Does a person on Medicaid need to continue with a secondary health insurance like Blue Cross?

I can't get a straight answer from either agency. Naturally Blue Cross wants their monthly payments to continue -- as Medicaid wants their percentage of health costs to be at a minimum. Can someone out there give me a definative answer?
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Medicaid or Medicare? Where I live, you can't get Medicaid if you have insurance. Medicaid is based on income and ability to get medical care. With Medicare, secondary health insurance is really a necessity these days.
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