Which form must providers complete to renew participation in Medicare?

The CMS 855 form is specifically designed for providers to enroll and renew their participation in Medicare. This form is used to collect the necessary information regarding a provider's practice, including their credentials, service locations, and other relevant details. By completing the CMS 855, providers can ensure that their participation in Medicare remains active and compliant with the program's requirements.

Other forms mentioned, such as the CMS 1500, are primarily used for billing purposes rather than for enrollment or renewal. The CMS 1500 form is a standard claim form used by healthcare providers to bill Medicare and other insurers for services rendered to patients. The CMS 500 is not a recognized Medicare form associated with provider enrollment or renewal, and while "Medicare Application Form" might sound relevant, it lacks the specificity and recognition that the CMS 855 has in federal regulations regarding provider enrollment. Hence, the CMS 855 is indeed the correct choice for renewing participation in Medicare.