Managing Social Security and Medicaid Benefits When You Live in Your Vehicle

People assume Social Security and Medicaid require a permanent address because the forms ask for one and every other government office treats an address as proof you exist. The actual rules behind both programs say otherwise. I learned the Medicaid half of this the hard way, by getting it wrong myself before I understood how it works.

What Medicaid requires

When I moved from Vermont to Arizona, I did what seemed like the responsible thing and told Vermont I no longer lived there. Vermont closed my Medicaid case, which is exactly what's supposed to happen, since you can't be enrolled in two states at once.

What I didn't know was that closing one state's coverage doesn't open the door to the next state's coverage automatically. I had to apply fresh in Arizona, on Arizona's terms, and I came up short. The income and asset rules aren't identical state to state, and what qualified me in Vermont didn't qualify me in Arizona.

The lesson buried in that mess is that your legal state of residency, the one tied to your driver's license and vehicle registration, doesn't have to be the same state your Medicaid comes from. Federal regulation defines Medicaid residency as wherever you're currently living and intend to remain, and it says plainly that a fixed address isn't required to meet that definition. States aren't allowed to deny or terminate Medicaid solely because someone lacks a permanent dwelling.

Washington and Louisiana both spell this out directly in their own eligibility manuals: lacking an address doesn't change your residency status, and intent to stay is what counts.

The real complication isn't proving you live somewhere, it's deciding which state that is, and which state your Medicaid should follow. If you're choosing or changing a domicile state for your license and registration, it's worth treating your Medicaid eligibility as its own separate decision rather than assuming it'll just tag along.

Where out of state Medicaid works, and where it doesn't

Once you have Medicaid through a particular state, getting care while you're physically somewhere else gets complicated fast, though the complication isn't random. Federal regulation requires your home state's Medicaid program to pay for care you get out of state if it's a genuine medical emergency, if your health would be endangered by waiting until you got back, or if the right care simply isn't available where you currently are.

Hospitals are also required by a separate federal law to screen and stabilize anyone who shows up at an emergency room, regardless of insurance, which is part of why ERs and out of state Medicaid tend to work out even when nobody planned it in advance.

That's roughly what happened to me in February 2025, when I ended up admitted to a hospital in California while my Medicaid was based in another state. Medicare paid its share first, the way it always does for someone with both, and my out of state Medicaid picked up the rest as the secondary payer, including the deductible and coinsurance Medicare didn't cover.

I don't remember the exact dollar breakdown anymore, but the part I would have owed out of pocket came out close to nothing.

Urgent care is a different story, because urgent care clinics aren't bound by the same screening law hospital emergency rooms are, and most simply don't bother enrolling to bill out of state Medicaid at all.

I found that out at a campground in Quartzsite, Arizona, after I cut my thumb badly enough tearing down my tent that I was fairly sure it needed stitches. I called around to a few urgent cares, and every one of them turned down my out of state Medicaid before I even got in the door.

Going to an ER was the technically correct move, but I didn't want to sit through a long wait for what I could manage myself, so I wrapped it tight, changed the dressing when it bled through, and let it close on its own. It healed eventually, into a ragged scar that's still there because it never got the stitches it needed.

Telehealth has its own version of this problem

Telehealth runs into a version of the same wall, but the cause is medical licensing law rather than Medicaid itself. A doctor generally has to be licensed in whatever state you're physically sitting in at the moment of the visit, not the state where the doctor's office is, and not the state your Medicaid comes from.

In practice this means a doctor's office will ask where you are before they'll even schedule you, and they'll ask again right before connecting you to the doctor, because the answer can change the legality of the visit entirely.

If you want telehealth to work reliably, being in the same state as both your Medicaid and your doctor at the time of the appointment is the simplest way to avoid the question altogether.

Social Security, by comparison

Social Security is the easier of the two, mostly because it's a federal program that follows you everywhere instead of resetting at every state line. The agency maintains a page specifically for people experiencing homelessness, states plainly that you have the same rights to apply for benefits as anyone else, and asks you to disclose if you don't have a fixed address so staff can adjust how they handle your case. For mail, you can use a trusted contact person's address, a friend, family member, or service provider, with their permission, general delivery at a post office, or a paid mail forwarding service.

Where Social Security still trips people up is timing rather than eligibility. If the agency can't reach you, your mail comes back undeliverable, or you don't respond to a request in time, your payments can be suspended under what's officially called a whereabouts unknown status.

That status exists to protect the program from sending money to someone who can't be located, but it doesn't distinguish between someone who's disappeared and someone who's three states away from where their mail is sitting.

Setting up a my Social Security online account and switching to electronic notices takes the mail timeline out of the equation almost entirely.

What this looks like in practice

• Before choosing or changing a domicile state, check that state's Medicaid eligibility rules first. Your domicile and your Medicaid don't have to match, but assuming they automatically will is how coverage gaps happen.

• Don't close Medicaid in your old state until you've confirmed you qualify in the new one. A short overlap beats a gap every time.

• Save the ER for anything you'd genuinely call an emergency. Federal rules require your home state's Medicaid to pay for true emergency care wherever it happens, and hospitals are legally required to screen and stabilize you regardless of insurance.

• For anything short of an emergency, call ahead. Urgent cares and routine providers have no obligation to take an out of state card, and plenty won't.

• For telehealth, plan to be physically present in the same state as both your Medicaid and your provider during the appointment. The doctor's license depends on where you're sitting, not just your insurance.

• Set up a mail solution for Social Security before you need it, a trusted contact person, general delivery, or a mail forwarding service, and open a my Social Security account so notices come electronically instead of depending on paper catching up to you.

• Tell Social Security directly that you don't have a fixed address, and calendar your renewal and redetermination dates the same way you'd calendar a vehicle registration.

  
  

None of this removes the basic mismatch between how these systems were built and how some of us live. The rules make sense on their own terms: they verify who's eligible, make sure the right state pays for the right person, and keep doctors accountable to wherever they're licensed to practice.

What they weren't built around is someone who's a legitimate resident of nowhere in particular and everywhere they happen to be parked. I found most of this out by getting it wrong first, closing coverage I needed before confirming the next state would pick it up, and showing up to urgent care with a card nobody there would take.

None of that was inevitable, and it's a lot easier to plan around once you know it's coming.

Sources

Social Security Administration. (n.d.). People experiencing homelessness & service providers. https://www.ssa.gov/homelessness/

Social Security Administration. (2008). POMS SI 02301.240: Whereabouts unknown (S06). https://secure.ssa.gov/poms.nsf/lnx/0502301240

Centers for Medicare & Medicaid Services. (n.d.). Implementation guide: Medicaid state plan eligibility, state residency. U.S. Department of Health and Human Services. https://www.medicaid.gov/resources-for-states/downloads/macpro-ig-state-residency.pdf

Washington State Department of Social and Health Services. (n.d.). Residency requirements. https://www.dshs.wa.gov/esa/eligibility-z-manual-ea-z/residency-requirements

Code of Federal Regulations. (n.d.). 42 CFR § 435.403: State residence.

Code of Federal Regulations. (n.d.). 42 CFR § 431.52: Payments for services furnished out of state.

Medicaid Planning Assistance. (n.d.). How to transfer Medicaid between states. https://www.medicaidplanningassistance.org/transferring-medicaid/

MedicareResources.org. (n.d.). What is a Medicare crossover claim? https://www.medicareresources.org/glossary/crossover-claim/

U.S. Department of Health and Human Services. (n.d.). Licensing across state lines. Telehealth.HHS.gov. https://telehealth.hhs.gov/licensure/licensing-across-state-lines