The income guidelines for an insurance plan through the Marketplace start beyond the income guidelines for Medicaid, so the short answer is no. When you go to the Marketplace website, you will be able to check to see what is available to you. If your estimated income is within Medicaid eligibility, the website will direct you to the Medicaid application process.
When the Affordable Care Act was put into effect, the parameters for Medicaid eligibility were expanded for the sole purpose of making more people eligible for Medicaid and avoiding the need to pay for health insurance.
The initial check is based on the state you live in and the number of people in your household. In short, your household includes the head of the house and all those claimed as tax dependents due to age or disability. Accurately counting the size of your household is crucial in the application process.