Mary janes are shoes with a strap, or multiple straps, across the top of the shoe, usually right over the top of the foot. Mary janes typically have rounded closed toes.
About SADMERC:
SADMERC or Statistical Analysis of Durable Medical Equipment Regional Carrier, a department of The Centers for Medicare & Medicaid Services, conducts data analysis and reviews of products to determine the healthcare code to be applied on therapeutic footwear and related healthcare accessories.