Common inquiries -- Part B Reduce the time it takes to answer your Medicare question by viewing common Part B inquiries received by customer service. February 11, 2026
Commonly used provider enrollment terms and their definitions View these commonly used enrollment terms. June 4, 2025
Completing the Medicare CMS-20134 enrollment application View instructions on completing the CMS-20134 enrollment application. February 18, 2026
Completing the Medicare CMS-460 enrollment application CMS released a new version of Form CMS-460 (version 12/28). The former version (11/22) will no longer be accepted by the MACs... Latest updates: Enrollment March 6, 2026
Completing the Medicare CMS-588 enrollment application View these instructions for the CMS-588 application. October 30, 2025
Completing the Medicare CMS-855A enrollment application for institutional providers View these guidelines for completing the CMS-855A enrollment application for Part A institutional providers. April 8, 2026
Completing the Medicare CMS-855B enrollment application View instructions for completing the CMS-855B application. February 18, 2026
Completing the Medicare CMS-855O enrollment application View these instructions for the CMS-855O form. February 18, 2026
Completing the Medicare enrollment CMS-855I application View these instructions for the CMS-855I form. Latest updates: Enrollment June 4, 2025
Completing the revalidation process At some point, all Medicare providers/suppliers will be asked to revalidate Medicare enrollment information. Have you been sent... March 9, 2026
