Missouri Medicaid Spend Down: How the Monthly Deductible Works

Missouri's Medicaid spend-down trips up more families than almost any other part of the application process. Your parent qualifies clinically, their assets are below the limit — but their Social Security income is $300 over the threshold. That $300 becomes a monthly obligation that must be met before MO HealthNet activates coverage.

Miss it one month and your parent has no Medicaid coverage that month. Choose the wrong payment method and coverage starts mid-month instead of day one.

How the Spend-Down Amount Is Calculated

The Family Support Division (FSD) subtracts the applicable medically needy income limit from your parent's gross countable income. The difference is the monthly spend-down.

Example: A parent receiving $1,431/month in Social Security, applying under the MHABD program (limit: $1,131/month):

$1,431 - $1,131 = $300/month spend-down

Before this calculation, FSD applies several deductions that reduce the spend-down amount:

• $20 personal income exemption
• First $65 of earned income plus half of any remaining earned income
• All SSI payments
• Monthly health insurance premiums

After deductions, the actual spend-down is often lower than the raw calculation suggests.

Option A: Direct Pay-In

Pay the spend-down amount directly to the MO HealthNet Division. This is the simpler option because it provides full Medicaid coverage for the entire calendar month — from day one through day 30 or 31.

Three ways to pay:

• Online via credit card or electronic check at mymohealthportal.com
• By mail — send a check or money order to the Premium Collections Unit (P.O. Box 808001, Kansas City)
• Automatic bank draft — submit the Spend Down Pay-In Automatic Withdrawal Authorization form and the payment pulls automatically on the 10th of each month

The automatic draft is the safest option because it prevents missed months. One forgotten payment means one month without coverage — and if care was delivered that month, you pay out of pocket.

Option B: Incurred Medical Bills

Submit proof of medical expenses that your parent is personally responsible for and that aren't covered by Medicare or private insurance. Acceptable expenses include doctor bills, prescriptions, dental care, and authorized home care costs.

Submit documentation through:

• Online upload at mydssupload.mo.gov
• Email to [email protected]
• Fax to 855-600-3754
• Mail to the Spend Down Unit in Houston, Missouri

Use Form IM-29SDP to submit bills.

The critical difference: under the incurred bills option, coverage doesn't activate retroactively to the first of the month. It starts on the specific day your submitted bills reach the spend-down threshold. If your parent's $300 spend-down is met on the 15th, they have no Medicaid coverage from the 1st through the 14th.

Carryover Rules

If your parent has a large medical bill that exceeds one month's spend-down, Missouri allows carryover. Bills from the current month or any of the three previous months can be applied to the current spend-down and/or any of the next three months.

The tradeoff: carrying a bill forward from a previous month means your parent forfeits coverage for that original month. You can't double-count a bill for two different months.

Which Option to Choose

For most families, the direct pay-in is the right choice — full-month coverage with no risk of gaps. The incurred bills option only makes sense if your parent has consistent, predictable medical expenses that reliably exceed the spend-down amount early in each month.

If your parent has a $50/month spend-down, the convenience of automatic pay-in outweighs any savings from tracking and submitting bills. If the spend-down is $800/month and your parent has ongoing prescription costs that hit that threshold by the 3rd of each month, the incurred bills route may work — but the pay-in is still more predictable.

The Missouri Home Care Guide includes a spend-down calculator worksheet and a month-by-month tracking template for managing ongoing obligations.

See more Missouri guides →