How to Analyze a Health Insurance Company: 7 Steps

To analyze a health insurance company, separate its business by funding type, then focus on the medical loss ratio and the medical cost trend that drives it, check whether reserves have been adequate, split revenue growth into membership, price and risk score, find where the group actually books its profit, and map the regulatory calendar that sets its rates. Insurers keep a small slice of a large flow, so a one- or two-point move in medical costs matters more than almost anything management says about strategy.

The 2025 reset showed how fast that happens. In July 2025 Centene withdrew its guidance after preliminary data showed a ~$1.8 billion shortfall in expected exchange risk-adjustment revenue, and its shares fell about 40% the next day. Two months earlier UnitedHealth had suspended its guidance as Medicare Advantage costs ran ahead of what it had priced. Neither shock came from a failed product. Both came from numbers buried in the medical cost line and the payment formula.

This guide is educational. It explains how analysts, lenders and operators read an insurer; it is not a recommendation on any security.

Step 1: What business is the insurer actually in?

Start by splitting the company into its funding arrangements. Each has different rules, capital needs and political risk.

Most covered workers, roughly 60–67% (KFF), are in self-funded plans, where the carrier is mainly a network and claims administrator. Comparing insurers on total "members" without separating the two is the most common mistake outsiders make.

The book's industry study gives a stylized employer with 2,200 members to show why. Fully insured, the premium works out to about $603 per member per month, and the insurer's expected profit is about $0.48 million a year. As an ASO client, the insurer earns about $0.21 million a year with no claims risk and little capital. A large carrier's commercial book is mostly this second kind of business, which is why its earnings are steadier than its government lines.

Humana, with roughly 80–85% of revenue from the federal government, and Molina Healthcare, centered on Medicaid, carry very different risks from a carrier whose commercial book is mostly self-funded.

Step 2: How do you read the medical loss ratio?

The medical loss ratio, or medical care ratio in company reporting, is the share of premium spent on care. The Affordable Care Act requires at least 80% for individual and small-group plans and 85% for large-group plans; Medicare Advantage and Part D face an 85% floor. Insurers that fall short must rebate the difference.

Three features shape how to read it:

• It caps the upside but not the downside. A good year is partly rebated; a bad year is absorbed.
• It rewards a bigger denominator. If profit is capped as a share of premium, profit dollars grow mainly by growing premium.
• It pushed groups to integrate. Payments to an owned clinic or pharmacy count as medical cost, while the affiliate's margin sits outside the cap.

Small moves are large. A 3% underwriting margin on a $600 monthly premium is $18 per member, and a one-point miss on medical cost trend erases a third of it. UnitedHealth Group's medical care ratio rose from a historical ~82–83% to about 85% in 2024 and about 89% in 2025; each point on roughly $340 billion of premium is worth more than $3 billion of pre-tax profit. Oscar Health's ratio rose to 87.4% in 2025 from 81.7% in 2024, and it swung from its first full-year profit to a loss of about $443 million.

Step 3: Is medical cost trend running ahead of pricing?

Medical cost trend, the combined growth in prices, utilization and mix, is the master variable. A commercial rate filed in spring for the following January rests on claims from the year before, projected forward with an assumed trend. If trend accelerates after rates are set, margins compress for one to two years until repricing catches up. Insurers then overcorrect, competitors cut prices for share, and the cycle repeats. Historically it ran six to eight years peak to peak.

The industry study models this with a two-year lag: when true trend jumps from 6% to 9% for two years, a stylized carrier's MLR rises from 88.4% to 93.5% and its margin goes from +3.5% to −1.5%.

What drove trend in 2023–26 is worth knowing because it recurs: deferred care returning, older Medicare members using more outpatient services, behavioral health, specialty drugs and GLP-1s for obesity. PwC projected group medical trend of about 8.5% for 2026 (reported). Signals that show a turn before the income statement does include:

• prior-authorization request volumes;
• pharmacy claims, which arrive almost in real time;
• outpatient and surgical volumes reported by hospital companies;
• management commentary on "elevated utilization" in specific categories.

Step 4: Have reserves been adequate?

Claims arrive weeks or months after care, so insurers book an estimate of claims incurred but not reported (IBNR), using completion factors from past patterns. When utilization rises suddenly, early completion factors understate the true cost, and the insurer discovers it a quarter or two later through prior-period development. That is why insurer shocks tend to arrive in sequence: a soft warning, then a larger guidance cut.

Two metrics help. Prior-period reserve development shows whether last year's estimates proved too high (favorable) or too low (unfavorable); repeated unfavorable development is a warning. Days claims payable, the reserve balance divided by daily medical cost, should be read over time; a falling figure can mean faster payment or under-reserving. Chapter 7 of the book explains why these lead earnings rather than follow them.

Step 5: Where is revenue growth coming from?

Split revenue growth into three parts: more members, higher rates, and higher risk scores. In government business, risk scores can raise revenue with no change in membership or price, so ask what share came from in-home health assessments, chart reviews and coding.

That matters because coding-driven revenue is exposed to policy. CMS's V28 risk model, phased in over 2024–2026, removed about 2,000 diagnosis codes it judged discretionary, and MedPAC estimated in March 2025 that Medicare Advantage risk scores were about 16% higher than for comparable traditional-Medicare beneficiaries (a later report used a lower figure, reported ~12.5%). Our explainer on how Medicare Advantage plans make money shows, with a stylized plan, how each 0.01 of risk score moves revenue.

Treat fast growth with suspicion. In insurance, growth is a liability before it is an asset: new members bring unknown risk, low initial risk scores and capital requirements. The insurtechs that grew fastest in 2020–22, including Bright Health, which exited insurance almost entirely in 2023, had the worst outcomes.

For exchange business, read the state risk-adjustment results each summer. Exchange plans that attract healthier-than-average members pay their competitors, which is exactly what surprised Centene in 2025.

Step 6: Where does the group book its profit?

The large diversified groups earn a growing share of profit outside the insurance balance sheet.

Optum grew from about a third of UnitedHealth's operating earnings in 2011 to roughly half or more by the early 2020s (reported). To see this, read segment reporting and intercompany eliminations: revenue an owned PBM or clinic earns from its own group's insurer looks like medical cost from the insurer's side. Critics argue this moves margin from regulated to unregulated entities; the companies say integration lowers total cost. Either way, the insurance segment's margin understates what the group earns from each member. Our explainer on how PBMs make money covers the largest of these affiliates, and Elevance Health is a useful comparison as a group that brought its PBM in-house in 2019–20.

Network price is the other moat. The biggest differences between carriers are the rates they pay hospitals and doctors in each local market, which is why local scale often matters more than national scale.

Step 7: What is on the policy calendar?

Government-paid business makes the rule calendar part of the income statement. The dates that move health insurers are predictable:

The 2027 Medicare Advantage rate notice shows the stakes. CMS proposed a near-flat change in January 2026, and insurer shares fell sharply, then finalized +2.48% in April (reported). On the Medicaid side, the July 2025 budget law added work requirements and more frequent eligibility checks, which the book expects to leave managed-care plans with fewer, sicker members. The industry study on Medicare, Medicaid and government payers tracks these rules.

How does the Care Equation apply to insurers?

The Care Equation asks four questions of any healthcare business: does the care work, is there a payer with a renewing budget, can the company reach that payer affordably, and is the proof strong enough to survive contracting and regulation? For an insurer, the second factor runs in both directions: it is paid by employers and governments and it is the payer for everyone else. Its value depends on how well it prices that position. The fourth factor shows up as political license: utilization management, coding and denials that clinicians and regulators accept as reasonable. The book's verdict on UnitedHealth applies widely: in healthcare, scale is a defense until it becomes the target.

The takeaway

Analyzing a health insurer means looking past membership and revenue to the few numbers that decide profit: the funding mix, the medical loss ratio, the cost trend behind it, reserve development, the sources of revenue growth and the segments where the group really earns. Then put dates on the rules that can change all of them. Most insurer surprises were visible in those places a quarter or two early. For the full treatment, read Chapter 7, Insurers and Managed Care, and for how insurers fit the whole system, see how the healthcare industry makes money.