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(MRG) UPDATED: JUNE 2011 43.1 CATEGORICAL FACTORS MEDICAID BUY-IN PROGRAM FOR WORKING PEOPLE WITH DISABILITIES Interpretation: The Medicaid Buy-In program for Working People with Disabilities (MBI-WPD) consists of two groups of A/Rs, the Basic Coverage Group and the Medical Improvement Group. For eligibility in either group, work activity must be documented.