Yes! You can use AI to fill out CMS-855R, Medicare Enrollment Application: Reassignment of Medicare Benefits
The CMS-855R is a Centers for Medicare & Medicaid Services (CMS) form that allows individual healthcare practitioners to formally reassign their right to bill the Medicare program and receive Medicare Part B payments to an eligible organization, clinic, group practice, or other health care entity. It is also used to terminate a previously established reassignment of benefits. Both the individual practitioner and the receiving organization must be currently enrolled in Medicare for the reassignment to take effect, and a separate CMS-855R must be submitted for each organization involved. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
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Form specifications
| Form name: | CMS-855R, Medicare Enrollment Application: Reassignment of Medicare Benefits |
| Number of pages: | 1 |
| Language: | English |
| Categories: | CAR forms, benefit forms, CMS forms, enrollment forms, L.A. Care forms, enrollment application forms, Medicare forms |
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How to Fill Out CMS-855R Online for Free in 2026
Are you looking to fill out a CMS-855R form online quickly and accurately? Instafill.ai offers the #1 AI-powered PDF filling software of 2026, allowing you to complete your CMS-855R form in just 37 seconds or less.
Follow these steps to fill out your CMS-855R form online using Instafill.ai:
- 1 Navigate to Instafill.ai and upload the CMS-855R PDF or select it from the available form library to begin filling it out online.
- 2 In Section 1 (Basic Information), select the reason for submitting the application—whether you are establishing a new reassignment or terminating an existing one—and enter the applicable effective date.
- 3 Complete Section 2 (Organization/Group Receiving the Reassigned Benefits) by entering the organization's legal business name as reported to the IRS, Tax Identification Number (TIN), Medicare Identification Number (PTAN), and National Provider Identifier (NPI).
- 4 Fill out Section 3 (Individual Practitioner Who Is Reassigning Benefits) with the practitioner's full name, Social Security Number (SSN), Medicare Identification Number (PTAN), and NPI.
- 5 Complete Section 4 (Primary Practice Location) with the practice location name, address, and any applicable PTAN or NPI if different from those listed in Section 2.
- 6 Provide contact person details in Section 5, including name, address, phone number, fax, email, and their relationship or affiliation to the individual or organization.
- 7 Review and complete Section 6 (Certification Statements and Signatures) by having the individual practitioner sign Section 6A and the delegated or authorized official of the organization sign Section 6B with original signatures in blue ink, then submit the completed application to your designated Medicare Administrative Contractor (MAC).
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Frequently Asked Questions About Form CMS-855R
The CMS-855R is a Medicare Enrollment Application used to reassign your right to bill the Medicare program and receive Medicare payments to an eligible organization or group. It is also used to terminate an existing reassignment of Medicare benefits.
Individual practitioners (physicians and non-physician practitioners, except physician assistants for employment arrangements) who want to reassign their Medicare billing rights to an organization, group practice, clinic, or another individual must complete this form. It is also used when terminating an existing reassignment.
Yes, both the individual practitioner and the eligible organization/group must be currently enrolled in Medicare, or concurrently enrolling (via CMS-855B for the organization and CMS-855I for the individual), before the reassignment can take effect.
No, physician assistants should not use the CMS-855R to report employment arrangements. Employment arrangements for physician assistants must be reported using the CMS-855I application instead.
Yes, a separate CMS-855R must be submitted for each organization or group where a reassignment is being established or terminated. You cannot combine multiple reassignments on a single form.
When establishing a new reassignment, Section 6A must be signed by the individual practitioner, and Section 6B must be signed by a delegated or authorized official of the organization/group. If the reassignment is to an individual, that person must sign Section 6B.
When terminating a current reassignment, either the organization/group or the individual practitioner may submit the application with the appropriate sections completed and signed — either Section 6A or Section 6B.
You will need the organization/group's legal business name (as reported to the IRS), Tax Identification Number (TIN), Medicare Identification Number (PTAN), and NPI; the individual practitioner's name, Social Security Number (SSN), PTAN, and NPI; the primary practice location details; and contact person information.
Yes, all signatures must be original and signed in blue ink. Applications with signatures that are not original or not dated will not be processed. Stamped, faxed, or copied signatures are not accepted.
Send the completed application with original signatures to your designated Medicare Administrative Contractor (MAC) — the same MAC that processed your initial enrollment application. To find the mailing address for your MAC, visit www.cms.gov/MedicareProviderSupEnroll. Do not mail the application to the CMS address listed in the Privacy Act Statement, as this will significantly delay processing.
Yes, physicians and non-physician practitioners (other than physician assistants) can manage their Medicare benefit reassignments through the Internet-based Provider Enrollment, Chain and Ownership System (PECOS) at https://pecos.cms.hhs.gov, or by submitting the paper CMS-855R application.
No, an individual does not need to reassign their benefits to a corporation, limited liability company, professional association, or similar entity when he or she is the sole owner. Refer to the CMS-855I Application for Physicians and Non-Physician Practitioners for more information.
Yes, AI-powered services like Instafill.ai can help you accurately auto-fill the CMS-855R form fields, saving time and reducing errors. If you have a flat, non-fillable PDF version of the form, Instafill.ai can also convert it into an interactive fillable form so you can complete it digitally.
To fill out the CMS-855R online, visit Instafill.ai and upload your CMS-855R PDF. The AI will guide you through each section, auto-filling fields based on the information you provide, and help ensure all required fields are completed correctly before you print and submit the form with original signatures.
The form is estimated to take approximately 15 minutes to complete. After submission, your designated MAC may request additional documentation to support the application, and you are generally required to provide it within 30 days of the request. You should keep a copy of your completed application for your own records.
Compliance CMS-855R
Validation Checks by Instafill.ai
1
Application Reason Selection is Required
The form requires that exactly one reason for submission be selected from the available options: establishing a new reassignment, individual practitioner terminating a reassignment, or organization/group terminating a reassignment. This field (AppRsn) must not be left blank, as the reason determines which sections of the form must be completed and which signatures are required. If no reason is selected, the MAC cannot determine the intent of the submission and will be unable to process the application.
2
Effective Date Format and Validity
Each effective date field (Effective_Date_mmddyyyy[0], [1], and [2]) must be in the exact mm/dd/yyyy format and represent a valid calendar date. The date must not be in the past beyond a reasonable processing window, and only the effective date corresponding to the selected application reason should be populated. An improperly formatted or logically invalid date (e.g., 13/45/2023) will cause the application to be rejected or returned for correction.
3
Organization/Group Legal Business Name Matches IRS Records
The Organization/Group Legal Business Name (LegalNm) must be entered exactly as it appears on the organization's IRS records and must match the name reported on the organization's CMS-855B enrollment application. Abbreviated names, trade names, or 'doing business as' names are not acceptable in this field. A mismatch between the name on this form and IRS or PECOS records will result in the application being rejected or flagged for additional review.
4
Tax Identification Number (TIN/EIN) Format Validation
The Tax Identification Number (EIN field) for the organization/group must be a valid 9-digit Employer Identification Number in the format XX-XXXXXXX. The field must not be left blank, must contain only numeric characters, and must not be a Social Security Number. An invalid or missing TIN will prevent the MAC from verifying the organization's identity and will result in the application being returned unprocessed.
5
National Provider Identifier (NPI) Format Validation for Organization and Individual
Both the organization/group NPI (GNPI) and the individual practitioner NPI (INPI) must be valid 10-digit numeric identifiers conforming to the NPI standard. Neither field should contain letters, special characters, or fewer or more than 10 digits. An invalid NPI will prevent the MAC from cross-referencing the applicant's enrollment record in PECOS, causing the application to be rejected.
6
Individual Practitioner Social Security Number (SSN) Format Validation
The Social Security Number (SSN) for the individual practitioner must be entered in the standard 9-digit format (XXX-XX-XXXX) and must not contain invalid sequences such as all zeros in any segment (e.g., 000-XX-XXXX or XXX-00-XXXX). The SSN is a required field used to verify the practitioner's identity against Medicare enrollment records. A missing, incorrectly formatted, or invalid SSN will result in the application being returned or delayed.
7
Medicare Identification Number (PTAN) or 'Pending' Entry Validation
The Medicare Identification Number (PTAN) fields for both the organization/group (GPTAN) and the individual practitioner (IPTAN) must either contain a valid PTAN or the word 'pending' if the initial enrollment application is being submitted concurrently. Leaving these fields blank without a valid reason is not acceptable. If neither a PTAN nor 'pending' is entered, the MAC cannot confirm active or concurrent enrollment, which is a prerequisite for processing the reassignment.
8
Required Sections Completed Based on Application Reason
The sections completed must align with the selected application reason: a new reassignment requires all sections to be completed; an individual practitioner terminating a reassignment requires Sections 1, 2, 3, 5, and 6A; and an organization/group terminating a reassignment requires Sections 1, 2, 3, 5, and 6B. Any mismatch between the selected reason and the sections completed will render the application incomplete. The MAC will return incomplete applications, causing processing delays.
9
Primary Practice Location Address Completeness and State Code Validity
The primary practice location fields (PRAC_Add1, PRAC_City, PRAC_State, PRAC_Zip) are all required and must be fully populated with a valid street address, city, two-letter U.S. state abbreviation, and ZIP code. The ZIP code must be numeric and either 5 or 9 digits (ZIP+4 format). An incomplete or invalid practice location address prevents the MAC from verifying that the location is enrolled or enrolling in Medicare, which is a requirement for the reassignment to take effect.
10
ZIP Code Format Validation for All Address Fields
All ZIP code fields on the form, including the practice location ZIP (PRAC_Zip) and contact person ZIP (CNTC_Zip), must conform to either the 5-digit (XXXXX) or ZIP+4 (XXXXX-XXXX) format and must contain only numeric characters. ZIP codes that are incomplete, contain letters, or do not correspond to the entered state will be flagged as invalid. Incorrect ZIP codes can result in misdirected correspondence and processing delays.
11
Individual Practitioner Signature and Date Required for New Reassignment or 6A Termination
When establishing a new reassignment or when the individual practitioner is terminating a reassignment, Section 6A must include the individual practitioner's printed name, original signature, and a valid date signed (Date_Signed_mmddyyyy) in mm/dd/yyyy format. The form explicitly states that stamped, faxed, copied, or undated signatures will not be accepted. A missing or non-original signature in Section 6A will result in the application being rejected without processing.
12
Delegated/Authorized Official Signature and Date Required for New Reassignment or 6B Termination
When establishing a new reassignment or when the organization/group is terminating a reassignment, Section 6B must include the delegated or authorized official's printed name, original signature, and a valid date signed (Date_Signed_mmddyyyy_2) in mm/dd/yyyy format. The signature must be original and in blue ink, as stamped, faxed, or copied signatures are explicitly prohibited. Failure to provide a valid, dated original signature in Section 6B will cause the application to be returned unprocessed.
13
Printed Name in Certification Matches Signature in Certification
The printed first name, middle initial, last name, and suffix provided in the certification sections (6A and 6B) must match the corresponding signature fields. For Section 6A, the individual practitioner's printed name must correspond to the name in Section 3. For Section 6B, the delegated or authorized official's printed name must be consistent with their signature. Discrepancies between printed and signed names may indicate an unauthorized signature and will trigger additional scrutiny or rejection.
14
Contact Person Telephone Number Format Validation
If a contact person is provided in Section 5, the telephone number (CNTC_Phone) must be a valid 10-digit U.S. phone number, typically in the format (XXX) XXX-XXXX or XXX-XXX-XXXX, and must not contain letters or invalid area codes (e.g., area codes beginning with 0 or 1). While the contact person is optional, if their information is provided, the phone number is essential for the MAC to reach them with questions. An invalid phone number will render the contact information unusable.
15
Email Address Format Validation for Contact Person
If an email address is provided for the contact person (CNTC_Email), it must conform to a valid email format containing a local part, an '@' symbol, a domain name, and a valid top-level domain (e.g., [email protected]). The field must not contain spaces or invalid special characters. Although the email field is optional, an improperly formatted email address will prevent the MAC from using this communication channel, potentially delaying resolution of any questions about the application.
16
Consistency Between Individual Practitioner Name in Section 3 and Section 6A
The individual practitioner's first name, middle initial, last name, and suffix entered in Section 3 (Ind_FN, Ind_MI, Ind_LN, Ind_SFX) must be consistent with the printed name fields in Section 6A (Individual_Practitioner_First_Name_Print, Middle_Initial_3, Last_Name_Print_2, Jr_Sr_MD_etc_3). Any discrepancy between these two sections may indicate a data entry error or that an unauthorized individual has signed the certification. The MAC will flag inconsistencies and may return the application for clarification.
Common Mistakes in Completing CMS-855R
Many applicants fail to check the correct box in Section 1 when indicating their reason for submitting — whether they are establishing a new reassignment or terminating an existing one. This mistake often occurs because applicants do not read the instructions carefully or confuse the two scenarios. Selecting the wrong reason can result in the wrong sections being completed, causing the application to be rejected or processed incorrectly. Always read Section 1 carefully and verify which scenario applies before checking a box, and ensure you complete only the sections required for that scenario.
Applicants frequently enter a trade name or 'doing business as' name in Section 2 instead of the exact legal business name as reported to the IRS. The form explicitly requires the name to match what was reported on the organization's CMS-855B enrollment application. A mismatch will cause the MAC to reject or delay the application. Always verify the exact IRS-registered legal business name before completing this field, and cross-reference it with the organization's CMS-855B enrollment records. AI-powered tools like Instafill.ai can help auto-populate this field accurately from existing records.
Some applicants leave the TIN field blank or enter an incorrect number, such as transposing digits or confusing the EIN with the SSN. The TIN is a critical identifier used to match the organization's enrollment records, and any error will cause processing delays or outright rejection. Double-check the TIN against official IRS documentation before entering it, and ensure it corresponds to the organization/group, not the individual practitioner.
When an organization/group or individual practitioner is submitting their initial enrollment application at the same time as this reassignment application, the PTAN has not yet been issued. Many applicants leave the PTAN field blank instead of writing 'pending' as instructed. A blank field may cause the MAC to treat the application as incomplete and return it for correction. If a PTAN has not yet been issued because enrollment is concurrent, write 'pending' explicitly in the PTAN field for both Section 2 and Section 3 as applicable.
Applicants sometimes enter the SSN without dashes, with extra spaces, or with transposed digits in Section 3. The SSN is used to verify the individual practitioner's identity in Medicare records, and any formatting error or digit transposition can cause a mismatch that delays or rejects the application. Always enter the SSN in the standard XXX-XX-XXXX format and verify each digit carefully before submission. Tools like Instafill.ai can automatically validate SSN formatting to prevent these errors.
Both the organization/group (Section 2) and the individual practitioner (Section 3) must provide their respective NPIs, yet applicants frequently omit one or both, or enter the wrong NPI (e.g., entering the individual's NPI in the organization's field). The NPI is a mandatory identifier for Medicare enrollment, and missing or incorrect NPIs will result in the application being returned. Verify each NPI through the NPPES registry at nppes.cms.hhs.gov before entering it on the form.
Section 4 requires the primary practice location where the individual practitioner will render services most of the time, and this location must be currently enrolled or enrolling in Medicare. Applicants often enter a billing address, home address, or an unenrolled location instead of the correct enrolled practice location. This can cause the reassignment to be linked to an invalid location, leading to claim payment issues. Confirm that the practice location address matches what is on file with Medicare and that it has an active or pending enrollment status.
The form requires all dates to be entered in mm/dd/yyyy format, but applicants frequently use formats such as mm/dd/yy, yyyy/mm/dd, or write out the month name. Incorrect date formats can cause the application to be flagged as incomplete or result in the wrong effective date being recorded. Always use the exact mm/dd/yyyy format for the effective date in Section 1 and the signature dates in Section 6. AI-powered form filling tools like Instafill.ai can automatically format dates correctly to prevent this common error.
The form explicitly states that all signatures must be original and signed in blue ink, and that stamped, faxed, or copied signatures will not be accepted. Many applicants submit photocopies of signed forms or use electronic signature stamps, which results in automatic rejection of the application. Both the individual practitioner (Section 6A) and the delegated/authorized official of the organization/group (Section 6B) must provide wet ink, original signatures in blue ink on the physical form before mailing.
When establishing a new reassignment, Section 6A must be signed by the individual practitioner AND Section 6B must be signed by the delegated or authorized official of the organization/group. Applicants often submit the form with only one signature, either because the second party is unavailable or because the requirement is overlooked. An application missing either signature will not be processed. Coordinate with all required signatories before submitting, and review the signature requirements in Section 6 carefully.
The instructions clearly state that a separate CMS-855R must be submitted for each organization/group where a reassignment is being established or terminated. Applicants who are reassigning benefits to or terminating reassignments with multiple organizations frequently attempt to list multiple organizations on one form or attach addenda. This results in the application being returned or only partially processed. Prepare and submit a completely separate, fully completed CMS-855R for each organization/group involved.
Applicants sometimes mail the completed CMS-855R to the wrong MAC, to CMS headquarters in Baltimore (which is explicitly prohibited on the form), or to a MAC that did not process their initial enrollment. The MAC responsible for processing the reassignment application is the same one that processed the initial enrollment application. Sending it to the wrong address causes significant delays. Always verify the correct mailing address for your designated MAC at www.cms.gov/MedicareProviderSupEnroll before submitting.
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