Beginning July 1, 2015, Medicaid is no longer reimbursing partial Medicare Part B coinsurance amounts. The total Medicare/Medicaid payment to the provider will not exceed the amount that the provider would have received for a Medicaid-only patient. If the Medicare payment is greater than the Medicaid fee, no additional payment will be made
Here is a link with more information
https://www.health.ny.gov/health_care/medicaid/program/update/2015/jun15_mu.pdf
Beginning April 1, 2016, Medicaid will reimburse at the rate of eighty-five percent (85%) of the Medicare Part C (Medicare Advantage or Medicare managed care) copayment or coinsurance amount.
Here is a link with more information
https://www.health.ny.gov/health_care/medicaid/program/update/2016/2016-07.htm
Here is NY state report about how Medicaid made excessive payments for Medicare Part C cost-sharing liabilities