Rate Increases Subject to Review Many states layer on their own review and can block or trim increases they view as excessive. An insurer can’t simply raise prices to boost margin; the margin is structurally thin and watched.
Government Payments: Medicare Advantage and Medicaid
For insurers that run Medicare Advantage or Medicaid managed care plans, the government is the customer. Instead of individual premiums, these insurers collect per-member, per-month capitation payments.
Medicare Advantage payments start from a county-level benchmark derived from traditional Medicare costs, then get adjusted by the insurer’s bid and a risk-adjustment score tied to each enrollee’s age, diagnoses, and demographics.5U.S. Department of Health and Human Services. Medicare Advantage Overview – A Primer on Enrollment and Spending Plans that bid below the benchmark get a rebate of 50% to 75% of the difference, which must fund extra benefits or lower cost-sharing. Quality ratings add another layer: plans at four stars or higher get a 5-point benchmark boost, doubled to 10 points in certain counties.6Medicare Payment Advisory Commission. The Medicare Advantage Program – Status Report Those quality bonuses totaled at least $13 billion in 2025, and roughly 64% of MA enrollees are now in plans that qualify.
Because higher-acuity enrollees generate higher payments, risk adjustment has become a major driver of MA revenue, and insurers put heavy resources into clinical documentation and diagnostic coding. CMS is phasing in revisions to the risk adjustment model to address coding intensity differences between Medicare Advantage and traditional Medicare.
Medicaid managed care works on a similar capitation model. States pay contracted insurers rates that must be “actuarially sound,” meaning they’re projected to cover the expected medical and administrative costs over the contract period.7eCFR. 42 CFR 438.4 – Actuarial Soundness CMS reviews and approves those rates.8Centers for Medicare & Medicaid Services. 2025-2026 Medicaid Managed Care Rate Development Guide Insurers profit when actual claims come in under the capitated rate and absorb the loss when they don’t.
Administrative Fees From Self-Funded Employer Plans
This revenue stream is the one most people miss, and it’s enormous. About 67% of workers with employer-sponsored coverage are in self-funded plans, where the employer pays the actual medical claims and the insurer only administers the plan. The insurer collects a fee regardless of what the plan spends on care. No underwriting risk, no MLR constraint on that revenue, just steady service income.
These administrative services only (ASO) contracts pay per-employee-per-month fees for claims processing, network access, utilization review, pharmacy benefit management, and care coordination. The insurer typically arranges stop-loss coverage for the employer against catastrophic claims and earns additional revenue on that placement. For large employers, modest per-member fees across thousands of workers add up to substantial, predictable annual revenue.
ASO business is a major reason the biggest insurers can post steady earnings even in years when medical costs spike. The risk sits with the employer. Fee income per member is lower than full-risk premium revenue, but it comes with far less volatility, which is why insurers compete so hard for large employer accounts.
Pharmacy Benefit Managers and Vertical Integration
The largest health insurers now own pharmacy benefit managers, and the PBM side has become a significant profit center on its own. UnitedHealth Group owns Optum Rx. Cigna’s parent owns Express Scripts. CVS Health operates both Aetna and CVS Caremark. These PBM subsidiaries negotiate drug prices with manufacturers, process pharmacy claims, manage formularies, and run mail-order and specialty pharmacies.
PBMs make money several ways. They negotiate rebates from drug manufacturers in exchange for preferred formulary placement and keep a portion of those rebates. They collect per-prescription dispensing fees from the plans they serve. In some contracts they capture “spread pricing,” charging the plan more than they reimburse the pharmacy. When the PBM also owns specialty pharmacies, it captures additional margin by routing scripts to its own locations.
The scale is striking. For CVS Health in 2024, $53 billion in revenue flowed between its pharmacy and PBM segments in intercompany transactions. For several of the largest insurers, pharmacy operations now generate more revenue than the insurance underwriting itself. The integration also gives these companies leverage over drug pricing that feeds back into lower claims costs on the insurance side.
Investment Income on Reserves
Insurers hold large reserves so they can pay claims through cost spikes and down cycles. Those reserves don’t sit in cash. They’re invested, and the returns are a meaningful secondary income stream.
State rules keep the investing conservative. Under the NAIC Investments of Insurers Model Act, accident and health insurers must keep 100% of their loss, unearned premium, and policy reserves in relatively safe assets: cash, high- and medium-grade bonds, and exchange-traded equities within set limits.9National Association of Insurance Commissioners. Investments of Insurers Model Act Equity exposure is capped at the greater of 25% of admitted assets or 100% of policyholder surplus. Risk-based capital requirements layer on top, and regulators can intervene if an insurer’s capital drops below trigger levels.10National Association of Insurance Commissioners. Risk-Based Capital
Yields on government and investment-grade corporate bonds don’t look like hedge-fund returns, but applied to billions in reserves, even a modest yield generates real income. In a higher-rate environment, that income grows and can help cushion years when claims run hotter than expected.
Protecting the Margin: Provider Contracts, Subrogation, and Risk Adjustment
The other half of making money is spending less on claims. For risk-bearing insurers, every dollar held back from claims is a dollar that stays in margin, within the MLR limits.
Provider contracts are the main lever. Insurers negotiate reimbursement using fee-for-service rates, capitation (a flat monthly amount per member that shifts risk to the provider), value-based arrangements tied to quality metrics, and shared-savings deals that split any underspend against a cost target. Contracts also carry utilization controls: prior authorization requirements, clinical guidelines, and claims audits. Providers who don’t comply risk denied claims or reduced payments.
Subrogation is a smaller but steady source of recovery. When your insurer pays for treatment after someone else injures you — say, a negligent driver — the plan has a contractual right to recover those payments out of any third-party settlement. ERISA-governed employer plans tend to have especially strong reimbursement rights because federal law preempts state limits. Medicare’s recovery rights are statutory under the Medicare Secondary Payer Act, which allows the government to pursue double damages against entities that fail to reimburse.11Office of the Law Revision Counsel. 42 USC 1395y – Exclusions From Coverage and Medicare as Secondary Payer Across millions of claims involving auto accidents, workplace injuries, and other liability situations, the recovered amounts reduce total claims expense.
ACA risk adjustment moves money between insurers in the individual and small-group markets. The program takes payments from plans with healthier-than-average enrollees and transfers them to plans with sicker-than-average enrollees, on a budget-neutral basis.12Centers for Medicare & Medicaid Services. HHS Notice of Benefit and Payment Parameters for 2026 Final Rule For an insurer that attracts a sicker population, those transfers can be substantial revenue. For an insurer with a healthier book, they’re an expense. How well a plan documents diagnoses and submits data directly affects what it receives, which is another reason insurers invest heavily in clinical coding.
Added together, the picture is a business with capped margins on its most visible product and a long list of other ways to earn: government capitation, employer administrative fees, pharmacy operations, investment returns, and recoveries at the edges. The insurers that do best are the ones that pull from most of those streams at once.