To enroll in Medicare solely to order or certify items or services for Medicare beneficiaries, you must complete the Medicare Enrollment Application (CMS-40B). This is also known as a durable medical equipment (DME) supplier enrollment application. You will need to provide all required documentation and information, including a valid Taxpayer Identification Number (TIN), National Provider Identifier (NPI), and business information. Once your application is processed and approved, you will be able to order and certify items or services for Medicare beneficiaries. It is important to note that you cannot bill Medicare for these items or services under your own provider number.