MORx (Missouri Rx Plan): 50% of Your Part D Out-of-Pocket Costs

MORx, the Missouri Rx Plan, pays half of what you still owe out of pocket on prescriptions your Medicare drug plan covers. It is Missouri's state pharmaceutical assistance program, run by the MO HealthNet Division, and it is built for people who have both Medicare and MO HealthNet. If that is you, there is nothing to sign up for: Missouri enrolls you in MORx automatically.1

In This Guide

• Key Takeaways
• What MORx Pays For
• Who Qualifies for MORx in Missouri
• How MORx Works With Medicare Part D
• MORx and Extra Help Are Two Different Things
• Changing Your Part D Plan
• Using MORx at the Pharmacy
• If You Are Not on MO HealthNet Yet
• Frequently Asked Questions
• Learn More

What MORx Pays For

The Missouri Rx Plan pays 50% of a member's out-of-pocket costs on prescription drugs covered by that member's Medicare Part D plan.1

Missouri states the scope of those out-of-pocket costs two ways. MO HealthNet's FAQ for dual eligibles describes MORx as paying 50% of co-pays, deductibles, and costs remaining on prescription drugs after the Medicare Part D plan pays. The governing regulation, 13 CSR 70-100.010, defines out-of-pocket costs more narrowly, as the co-pays required for prescription drugs.1 Co-pays sit inside both statements. A deductible, or a balance left over after the plan pays, sits inside only the FAQ's, so a member who does not see the 50% applied to one of those should ask which reading is being used. That question goes to the MO HealthNet Division, which administers the Missouri Rx Plan.1

The arithmetic on a co-pay is the same every time. Take a covered drug that leaves a $40 co-pay after the Part D plan pays: MORx pays $20 of it and the member pays $20 at the counter.1 Both halves count toward the member's Part D true out-of-pocket total, because amounts paid under a state pharmaceutical assistance program count among a member's incurred costs.2

Two details shape what that adds up to over a year.

There is no annual maximum. Missouri's own program guidance states that MORx has no cap or maximum on what it will cover for your prescription drugs, so the 50% share holds through the whole year rather than running out in the fall.1

It also pays in 31-day pieces. MORx covers up to a 31-day supply for each prescription fill.1

Now the edges, which the state is direct about:

• The Part D premium is not covered. Missouri's regulation, 13 CSR 70-100.010, says plainly that the Missouri Rx Plan does not pay for the Medicare Part D monthly premium.1 Federal rule makes a state pharmaceutical assistance program the secondary payer, sitting on top of what a member still owes once the Part D plan has paid.3 In Missouri, that wraparound reaches cost-sharing only, never the Part D premium.
• Compound drugs are not covered by MORx.1
• MORx follows your Part D plan's formulary. If your Part D plan does not cover a drug, MORx will not cover it either.1
• Mail order is out. MORx does not work with mail-order pharmacies, so a member who fills a 90-day maintenance drug by mail is filling it outside the benefit.1

One category cuts the other way. Drugs that Medicare Part D excludes by law, meaning specific over-the-counter drugs, vitamins, minerals, and limited cough and cold products, stay covered in Missouri for members who meet the MO HealthNet eligibility requirements, though the state's own pages differ on whether the Missouri Rx Plan or MO HealthNet is the payer.1 The formulary rule above is about drugs your Part D plan turns down, not about the whole category of things Part D never covers in the first place. If a pharmacist tells you a vitamin or an over-the-counter product is not covered, check it with the MO HealthNet Division before you pay cash for it.

Who Qualifies for MORx in Missouri

Missouri describes MORx eligibility entirely in terms of MO HealthNet participation, so the Missouri Rx Plan sits on top of Missouri Medicaid rather than beside it.

Individuals enrolled in both Medicare and MO HealthNet, the dual eligibles, are deemed to have enrolled in the Missouri Rx Plan and are automatically enrolled.1 The Missouri Department of Social Services names three groups of MO HealthNet participants in that description:

• Participants receiving full MO HealthNet benefits.1
• Participants with a spend-down requirement, whether or not they meet it, though payment turns on meeting the spend-down (below).1
• Participants who receive only coverage of their Medicare Part B premium, which in Missouri is what a Medicare Savings Program pays,4 and who are named among the automatically enrolled on the same footing as full-benefit participants.1

The Spend-Down Condition

Missourians on a MO HealthNet spend-down are automatically enrolled in MORx whether or not they meet the spend-down, but payment carries a condition. A member with a spend-down must meet it at least once during the calendar year before the Missouri Rx Plan pays 50% of that member's out-of-pocket costs.1 Until the spend-down is met that first time, MORx pays no share of those costs, and the pharmacy price stays where it was.

That condition leaves a timing question behind it. A member who meets a spend-down in July will want to know whether the fills from January through June are reprocessed at that point, or whether the 50% starts from the day the spend-down is met. What the regulation and MO HealthNet's FAQ state is the once-per-calendar-year condition itself.1 The timing question is worth putting to the MO HealthNet Division rather than assuming either answer.

What Ends Your MORx Coverage

Eligibility tracks the two programs underneath it. A member is terminated from the Missouri Rx Plan if he or she no longer meets the MO HealthNet or Medicare eligibility requirements.1 Anything that ends MO HealthNet coverage therefore ends the MORx wraparound with it, so keeping the MO HealthNet case open is what keeps MORx paying.

How MORx Works With Medicare Part D

Order of payment is set by federal rule, not by Missouri. Your Part D plan pays first. Federal regulation at 42 CFR 423.464(b) states that "a Part D plan is always the primary payer relative to a State Pharmaceutical Assistance Program."3 The pharmacy runs your Part D claim, the plan applies its price and its copay, and only then does MORx take half of what you still owe. That sequence is what "wraparound" means, and it is why MORx cannot help with a drug your plan rejected outright: there is no adjudicated balance for it to sit on top of.

MORx is the program the federal government recognizes as Missouri's state pharmaceutical assistance program. It appears on the list the Centers for Medicare & Medicaid Services (CMS) compiles of state pharmaceutical assistance programs excluded from Medicaid Best Price, a list stamped as last updated in August 2023.1 Federal rule at 42 CFR 423.464(e)(1) sets the criteria a state program must meet to hold that label.3 Two consequences of holding it reach members directly: the Part D special enrollment period described below,5 and the counting of the MORx share toward the Part D out-of-pocket cap.2

MO HealthNet enrollment is what puts a Missourian into MORx, but the two are not the same program: the federal definition of a state pharmaceutical assistance program expressly excludes state Medicaid programs, section 1115 demonstration programs, and any other program funded from federal grants, awards, contracts, entitlement programs, or other federal sources,3 and it is the Missouri Rx Plan, not MO HealthNet, that CMS carries on its list.1

That recognition carries a real benefit for members. What a state pharmaceutical assistance program pays on your behalf counts toward your Part D true out-of-pocket total, the running tally that decides when you hit the annual out-of-pocket cap. Under the federal definition of incurred costs at 42 CFR 423.100, amounts paid under a state pharmaceutical assistance program count among your incurred costs.2 The Missouri Rx Plan's 50% share does count toward that true out-of-pocket total, so it moves you toward the cap at the same speed as money out of your own pocket.1,2

MORx and Extra Help Are Two Different Things

Extra Help, the federal Part D Low-Income Subsidy, is a separate program from MORx, and the two do different jobs. People with full-benefit Medicaid coverage, people whose state pays their Part B premium through a Medicare Savings Program, and people on Supplemental Security Income receive Extra Help automatically, with no separate application.6

MORx and Extra Help split the premium differently. MORx does not pay your Part D premium.1 Extra Help is the part that handles premiums: a beneficiary with the full subsidy who is enrolled in a plan at or below the benchmark for their region pays $0 in Part D premium, while someone who picks a more expensive plan owes the difference between that plan's premium and the benchmark.7 The full subsidy also eliminates the annual Part D deductible outright.7

So the practical stack for a Missouri dual eligible looks like this: Extra Help brings the Part D premium and deductible down, your Part D plan pays the claim, and MORx takes half of the copay that is left. A premium still owed under that stack is the difference between the chosen plan and the regional benchmark,7 not a gap in MORx, which does not pay Part D premiums at all.1

Changing Your Part D Plan

Membership in a state pharmaceutical assistance program comes with a Medicare Part D special enrollment period. Under 42 CFR 423.38(c)(17), a member of a qualified state pharmaceutical assistance program "is eligible to make one enrollment election per year."5 If your MORx eligibility ends, that state pharmaceutical assistance program enrollment window stays open for an additional two calendar months after the month eligibility is lost or the month you are notified, whichever comes later.5

MORx members have a second and more generous route, though, precisely because they are dual eligible. The Contract Year 2025 Medicare Advantage and Part D final rule replaced the old quarterly special enrollment period for dually eligible and low-income-subsidy individuals with a once-per-month special enrollment period, codified at 42 CFR 423.38(c)(4), that lets them elect a standalone Part D prescription drug plan in any month.5 A separate monthly special enrollment period at 42 CFR 423.38(c)(35) lets full-benefit dual eligibles move into an aligned dual eligible special needs plan.5

Neither route costs a member the wraparound. MORx works with all approved Medicare Part D plans, including Medicare Advantage Drug Plans, so the benefit follows a member who enrolls in a Medicare Advantage drug plan rather than a standalone Part D plan.1

For a Missourian on both Medicare and MO HealthNet, the monthly window is the wider of the two. Which plan the window is used on matters to the wraparound: MORx pays only on drugs the member's Part D plan covers, so a drug the plan leaves off its formulary leaves MORx with no balance to pay half of.1

Using MORx at the Pharmacy

MORx members do not receive a membership card. The MORx member ID is the 11-digit Medicare Beneficiary Identifier printed on your Medicare card, and that is the number the pharmacy runs the claim against.1

Fill at a pharmacy that is not mail order and that is contracted with your Part D plan, and MORx wraps around the claim there.1 If a pharmacist has no record of the wraparound, ask them to check the claim against your Medicare Beneficiary Identifier before you pay the full copay.

A claim that does not resolve at the counter has a free place to go in Missouri. MO SHIP, the nonprofit certified by the federal and state government as Missouri's official State Health Insurance Assistance Program, gives free, unbiased Medicare counseling statewide, sells nothing, and charges nothing. Call 1-800-390-3330 or visit missouriship.org.8

If You Are Not on MO HealthNet Yet

Every group Missouri names as enrolled in MORx is a MO HealthNet participant.1 Membership follows from holding both Medicare and MO HealthNet rather than from a separate MORx sign-up,1 so the door in is a MO HealthNet or Medicare Savings Program application. Those are separate applications, handled by the Missouri Department of Social Services through MO HealthNet, and each carries its own income and asset test. Missouri runs its Medicare Savings Programs in three tiers, all using a 2026 resource limit of $9,950 for an individual and $14,910 for a couple. The monthly figures below are the gross income limits MO HealthNet publishes; a federal $20 monthly income disregard puts the effective cutoffs slightly above them.4

• QMB, income under 100% of the federal poverty level, or $1,330 a month for an individual and $1,804 for a couple: pays the Medicare Part B premium, in some cases Part A, and co-payments and deductibles for Medicare services.4
• SLMB1, income under 120% of the federal poverty level, or $1,596 individual and $2,164 couple: pays the Part B premium only.4
• SLMB2, also called QI-1, income under 135% of the federal poverty level, or $1,796 individual and $2,435 couple: pays the Part B premium only.4

Three places to start:

1. Check the income and asset tests in our guide to Missouri Medicaid eligibility.
2. If your income is above the full Medicaid line, look at Missouri's Medicare Savings Programs. Even the version that pays nothing but your Part B premium puts you in the group Missouri names as automatically enrolled in MORx.1
3. Walk through the application itself with how to apply for MO HealthNet.

If Your Income or Resources Are Over Every Missouri Line

A Missourian above 135% of the federal poverty level, or over the $9,950 and $14,910 resource limits,4 is outside MORx, because every group Missouri names as enrolled is a MO HealthNet participant.1 Extra Help, the federal Part D Low-Income Subsidy, reaches further up the income scale than Missouri's Medicare Savings Program tiers do: Social Security's 2026 Part D coverage table applies the subsidy to beneficiaries with income below 150% of the federal poverty level.7 The full subsidy takes the Part D premium to $0 in a plan at or below the regional benchmark7 and eliminates the annual Part D deductible outright.7 Our guide to Medicare Extra Help covers who qualifies and how the application works.

Learn More

Find personalized help sorting out MORx, MO HealthNet, and your Medicare Part D coverage in Missouri at brevy.com.

The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.