What Is the CMS-855R? Reassignment of Medicare Benefits Explained (2026)

Quick Answers

The CMS-855R is the Medicare enrollment application that reassigns an individual provider’s right to bill Medicare and receive payment to an eligible group or organization. As of 2026, the standalone paper 855R has been folded into the CMS-855I, so reassignment is now reported on the 855I on paper, while PECOS still handles it electronically.

• What it does: It lets a group practice or organization bill Medicare and collect payment for the Part B services an individual practitioner renders.
• Paper vs. PECOS: The paper 855R was discontinued in 2023 and merged into the 855I, but a reassignment can still be established or terminated electronically in PECOS.
• Both parties enrolled: The provider and the receiving organization must each be enrolled in Medicare, or enrolling at the same time, before the reassignment can take effect.

What the CMS-855R Actually Does

Reassignment of Medicare benefits is the mechanism that lets a group practice, clinic, or health system bill Medicare and receive payment for services an individual physician or non-physician practitioner performs. Without it, only the individual could collect on their own Part B claims. With it, the provider assigns that payment right to the organization they work for, so the group’s tax ID receives the reimbursement.

The CMS-855R (officially the Medicare Enrollment Application: Reassignment of Medicare Benefits, OMB control number 0938-1179) is the form CMS built to capture that arrangement. It documents who the individual practitioner is, which organization is receiving the reassigned benefits, and the effective date the arrangement begins or ends.

A few points trip providers up more than any other. First, the 855R never enrolls anyone by itself. The individual has to be enrolled through the CMS-855I and the organization through the CMS-855B, or already active in Medicare, before a reassignment can attach to anything. Second, one reassignment covers one relationship. A physician joining three groups needs a separate reassignment for each organization and tax ID. Third, the same process terminates a reassignment when a provider leaves a group, which is the step practices most often forget and the reason old reassignments quietly linger on a provider’s record.

In our work filing Medicare enrollments across 40+ states, the reassignment step is where more otherwise clean applications stall than almost anywhere else, usually because the individual and the group were not both enrolled first, or because a prior reassignment was never terminated.

Why Reassignment of Benefits Matters

Reassignment is not a bureaucratic formality. It is the wiring that determines who actually gets paid. When a provider reassigns benefits to a group, Medicare routes payment for that provider’s covered Part B services to the group’s tax ID and billing number rather than to the individual. Get it wrong and claims either pay to the wrong entity or do not pay at all.

For a group practice, reassignment is what makes group billing possible in the first place. Every employed or contracted clinician who bills under the group’s number needs an active reassignment on file, tied to the correct location and tax ID. When one of those reassignments is missing, expired, or pointed at an old address, the payer can hold or deny the associated claims, and the group does not always find out until the revenue stops arriving.

There is also a compliance dimension. A reassignment defines the legal relationship Medicare recognizes between a provider and an organization. Billing a provider’s services under a group number without a valid reassignment on record is the kind of gap that surfaces during a revalidation or an audit, and it is far cheaper to prevent than to unwind after the fact.

Providers often come to us after a group has been billing for a new hire for weeks, only to learn the reassignment was never completed and a stack of claims is now sitting in limbo. The services were legitimate and the documentation was fine. The money was stuck purely because the reassignment paperwork had not caught up with the hire date.

Is the CMS-855R Still a Separate Form in 2026?

Not on paper. Effective September 1, 2023, CMS merged the standalone CMS-855R into the CMS-855I paper enrollment application, and after November 1, 2023 Medicare contractors began returning old standalone 855R and 855I versions. Reassignment is now reported on the 855I on paper, though PECOS still handles it electronically.

This is the single biggest point of confusion we see, and most articles ranking for CMS-855R have not caught up to it. For years, an individual practitioner reassigning benefits to a group filed a separate 855R. CMS retired that workflow. The reassignment data now lives inside Section 4F of the revised CMS-855I (the 05/23 version and later). A group accepting a new reassignment, changing one, or terminating one reports it on the 855I as well, with the authorized or delegated official signing Section 15C.

Two practical consequences follow. First, if you download an old standalone 855R PDF and mail it in, your Medicare Administrative Contractor (MAC) will return it and ask for the current 855I, which costs you weeks. Second, the term 855R has not disappeared. People still say file an 855R to mean set up a reassignment, and PECOS still treats reassignment as its own action you can add or end electronically without touching paper at all. So the concept is alive and required. Only the standalone paper form is gone.

CMS confirms the change in its Medicare Learning Network guidance (MLN9658742) and in the consolidated 855I bulletin, both of which state the 855R was merged into the 855I. If a source you are reading still describes mailing a standalone 855R as the current process, treat it as out of date.

The CMS-855 Form Family Compared

Because reassignment now rides inside the 855I, it helps to see where each CMS-855 form fits. If you are mapping out which Medicare enrollment form your situation actually calls for, our guide to the CMS-855 application family breaks down the 855I, 855B, and 855S in detail. Here is the short version.

Form	Who Uses It	Purpose
CMS-855I	Individual physicians and NPPs	Enrolls an individual in Medicare; now also carries reassignment in Section 4F
CMS-855B	Clinics, group practices, other organizational suppliers	Enrolls a group or organization to bill Medicare
CMS-855R	Merged into the 855I	Formerly the standalone reassignment form; reassignment is now reported on the 855I
CMS-855A	Institutional providers (hospitals, home health, hospice)	Enrolls institutional providers
CMS-855S	DMEPOS suppliers	Enrolls suppliers of durable medical equipment
CMS-855O	Ordering and referring physicians only	Enrolls providers who order or refer but do not bill

A word on fees, since it comes up constantly. For 2026, CMS sets the institutional application fee at $750, which applies to organizational enrollments such as the 855B, 855A, and 855S. Individual enrollment on the 855I generally carries no application fee, and a reassignment reported through it does not add one.

How Do You File a Reassignment of Benefits?

To file a reassignment in 2026, confirm both the individual and the group are enrolled in Medicare, then report the reassignment either in PECOS electronically or on Section 4F of the CMS-855I on paper. The individual signs to grant the reassignment and an authorized official of the group signs to accept it.

Follow these steps to set up a clean reassignment:

1. Confirm both enrollments. Verify the individual is active on the 855I and the group is active on the 855B before starting, since a reassignment cannot attach to an unenrolled party.
2. Gather the identifiers. Collect the individual’s NPI and PTAN plus the group’s legal name, tax ID, NPI, and Medicare identification number.
3. Choose your channel. Submit through PECOS for the fastest turnaround, or complete Section 4F of the paper CMS-855I if you file on paper.
4. Set the effective date. Enter the date the reassignment should begin, keeping in mind Medicare ties the effective date to when it receives a complete application.
5. Capture both signatures. Have the individual sign to grant the reassignment and an authorized or delegated official of the group sign to accept it.
6. Track it to approval. Follow the application with the MAC and respond fast to any development request, because unanswered requests are the top reason reassignments stall.

The most common issue we see providers run into is a reassignment that gets returned for a missing signature or a mismatched tax ID, then sits untouched because no one is watching the MAC’s response. A file that could have been fixed in a day instead ages for weeks.

Who Has to Sign the CMS-855R?

A new reassignment requires two signatures: the individual practitioner signs to grant it, and a delegated or authorized official of the receiving group signs to accept it. To terminate a reassignment, either the individual or an official of the group can sign. Both signatures are required for a new reassignment to be processed.

On the retired paper 855R, those signatures lived in Section 6A for the individual and Section 6B for the group official. On the current 855I, the same logic applies through the reassignment section and the authorized or delegated official signature in Section 15C. The principle has not changed: a reassignment is a two-party agreement, so Medicare wants both parties on record.

Missing or mismatched signatures are one of the three most common reasons enrollment applications get returned, alongside NPI data that does not match across records and incomplete practice location information. Electronic signatures in PECOS reduce the risk because the system prompts each party, but a paper filing that goes out with only one signature, or with a signature from someone who is not an authorized official, will come straight back.

One more nuance worth flagging: physician assistant employment arrangements are not reported through reassignment. Those go on the 855I directly. Using a reassignment to report a PA employment relationship is a mistake we still see, and it triggers a return.

How Long Does a Medicare Reassignment Take?

A clean Medicare reassignment filed in PECOS is typically processed in about 45 to 65 days, though roughly 40% of applications need corrections that add another 15 to 30 days. Overall provider enrollment, including credentialing, commonly runs 90 to 120 days depending on the payer and state.

The reassignment itself is usually one of the faster pieces, but it rarely travels alone. It is attached to an enrollment or a group addition, and the whole package moves at the speed of its slowest part. If the individual’s 855I is still pending, or the group’s 855B has not been approved, the reassignment waits behind them.

The effective date matters as much as the processing time. Medicare generally sets the effective date to when it received a complete application, not when you started it. A reassignment returned for corrections and resubmitted resets that clock to the corrected submission date, which can leave a gap of unbillable services. That is why catching errors before submission, rather than after a return, is worth real money.

Common CMS-855R Filing Mistakes

Across the reassignments we file, the same handful of errors account for most of the delays. Providers download and mail the old standalone 855R, which no longer exists as a current form, and the MAC returns it. A physician joins a group but the group’s 855B is still pending, so the reassignment has nothing active to attach to. A provider leaves one group for another and the old reassignment is never terminated, so claims keep routing to the former employer or trip a conflict. Signatures come from someone who is not an authorized official. Tax IDs or NPIs do not match across the individual record, the group record, and CAQH.

None of these are complicated on their own. They are just easy to miss when enrollment is a side task squeezed between patient care and payroll. That is exactly why many groups fold reassignment into a broader provider enrollment engagement and let a dedicated team manage the Medicare enrollment filings, the follow-up, and the terminations that in-house staff tend to forget.

If you are enrolling a brand-new group and reassigning several providers at once, the sequencing gets more delicate, and pairing reassignment with full credentialing support keeps the applications from tripping over each other.

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