A deductible in Medicaid works much like a deductible for private insurance. A person is responsible for a certain amount of medical bills before insurance pays. The difference is that a Medicaid deductible is not a set dollar amount (such as $100 or $250). It is based upon the person’s income. If income is more than a limit set by law there must be a deductible. The deductible is the amount of income over the income limit. A deductible can be for 1, 2 or 3 months before the month of application or for a period of 6 months beginning with the month you apply.