Millions of Medicare Advantage enrollees face the real possibility of losing their current health plan before 2027 coverage begins. Insurers are pulling back from counties across the country, and federal data released in June 2026 shows the scale of those service-area reductions taking shape. Researchers at Johns Hopkins Bloomberg School of Public Health found that 1 in 10 Medicare Advantage enrollees faced forced disenrollment in the prior coverage year alone, and the pattern is now extending into the 2027 filing cycle.
Why insurer exits threaten coverage for seniors heading into 2027
The threat is not abstract. When a Medicare Advantage insurer drops a county from its service area, every enrollee in that county loses their plan. They must either find a new MA option or switch to traditional Medicare, often with different cost-sharing, provider networks, and prescription drug coverage. For seniors managing chronic conditions or established specialist relationships, the disruption can delay care and raise out-of-pocket costs.
Plan exits also tend to concentrate in markets where older adults have fewer alternatives. Rural counties and smaller metropolitan areas often support only a handful of Medicare Advantage offerings. If one of the dominant carriers withdraws, beneficiaries may be left choosing between a single remaining MA plan and a return to fee-for-service Medicare, which can involve separate decisions about Medigap policies and standalone Part D coverage. Even when another MA plan is available, formularies and network designs can differ enough to force patients to change physicians or switch medications.
These shifts land on top of already complex annual enrollment decisions. Seniors must evaluate premiums, deductibles, maximum out-of-pocket limits, and supplemental benefits, all while trying to confirm that their preferred doctors and hospitals are in network. A sudden county-level exit compresses that decision-making into a shorter window, often triggered by a notice letter, and raises the risk that beneficiaries will default into suboptimal coverage simply to avoid a lapse.
Insurers, for their part, point to financial and regulatory pressures. Counties with lower payment benchmarks can make it difficult to sustain broad networks or generous supplemental benefits without incurring losses. When those benchmarks fall relative to underlying medical costs, insurers may decide that trimming their geographic footprint is the only viable option. That calculation is separate from the quality star ratings or supplemental benefit flexibilities addressed in the final rule for contract year 2027, but all of these elements interact in determining where plans remain on the map.
CMS maintains an online plan directory with a report period of June 2026, last modified June 15, 2026. This dataset tracks which contracts and plans exist heading into a given coverage year. When matched against prior-year records, it reveals which insurers have exited specific geographies. The exits are not random. They tend to cluster in counties where payment benchmarks set by CMS make it harder for insurers to offer benefits profitably, a dynamic separate from the quality ratings or supplemental benefit rules in the final rule for contract year 2027.
The CMS rate announcement for 2027, reviewed by the Government Accountability Office as a major rule under report B-338301, establishes the capitation rates that drive insurer decisions about where to operate. Counties where those benchmarks fall below a viable threshold relative to fee-for-service costs are the most likely to see plan withdrawals, regardless of other regulatory changes in the final rule.
CMS data and Johns Hopkins research document the disruption
Three primary CMS datasets form the evidence base for tracking how many seniors stand to lose coverage. The plan directory identifies active contracts and plans. The monthly enrollment file provides member counts at the contract, plan, state, and county level, making it possible to total affected beneficiaries when an insurer drops a geography. The contract service area file documents where each MA contract operates at the county level, distinguishing full market exits from partial county withdrawals.
By linking these files across years, analysts can identify which contracts disappear from particular counties and how many enrollees are attached to those plans. When a contract no longer appears in a county’s service area but still shows enrollment in the prior year, those members are counted as facing a forced disenrollment. This method underpins much of the current research on Medicare Advantage market stability and offers an early warning system for policymakers watching the 2027 landscape come into focus.
Johns Hopkins Bloomberg School of Public Health published research drawing on these same CMS plan and enrollment files. That analysis found that 1 in 10 Medicare Advantage enrollees faced forced disenrollment in 2026, a finding based on JAMA research using CMS data sources. The 2027 filing cycle shows a continuation of this trend, with early CMS records indicating that service-area reductions are again concentrated in lower-benchmark counties and in markets where a small number of insurers control most of the enrollment.
For beneficiaries, the numbers translate into tangible choices in the upcoming open enrollment period. Seniors in affected counties will need to review their options carefully, confirm provider participation, and weigh whether remaining in Medicare Advantage or shifting to traditional Medicare best fits their medical and financial needs. For regulators and lawmakers, the emerging data raise questions about how payment benchmarks, risk adjustment, and oversight of plan exits can be calibrated to preserve competition without leaving older adults to absorb the shock of abrupt coverage loss year after year.
