There is a situation where Covered California will adjust your income. It happens if you fail to submit the income verification documents. In this case, because you have not verified your stated income, Covered California drops the income to $0 and you then become Medi-Cal eligible. Once you are determined Medi-Cal eligible, ONLY your county Medi-Cal office can adjust your income upwards to make you eligible for a private plan with the subsidies.
