Medicare Fee-for-Service, or Original Medicare, is coverage managed by the federal government. Generally, there is a cost for each service. Enteral nutrition is covered under the Prosthetic Device Benefit of Medicare Part B (Source: Enteral Nutrition Supplies & Equipment). Other sources: How Original Medicare Works and Part B Costs. Although there may be policies or Local Coverage Determinations for various therapies, there is usually coverage criteria that must be met. Therefore, coverage is not guaranteed and is based on medical necessity.