What Medicaid is
Medicaid is the country’s largest health coverage program: free or low-cost insurance for people with limited income, funded jointly by the federal government and the states and run day to day by each state. That joint structure is the single most important fact about it. Federal law sets the floor, states build on it differently, and the program you can actually enroll in depends on where you live.
Coverage through Medicaid is comprehensive. States must cover core services including hospital care, physician visits, laboratory work, and nursing facility care, and every state adds optional benefits on top. For most enrollees, premiums are zero and cost-sharing is minimal, within limits federal law sets.
One more structural fact worth knowing: there is no open enrollment season. You can apply for Medicaid any day of the year, and coverage can apply retroactively in many states for bills from the months just before you applied.
Who qualifies, and why the answer is “it depends”
Eligibility runs on two axes: category and income.
Categories include children, pregnant women, parents and caretakers, adults under 65, seniors, and people with disabilities, each with its own income rules. Children’s eligibility reaches well up the income scale in most states, especially when the Children’s Health Insurance Program (CHIP) is counted alongside.
For adults under 65, the dividing line is whether your state adopted the ACA’s Medicaid expansion. Expansion states cover adults with household incomes up to 138% of the federal poverty level under the rules described in federal eligibility policy. Non-expansion states cover far fewer adults, sometimes only parents with very low incomes, which creates a coverage gap for adults who earn too much for Medicaid but too little for marketplace subsidies.
Because the thresholds move with state choices, household size, and annual poverty-level updates, the practical advice is simple: do not self-disqualify based on a number you read somewhere. Apply. HealthCare.gov screens every application against your state’s Medicaid and CHIP rules automatically, and your state Medicaid agency takes applications directly.
The rules are changing: work requirements
The 2025 federal budget reconciliation law made the largest change to adult Medicaid eligibility since the ACA. It requires states to condition coverage for most adults in the expansion group on “community engagement”: generally 80 hours per month of work, qualifying education, or service, or meeting an income threshold, with implementation required by January 1, 2027, and states permitted to start earlier. CMS has issued rulemaking to implement the requirement, and KFF maintains a tracker of how states are rolling it out.
The law includes exemptions, including for pregnant and postpartum women, parents and caretakers of younger children, people who are medically frail, and certain others. The details of documentation, timing, and exemptions will be set state by state.
What this means practically, without editorializing: if you are an adult covered through Medicaid expansion, expect new paperwork between now and 2027, watch every notice your state agency sends, and keep your contact information current with the agency so a missed letter does not become a lost coverage month. If you are unsure how the requirement applies to you, ask your state Medicaid agency directly. That is the only answer that counts.
How to apply, and what to do if you are denied
One renewal note that now matters every year: Medicaid eligibility is redetermined periodically, and states disenroll people who miss paperwork even when they still qualify. Respond to every renewal notice, keep your address and phone number current with the agency, and if you lose coverage for a procedural reason, ask about reinstatement. Many states allow a window to submit the missing documents.
Two doors, both official and free. Apply at HealthCare.gov, which forwards Medicaid-eligible applications to your state. Or apply through your state Medicaid agency’s own site or office, which can be faster and handles categories the marketplace screen does not.
Have income documentation, household information, and immigration or citizenship documents ready. If your application is denied, you have appeal rights, and a denial also opens a special enrollment period to buy subsidized marketplace coverage. Our ACA explainer covers that path.
Medicaid itself costs little, but tight budgets feel every other fixed bill more sharply, and car insurance is usually the most padded one. Carriers raise renewal prices on customers who never comparison shop, and undoing it takes about twenty minutes. Compare auto insurance rates this week and put the difference back in the grocery budget.