Health insurers and CMS: the agency that sets one third of the revenue

A health insurer looks like a company selling a product and is better understood as a company operating inside a rate. In the Medicare Advantage business, the government pays a per-member amount derived from a benchmark, adjusted for how sick the enrolled population is, and the insurer keeps the difference between that payment and the care it funds. The customer chooses a plan; the agency sets the money.

That structure means the decisive variable is administrative rather than commercial. Enrolment growth, plan design and network negotiation all matter, but they operate on a margin whose size was fixed by a rate notice. A year in which the rate rises and medical costs are contained is a good year almost regardless of execution, and a year in which the rate is flat and utilisation rises is a bad one almost regardless of it.

The individual marketplace works differently and is exposed to the same principle from the other side. There the government does not pay the insurer directly but subsidises the premium, which decides how many people buy at all. Change the subsidy and you change the size and the health mix of the risk pool - and the second of those matters more than the first.

The cycle exists to give plans enough certainty to bid. Insurers must submit bids for the following plan year in the first half of the year, and a bid requires knowing what the government will pay. So the agency publishes a proposal in January, takes comment, and publishes the final rates in early April - long enough before the bid deadline for plans to build products around it.

The comment period is not a formality, and that is the part outsiders consistently underrate. For plan year 2027 the January notice projected an average net payment increase of 0.09 per cent; the April announcement finalised 2.48 per cent. That difference is worth more than thirteen billion dollars in additional payments to plans, against the seven hundred million the proposal implied. A ten-week administrative process moved twelve billion dollars.

For the marketplace, the equivalent instrument is the subsidy structure, and it changed by expiry rather than by rulemaking. The enhanced premium tax credits enacted in 2021 - which extended eligibility above four times the federal poverty level and capped benchmark premiums at 8.5 per cent of income - lapsed on 31 December. Analysts estimated that the average recipient's premium more than doubled in 2026 as a result, and that millions would drop coverage.

Two publications carry the whole cycle and both are free, dated and unambiguous. The Advance Notice appears in late January with the proposed growth rate, risk-model changes and star-rating adjustments; the Rate Announcement appears in early April with the final versions of each. For plan year 2027 those landed on 26 January and 6 April 2026 respectively. A market on Medicare Advantage rates is a market on a document with a known publication date.

Read the components rather than the headline. The 2027 proposal carried a benchmark growth rate of 4.97 per cent, driven mostly by per-capita cost growth in Original Medicare, and the headline net figure is what remains after risk-model and coding adjustments are applied to that. Two years with the same headline can be very different underneath, and the components are where the change from proposal to final actually happens.

The regulatory floor on spending is separate and worth knowing. Medicare Advantage plans are subject to a medical loss ratio requirement of 85 per cent - at least that share of premium must go to medical care and quality improvement rather than to administration. In this programme, rebates for falling short are paid to the agency rather than to consumers, which makes the requirement a cap on the insurer rather than a benefit to the member.