Five factors driving (or inhibiting) CSR takeup in ACA private plan markets

I want to lay out some notes here for a regression analysis of what drives takeup (or the lack of takeup) of Cost Sharing Reduction (CSR) subsidies among buyers of private health plans on ACA exchanges. CSR reduces out-of-pocket costs for buyers with incomes under 251% of the Federal Poverty Level (FPL).  The benefit is quite strong up to 200% FPL, but almost negligible in the 201-250% FPL range.

CSR is best understood not as some obscure secondary benefit but as the ACA's best defense against underinsurance -- that is, against leaving plan holders on the hook for more medical expenses than they can afford. Thanks mainly to CSR, about 60% of buyers on ACA exchanges buy insurance with an actuarial value of 80% or higher - - coverage comparable to or more comprehensive than that offered by most employers. Without CSR, only 10% of exchange customers would access that AV level. CSR provides insurance with AV 87% or 94% to about half of ACA exchange customers.

CSR is a leaky vessel, however, Only about three quarters of those who are eligible access the benefit, including probably a bit over 80% of those eligible for "strong" CSR (AV 87% or 94%). Silver plan premiums can be a hard swallow for low income buyers. In 2015, somewhere between 15% and 20% of buyers under 201% FPL probably opted for cheaper bronze plans with their sky-high deductibles (usually over $5,000 per individual).

CSR takeup among all eligible buyers varies quite a bit from state to state, most commonly between 70% and 80%, more broadly between about 68% and 85% -- discounting a few states that have layered their own benefit structures on the national ACA template (e.g., Vermont and Massachusetts).  In various posts, I've spotlighted factors that have an impact (or may have an impact) on CSR takeup levels, though none form a basis for consistent predictions. Below, I've listed those factors in what I would guess to be descending order of likely impact.

Saved from the Medicaid Gap

Prompted in part by my observation last week that at least a third of Florida's 1.4 million private plan enrollees on healthcare.gov would have been Medicaid-eligible if the state had accepted the ACA Medicaid expansion, Richard Mayhew poses a question (or rather, elaborates on one posed in a comment on my post):

Liberal technocrats have been assuming that the states which refuse to expand are giving up massive amounts of money and thus economic growth by refusing to expand Medicaid will eventually expand.  However, are we accounting for the additional cash flow coming in as premium and cost sharing subsidies for people making between 100% and 138% Federal Poverty Line.

Leaving aside the financial question, we can make some reasonable estimates as to what percentage of those who would have been eligible for Medicaid had their states not refused the expansion are now in subsidized private health plans purchased on healthcare.gov. (All but one of the states that refused the expansion use the federal exchange).

On one side of the equation, we have Kaiser's state-by-state estimates of how many people fall in the Medicaid gap -- that is, have household incomes under 100% of the Federal Poverty Level (FPL) but are shut out of Medicaid in their state. On the other side is the number of subsidized private plan buyers in non-expansion states who have incomes in the 100-138% FPL range -- those who would have been eligible for Medicaid if their states had accepted the expansion.

Alabama's Obamacare buyers ride a Silverado

Spotlight here is on Alabama in my continuing close look at how many low income ACA private plan buyers accessed Cost Sharing Reduction (CSR) subsidies by buying silver plans. (Yesterday, HHS released detailed county-level data about buyers of private plans on healthcare.gov, the federal exchange, enabling a close look at state stats.)

CSR is available to buyers with household incomes below 251% of the Federal Poverty Level (FPL), and strongest for buyers under 201% FPL. It is available only with silver plans, the second-cheapest of four metal levels available on ACA exchanges -- a fact that's less than obvious to the average shopper, Buyers under 201% FPL are leaving a really strong benefit on the table if they don't buy silver plans (see the note at bottom for more detail). I consider the percentage of buyers under 201% FPL who select silver an important measure of how well the exchange is functioning in a given state. (Those in the 201-250% FPL range are likelier to have good cause to forego the relatively negligible CSR provided at that level.)