Wisconsin's BadgerCare Quirk: No Coverage Gap Despite Not Expanding Medicaid

Wisconsin occupies a unique position in ACA Medicaid history. It is simultaneously classified as a non-expansion state (it did not adopt ACA's full Medicaid expansion to 138% FPL and does not receive the enhanced 90% federal matching funds) and yet has no coverage gap — the defining characteristic of non-expansion states. This apparent paradox is explained by BadgerCare Plus, Wisconsin's § 1115 demonstration waiver program that has been providing Medicaid-funded coverage to low-income Wisconsin adults since 1999.

BadgerCare was originally created in 1999 under Governor Thompson as a health care safety net for low-income families transitioning from welfare to work — predating the ACA entirely. When the ACA was enacted in 2010, Wisconsin chose not to accept the ACA expansion framework but instead extended BadgerCare to cover virtually all non-elderly adults below 100% FPL using its existing § 1115 waiver authority. The waiver was approved by CMS and has been renewed in successive administrations. Under Wis. Stat. § 49.471, BadgerCare Plus governs coverage for parents, caretaker relatives, childless adults, and pregnant women, with the 100% FPL ceiling as the enrollment threshold.

The structural consequence is that Wisconsin has no gap. Below 100% FPL: BadgerCare (Medicaid) covers you. Above 100% FPL: the ACA marketplace PTC covers you (just as in expansion states, where PTC begins at 100% FPL). The 100-138% FPL range — the zone where expansion states route people to Medicaid but non-expansion states leave a gap — sends Wisconsin residents to the marketplace with PTC eligibility instead. As the KFF analysis notes: "There is no gap in coverage that is typical in other states not implementing the Medicaid expansion because individuals with incomes above 100% are eligible for tax credits to purchase coverage in the Marketplaces."

For Wisconsin residents, the practical impact depends on income. Adults below 100% FPL enroll in BadgerCare through DHS Wisconsin — not the marketplace. There are no premiums for most BadgerCare enrollees below the poverty line. Adults at 100-138% FPL may enroll in a marketplace plan with APTC, which is potentially more generous (in terms of premium reduction) than what they would receive under formal Medicaid expansion because the PTC subsidy structure is designed for marketplace plans, not Medicaid. In formal expansion states, 100-138% FPL adults go to Medicaid (free/near-free), but Wisconsin's 100-138% FPL adults go to the marketplace with PTC — a different coverage vehicle, usually with a premium but also potentially with more provider choice.

The acacliff.com calculator special-cases Wisconsin in its Medicaid expansion status logic. When a Wisconsin household has MAGI between 100% and 138% FPL, the engine does not flag a coverage gap or eligibility confusion — it correctly identifies the household as PTC-eligible on the marketplace, consistent with the BadgerCare waiver structure. This is the same treatment as expansion states for that income band, even though Wisconsin's formal expansion status is "partial-via-waiver."

Because Wisconsin does not receive the full 90% federal matching funds that formal expansion states get for the 100-138% FPL Medicaid population, Wisconsin effectively "leaves money on the table" — the federal government pays less to cover Wisconsin's low-income adults than it would under formal expansion. This has been a persistent political debate in Wisconsin. Expansion advocates argue the forgone federal funds cost Wisconsin hundreds of millions annually. The state's position has been that full expansion would increase state Medicaid obligations beyond the enhanced match savings, though most analyses dispute this calculation.

BadgerCare Plus was created in 1999 under a § 1115 waiver — more than a decade before the ACA was enacted. When the ACA passed in 2010, Wisconsin's approach was to use its existing BadgerCare structure rather than adopt the ACA expansion framework. This makes Wisconsin an outlier: its Medicaid coverage for adults pre-dates the ACA, operates under different statutory authority (§ 1115 rather than § 2001), and reaches fewer people (100% FPL rather than 138% FPL) while the federal government pays a lower matching rate.

The 100-138% FPL zone in Wisconsin is handled by the marketplace with PTC and CSR, not Medicaid. A Wisconsin resident at 120% FPL ($18,072/year for a single person) pays a net marketplace premium determined by the applicable-percentage table under Rev. Proc. 2025-25. At 120% FPL, that required contribution is approximately 2.0-3.0% of MAGI per the table, meaning the PTC covers the vast majority of the benchmark Silver premium. With CSR, that Silver plan carries very low cost-sharing. For healthy residents, this can be better value than Medicaid.

The acacliff.com engine stores Wisconsin's expansion status as "partial-via-waiver" in the state data package (`packages/data/src/aca/states/wi.json`) and the cliff-analysis logic treats this status equivalently to "expanded" for purposes of coverage-gap detection. The engine does not warn of a coverage gap for Wisconsin households at any income level above 0% FPL — reflecting the real-world availability of BadgerCare below 100% FPL and PTC above it.

For residents who move to Wisconsin from a coverage-gap state (say, Texas), the transition is immediately beneficial: below 100% FPL they qualify for BadgerCare, above 100% FPL they qualify for PTC. The move to a new state is itself a qualifying life event under 45 C.F.R. § 155.420, triggering a 60-day marketplace SEP to enroll in Wisconsin coverage.