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Outline

The CMS-40B form plays a crucial role in the Medicare enrollment process, specifically for individuals seeking to apply for or change their Medicare Part B coverage. This form is designed for those who are eligible for Medicare but have not yet enrolled, as well as for those who wish to make changes to their existing coverage. Completing the CMS-40B form accurately is essential, as it ensures that applicants receive the benefits they are entitled to without unnecessary delays. The form requires personal information, including name, address, and Social Security number, and may also ask for details about previous health coverage. Understanding the submission process is vital, as it can affect the effective date of coverage. In addition, applicants must be aware of the deadlines associated with enrollment periods to avoid penalties. Overall, the CMS-40B form serves as a key document in navigating the complexities of Medicare Part B enrollment.

Sample - CMS-40B Form

CMS-40B (07/2025)
Request for Enrollment in Medicare Part B
(Medical Insurance)
Use this form if you already have Medicare Part A and want to sign up for Part B (Medical Insurance). You
can use this form to sign up for Part B during these times:
During your Initial Enrollment Period
During the General Enrollment Period from January 1–March 31 each year
If you’re eligible for a Special Enrollment Period
If you don’t have Part A, don’t complete this application. Contact Social Security to apply for
Medicare for the first time.
Visit Medicare.gov/basics/get-started-with-medicare to learn more about when you can sign up for
Medicare, when your coverage can start, and special situations for people under 65 with a disability.
Submit your form by mail or fax
Mail or fax your completed, signed form to your local Social Security office. Find an office near you at
SSA.gov/locator.
Get help with this form
Phone: Call Social Security at 1-800-772-1213. TTY users call 1-800-325-0778.
En Español: Llame a SSA gratis al 1-800-772-1213 y oprima el 2 si desea el servicio en Español y espere a
que le atienda un agente.
For an office near you visit SSA.gov/locator.
State Health Insurance Assistance Program (SHIP): Visit shiphelp.org to get free, personalized, and
unbiased health insurance counseling from your local SHIP.
Get information in another format
You have the right to get Medicare information in an accessible format, like large print, braille, or
audio. You also have the right to file a complaint if you feel you’ve been discriminated against. Visit
Medicare.gov/about-us/accessibility-nondiscrimination-notice, or call 1-800-MEDICARE (1-800-633-4227)
for more information. TTY users can call 1-877-486-2048.
1
CMS-40B (07/2025)
Request for Enrollment in Medicare Part B (Medical Insurance)
Section 1: Basic information
1. Medicare Number
2. First name Middle name Last name Suffix
3. Mailing address (number and street, P.O. Box, or route)
City State
ZIP code
4. Phone number 5. Email address
U.S. Department of Health and Human Services
Centers for Medicare & Medicaid Services
Form Approved
OMB No. 0938-1230
Expires: 07/31/2028
Section 2: Enrollment in Medicare Part B
1. Do you have (or did you have) coverage through an employer or union group health plan
since you turned 65? (If yes, complete item 3.) .........................................................................................................
Yes 
No
Note: If you sign up for Part B, you must pay premiums for every month you have the coverage.
2. Are you currently (or were you) an international volunteer for a non-profit organization that
provided health coverage to you? (If yes, complete item 3.) .................................................................................
Yes 
No
3. Enter dates of employment (or volunteer work) and health coverage (enter dates as mm/yyyy). Attach a
separate sheet if you need more space. Have your employer fill out the form CMS-L564 (Request for Employment
Information) and return it with your application.
Dates you (or your spouse) worked for an employer that provided health coverage
Start date:
  
End date:
Not ended
Dates you worked as a volunteer outside the U.S.
Start date:
  
End date:
Not ended
Dates of health coverage from employer (or non-profit organization)
Start date:
  
End date:
Not ended
4. Has an employer, health insurance provider, or other entity asked or required you to enroll in Part B?
(If yes, explain how and why in the space below, and include proof or documentation
with this form.) ..........................................................................................................................................................................
Yes  No
Choose your coverage start date
If you’re enrolling in Medicare while you’re still covered by a group health plan based on current employment
(or during the first full month you’re not enrolled in the group health plan), you can choose when your Medicare
coverage will start. Choose one:
The first day of the month you enroll
The first day of any of the 3 months after you enroll. Write the month and year you want coverage to start:
(mm/yyyy)
2
CMS-40B (07/2025)
Section 3: Signature(s)
1. Signature of applicant 2. Date signed (mm/dd/yyyy)
If this form has been signed by mark (X), a witness who knows the person applying must also sign below:
3. Name of witness (first and last name)
4. Signature of witness 5. Date signed (mm/dd/yyyy)
Submit your form by mail or fax
Mail or fax your completed, signed form to your local Social Security office. Find an office near you at
SSA.gov/locator.
Paperwork Reduction Act: According to the Paperwork Reduction Act of 1995, no persons are required to respond to a collection of
information unless it displays a valid OMB control number. The valid OMB control number for this information collection is 0938-1230.
The time required to complete this information is estimated to average 15 minutes per response, including the time to review
instructions, search existing data resources, gather the data needed, and complete and review the information collection. If you have
any comments concerning the accuracy of the time estimate(s) or suggestions for improving this form, please write to: CMS, Attn: PRA
Reports Clearance Ocer, 7500 Security Boulevard, Baltimore, Maryland 21244-1850. Important: Do not send this form or any items
with your personal information (such as claims, payments, medical records, etc.) to the PRA Reports Clearance Oce. Any items we get
that aren’t about how to improve this form or its collection burden (outlined in OMB 0939-0251) will be destroyed. It will not be kept,
reviewed, or forwarded to Social Security or any other agency.
Privacy Act Statement: Sections 1837, 1838 and 1872 of the Social Security Act, as amended, allow SSA to collect this information.
Furnishing this information is voluntary. However, failing to provide all or part of the information may prevent an accurate and timely
decision on any claim filed for medical insurance and/or hospital insurance.
We will use the information you provide to determine your eligibility for benefits. We may also share the information for the following
purposes, called routine uses: 1) To Federal, State, or local agencies (or agents on their behalf) for administering income maintenance
or health maintenance programs (including programs under the Social Security Act). Such disclosure includes, but are not limited to,
release of information to: Railroad Retirement Board for administering provision of the Railroad Retirement Act relating to railroad
employment; for administering the Railroad Unemployment Insurance Act and for administering provisions of the Social Security Act
relating to railroad employment; 2) Department of Veterans Aairs for administering 38 U.S.C. 1312, and upon request, for determining
eligibility for, or amount of, veterans benefits or verifying other information with respect thereto pursuant to 38 U.S.C. 5106; 3) State
welfare departments for administering sections 205(c)(2)(B)(i)(II) and 402(a)(25) of the Social Security Act requiring information
about assigned Social Security numbers for Temporary Assistance for Needy Families (TANF) program purposes and for determining a
recipient’s eligibility under the TANF program; and 4) State agencies for administering the Medicaid program.
To contractors and other Federal agencies, as necessary, for the purpose of assisting the Social Security Administration (SSA) in the
ecient administration of its programs. We will disclose information under the routine use only in situations in which SSA may enter
into a contractual or similar agreement with a third party to assist in accomplishing an agency function relating to this system of
records.
In addition, we may share this information in accordance with the Privacy Act and other Federal laws. For example, where authorized,
we may use and disclose this information in computer matching programs, in which our records are compared with other records to
establish or verify a person’s eligibility for Federal benefit programs and for repayment of incorrect or delinquent debts under these
programs.
A list of additional routine uses is available in our Privacy Act System of Records Notice (SORN) 60-0090, entitled Master Beneficiary
Record, as published in the Federal Register (FR) on January 11, 2006, at 71 FR 1826. Additional information, and a full listing of all of our
SORNs, is available on our website at SSA.gov/privacy.
CMS will maintain records received during eligibility determinations from SSA in a CMS System of Records, the Medicare
Beneficiary Database (MBD) SORN 09-70-0536 as published in the Federal Register (FR) on February 14, 2018, at 71 FR 11420.
Additional information on CMS SORNs and permissible Routine Uses for disclosure can be located at our Privacy website
HHS.gov/foia/privacy/sorns/index.html.

Form Information

Fact Name Details
Purpose The CMS-40B form is used to apply for Medicare Part B coverage.
Eligibility Individuals who are 65 years or older or those under 65 with certain disabilities can apply using this form.
Filing Deadline Applications should be submitted during the initial enrollment period, which lasts for seven months.
Governing Laws This form is governed by federal laws related to Medicare, specifically Title XVIII of the Social Security Act.

Detailed Guide for Filling Out CMS-40B

After obtaining the CMS-40B form, you will need to fill it out accurately to ensure a smooth processing experience. Follow the steps below to complete the form correctly.

  1. Start by providing your personal information. Fill in your name, address, and contact details in the designated fields.
  2. Next, indicate your Medicare number, if applicable. This is essential for identification purposes.
  3. Provide your date of birth. Ensure that you enter it in the correct format to avoid any delays.
  4. Check the boxes that apply to your situation. This may include options related to your enrollment status or eligibility.
  5. Review your answers for accuracy. Double-check all information entered on the form.
  6. Sign and date the form at the bottom. Your signature confirms that the information provided is true and complete.
  7. Make a copy of the completed form for your records before submission.
  8. Submit the form as directed, either by mail or electronically, depending on the instructions provided.

Following these steps will help ensure that your form is filled out correctly and submitted on time.

Obtain Answers on CMS-40B

  1. What is the CMS-40B form?

    The CMS-40B form is an application used by individuals to enroll in Medicare Part B. This part of Medicare provides coverage for outpatient care, including doctor visits, preventive services, and some medical equipment. Completing this form is essential for those who are eligible and wish to receive these benefits.

  2. Who should fill out the CMS-40B form?

    Individuals who are eligible for Medicare and wish to enroll in Part B should complete the CMS-40B form. This typically includes those who are turning 65, people under 65 with certain disabilities, and individuals with End-Stage Renal Disease (ESRD). It is important to fill out this form if you want to avoid any gaps in coverage.

  3. How do I submit the CMS-40B form?

    After completing the CMS-40B form, you can submit it in several ways:

    • Mail the form to your local Social Security office.
    • Bring the form in person to your local Social Security office.
    • Submit the form online through the Social Security Administration's website, if you are eligible to do so.

    Ensure that you keep a copy of the submitted form for your records. This will help you track your enrollment status.

  4. What happens after I submit the CMS-40B form?

    Once you submit the CMS-40B form, the Social Security Administration will process your application. You will receive a confirmation of your enrollment in Medicare Part B, usually within a few weeks. If there are any issues or additional information needed, they will contact you directly. It is advisable to follow up if you do not receive any communication within a reasonable time frame.

Common mistakes

Filling out the CMS-40B form can be a straightforward process, but many people make common mistakes that can delay their applications or lead to unnecessary complications. One frequent error is providing incomplete personal information. It’s crucial to include your full name, address, and date of birth accurately. Omitting even a small detail can result in processing delays.

Another common mistake is misunderstanding the eligibility requirements. Applicants often assume they qualify without thoroughly reviewing the criteria. This can lead to wasted time and effort. Always double-check the guidelines to ensure you meet all necessary conditions before submitting your application.

Additionally, many individuals fail to sign and date the form. This might seem minor, but it’s essential. Without your signature, the application is not considered valid. Make it a point to review the form thoroughly before submission to ensure all required fields are completed, including your signature.

Lastly, some applicants neglect to keep a copy of their completed form. This oversight can create problems if there are questions about your application later on. Retaining a copy allows you to reference your submission and provides a record of what you provided. Always make a copy for your records before sending in your application.

Documents used along the form

The CMS-40B form is used to apply for Medicare Part B, which provides medical insurance for eligible individuals. When completing this form, applicants may also need to submit several other documents to ensure their application is processed smoothly. Below is a list of common forms and documents that are often used alongside the CMS-40B.

  • CMS-40A: This form is used to apply for Medicare Part A, which covers hospital insurance. It is important for individuals who are eligible for both Part A and Part B.
  • CMS-L564: This document serves as a request for employment information. It helps verify eligibility for special enrollment periods based on current or recent employment.
  • Form SSA-44: This form is used to request a reduction in income-related monthly adjustment amounts (IRMAA) for Medicare premiums. It is relevant for those who experience a significant drop in income.
  • Form SSA-1099: This form provides information about Social Security benefits. It is often required to verify income when applying for Medicare.
  • Medicare Card: A copy of your Medicare card may be needed to confirm existing coverage or to provide proof of eligibility.
  • Proof of Citizenship or Legal Residency: Documents like a birth certificate or a passport may be required to establish eligibility for Medicare.
  • Income Documentation: Recent tax returns or pay stubs may be requested to determine eligibility for certain Medicare programs or adjustments.
  • Power of Attorney (if applicable): If someone else is completing the application on behalf of the applicant, a power of attorney document may be necessary to authorize that individual.

Having these documents ready can streamline the application process for Medicare Part B. It's advisable to review each requirement carefully to ensure a complete and accurate submission.

Similar forms

The CMS-40B form is used for applying for Medicare Part B. Several other documents serve similar purposes in healthcare and insurance applications. Here are seven documents that share similarities with the CMS-40B form:

  • CMS-40A Form: This form is also related to Medicare, specifically for those applying for Medicare Part A. It collects information about eligibility and enrollment.
  • CMS-1763 Form: This document is used to request a voluntary termination of Medicare Part B coverage. It allows beneficiaries to officially withdraw from the program.
  • CMS-855I Form: This is the enrollment application for individual providers who want to participate in Medicare. It requires similar personal and professional information.
  • CMS-855B Form: This form is for institutional providers. Like the CMS-40B, it facilitates enrollment in Medicare but focuses on group practices and healthcare facilities.
  • CMS-10114 Form: This is the application for Medicare Savings Programs. It helps individuals apply for assistance with Medicare costs, sharing a focus on financial eligibility.
  • Form SSA-16: This Social Security Administration form is for applying for Social Security Disability Insurance (SSDI). It requires personal information and details about work history, similar to the CMS-40B.
  • Form SSA-44: This form is used to request a reduction in the amount of income that is counted for purposes of determining eligibility for Medicare Savings Programs, paralleling the financial assessment aspect of the CMS-40B.

Dos and Don'ts

When filling out the CMS-40B form, it is important to follow certain guidelines to ensure accuracy and efficiency. Here are some do's and don'ts to keep in mind:

  • Do read the instructions carefully before starting the form.
  • Do provide accurate personal information, including your name and address.
  • Do double-check your Social Security number for accuracy.
  • Do sign and date the form where required.
  • Don't leave any required fields blank; fill them in completely.
  • Don't use abbreviations that may confuse the reviewer.
  • Don't submit the form without reviewing it for errors.

By following these guidelines, you can help ensure that your CMS-40B form is processed smoothly and efficiently.

Misconceptions

The CMS-40B form, also known as the "Application for Enrollment in Medicare Part B," is often surrounded by misconceptions. Understanding the truth behind these myths can help individuals navigate the Medicare enrollment process more effectively. Here are eight common misconceptions about the CMS-40B form:

  • Myth 1: You can only apply for Medicare Part B during a specific enrollment period.
  • Truth: While there are designated enrollment periods, you can apply for Medicare Part B during the General Enrollment Period if you missed your Initial Enrollment Period.
  • Myth 2: You need to apply for Medicare Part B if you already receive Social Security benefits.
  • Truth: If you are already receiving Social Security benefits, you are automatically enrolled in Medicare Part B.
  • Myth 3: The CMS-40B form is only for people who are retiring.
  • Truth: Anyone who qualifies for Medicare can use the CMS-40B form to apply, regardless of their employment status.
  • Myth 4: Submitting the CMS-40B form guarantees immediate coverage.
  • Truth: Coverage begins only after your application is processed and the appropriate enrollment period has passed.
  • Myth 5: You can submit the CMS-40B form online.
  • Truth: Currently, the form must be printed, filled out, and mailed to your local Social Security office.
  • Myth 6: There is no fee associated with submitting the CMS-40B form.
  • Truth: While there is no fee to submit the form itself, there may be premiums associated with Medicare Part B coverage.
  • Myth 7: You can apply for Medicare Part B at any time without consequences.
  • Truth: Delaying your application may result in a late enrollment penalty, which can increase your monthly premium.
  • Myth 8: The CMS-40B form is the only document needed for Medicare enrollment.
  • Truth: Depending on your situation, you may need to provide additional documentation, such as proof of citizenship or residency.

By debunking these misconceptions, individuals can better understand the CMS-40B form and navigate their Medicare enrollment journey with confidence.

Key takeaways

The CMS-40B form is essential for individuals seeking to apply for Medicare Part B. Understanding how to fill it out correctly can significantly impact your healthcare coverage. Here are some key takeaways to consider:

  • Eligibility Requirements: Ensure that you meet the eligibility criteria before filling out the form. This typically includes age, disability status, or specific health conditions.
  • Accurate Information: Provide accurate and complete information. Any discrepancies can lead to delays in processing your application.
  • Submission Methods: Be aware of the various ways to submit the form. You can mail it, or in some cases, submit it online or in person at your local Social Security office.
  • Follow-Up: After submission, keep track of your application status. This can help you address any issues that may arise during the review process.