Medicare Enrollment Applications
Every CMS form, explained. Instructions, risk flags, and timelines — for individual providers, organizations, DMEPOS, and more.
Application guides
CMS-10114: Medicare Advantage Provider Enrollment
How CMS-10114 and Medicare Advantage (MCO) provider enrollment works — what's required, how it differs from Original Medicare enrollment
CMS-20134: ABA Therapy Medicare Enrollment (New 2026)
The CMS-20134 is the Medicare enrollment form for ABA therapy providers — BCBAs and BCaBAs enrolling following the 2026 ABA Medicare coverage expansion..
CMS-2728: ESRD Medical Evidence Report
What the CMS-2728 is, who completes it, when it's required for ESRD Medicare eligibility, and the provider's role in the ESRD enrollment process.
CMS-460: Medicare Participating Physician Agreement
What the CMS-460 participating provider agreement means, who should sign it, the implications for balance billing, and how to file it with your MAC.
CMS-588: Electronic Funds Transfer Authorization
How to file the CMS-588 EFT authorization for direct Medicare payment deposit, when to refile, and what happens if you skip it or your banking information.
CMS-855A: Institutional Provider Enrollment
Complete guide to the CMS-855A for hospitals, SNFs, home health agencies, hospices, and other institutional providers seeking Medicare enrollment and.
CMS-855B: Organization & Group Practice Enrollment
Complete guide to the CMS-855B — how group practices and organizations enroll in Medicare. Who needs it, step-by-step instructions, risk flags, and timelines.
CMS-855I: Individual Provider Enrollment
Complete guide to the CMS-855I Medicare enrollment application — who needs it, step-by-step instructions, risk flags, common errors, and processing timelines.
PECOS vs. Paper CMS-855I: Which to Use
Should you file your Medicare enrollment in PECOS online or use the paper CMS-855I? A direct comparison of speed, tracking, requirements
CMS-855O: Ordering & Referring Provider Enrollment
The CMS-855O enrolls providers who order or refer Medicare services but don't bill. Who needs it, when it's required, step-by-step instructions
CMS-855R: Reassignment of Medicare Benefits
How the CMS-855R works — what reassignment of Medicare benefits means, who files it, the step-by-step process, and what happens when a provider leaves a group.
CMS-855S: DMEPOS Supplier Enrollment
Complete guide to the CMS-855S for DMEPOS suppliers — who needs it, surety bond and accreditation requirements, step-by-step instructions, and risk flags.
Medicare Opt-Out: Affidavit Process for Providers
How Medicare opt-out works for providers — who can opt out, the affidavit process, private contract requirements, and the consequences of opting out.
Medicare Provider Revalidation: Complete Guide
Everything providers need to know about Medicare revalidation — deadlines, the PECOS process, what triggers deactivation, and how to reactivate after a lapse.
Tell Mae your provider type and situation — she'll identify the exact form and walk you through it.