Share of cost is a Medicaid program that lets people with income above the normal eligibility limit still qualify for coverage, as long as they first pay a set amount of their own medical expenses each month. Think of it like a monthly deductible: once your out-of-pocket medical spending hits your share of cost amount, Medicaid kicks in and covers the rest of your care for that month.
The program is sometimes called a “spend-down” because you’re essentially spending down your excess income on medical bills before the state picks up the tab. It exists in 34 states as of 2025, though the specific rules and income thresholds vary significantly from state to state.
How Your Share of Cost Is Calculated
Your share of cost amount is based on the gap between your monthly income and your state’s “maintenance need level,” which is the income threshold the state considers necessary for basic living expenses. The state subtracts that maintenance need level from your countable income, and whatever is left over becomes your monthly share of cost.
For example, if your monthly income is $1,500 and your state’s maintenance need level is $500, your share of cost would be $1,000 per month. You’d need to rack up $1,000 in medical expenses before Medicaid coverage activates for the remainder of that month. The median maintenance need level across states was $511 in 2025, up slightly from $504 in 2024, though individual states set their own figures and they range widely.
The Monthly Reset
One of the most important things to understand is that your share of cost renews every month. If you meet your share of cost in January, you start over at zero in February. And if you don’t meet it in a given month, that unmet amount doesn’t carry over. You simply don’t have Medicaid coverage that month, and the clock resets on the first of the next month.
This means coverage can be unpredictable. In months when you have a doctor’s visit, lab work, or a prescription filled, you may hit your threshold and get the rest of your care covered. In months when you’re relatively healthy and don’t generate enough medical expenses, you won’t qualify for any Medicaid-paid services at all.
What Counts Toward Your Share of Cost
The range of expenses you can apply is broader than many people realize. In California’s Medi-Cal program, for instance, all medically necessary health services count, including doctor visits, medical supplies, devices, and prescription drugs. This applies whether or not those specific services are normally covered by Medi-Cal. So even expenses for services outside Medi-Cal’s usual benefit package can help you meet your threshold.
You can also use old unpaid medical bills. If you have outstanding medical debt that you’re still legally responsible for, those bills can be applied toward your current month’s share of cost, and even carried into future months if they aren’t fully used up. To do this, you typically need to bring those old bills to your county welfare office, which handles the processing rather than the medical provider.
This is a useful strategy if you have lingering medical bills. A single large unpaid hospital bill, for example, could potentially help you meet your share of cost for several months in a row.
How Coverage Gets Activated
Meeting your share of cost isn’t automatic. You need to show proof that you’ve incurred enough medical expenses. In practice, this usually works one of two ways: either you present your medical bills to your county welfare office, or a healthcare provider bills the state directly and the system calculates whether your threshold has been met.
The process has some nuances worth knowing. If a provider reissues a bill, the state treats it as unpaid in the month it was reissued. If you’ve already paid that bill, the provider needs to mark it as “PAID” with their initials to avoid confusion. For people in long-term care facilities like nursing homes, slightly different rules apply. Nursing homes can deduct current unpaid medical bills from your share of cost, but only if those bills are submitted within two months of the service date.
Share of Cost vs. Other Out-of-Pocket Costs
Share of cost can look similar to a health insurance deductible, but there are key differences. A typical insurance deductible accumulates over an entire year. Share of cost resets monthly. A deductible also applies before any coverage begins, while share of cost specifically determines whether you qualify for Medicaid at all in a given month. Once you meet it, Medicaid generally covers your remaining care with no further cost-sharing for that month.
It’s also different from a copay, which is a fixed amount you pay at each visit regardless of your total spending. With share of cost, once you cross your monthly threshold, additional visits and services are fully covered.
Strategies to Lower or Eliminate It
If your share of cost is high enough that you rarely meet it, there are a few practical approaches. First, schedule multiple medical appointments in the same month so the expenses stack up and push you past the threshold. If you need lab work, a dental visit, and a prescription refill, grouping them together gives you a better chance of activating coverage that month.
Second, apply any old unpaid medical bills you still owe. As noted above, these can count toward your current share of cost even if the services happened months or years ago, as long as you’re still legally liable for the debt.
Third, check whether your state offers alternative Medicaid pathways with higher income limits or no share of cost. Eligibility rules have expanded in many states, and you may qualify for a different program that provides full coverage without a monthly spend-down requirement. Your county social services office can review your situation and determine if a better option exists.
Which States Offer Share of Cost
Not every state has a medically needy or share of cost program. As of 2025, 34 states offer this pathway. The remaining states don’t have a spend-down option, meaning if your income exceeds the standard Medicaid limit, you simply don’t qualify. California’s Medi-Cal program is one of the most well-known share of cost systems, but states like Nebraska and many others run their own versions with different income thresholds and procedural rules. If you’re unsure whether your state participates, your local Medicaid office or state health department website will have the details.