CP-575 Letter

Official documents from the IRS used to verify your EIN during onboarding and credentialing.

What is a CP-575 Letter?

A CP-575 letter is an official document issued by the Internal Revenue Service (IRS) to confirm that a business has been assigned an Employer Identification Number (EIN). This letter serves as proof of your business’s EIN and legal name.

Why Do Insurance Payors Require a CP-575?

During the provider credentialing process, insurance companies verify that your EIN and business name exactly match the records held by the IRS. The CP-575 is the primary document used for this verification.If there are any discrepancies—such as a missing comma, different abbreviations, or an outdated business name—your application may be delayed or rejected. This can lead to delays in enrollment and payment processing.

How to Find Your CP-575 Letter

If your organization applied for an EIN, the IRS sent the CP-575 to the address on file at the time of registration. You may find a copy in your:

• Business formation documents

• Files from your accountant or attorney

• Online records, if you received a digital version

What If You Lost Your CP-575?

The IRS does not reissue CP-575 letters. If you no longer have it, you must request a replacement document called a 147C Letter.

How to Request a 147C Letter from the IRS

To obtain a 147C Letter (which serves the same verification purpose as a CP-575), follow these steps:

1. Call the IRS Business & Specialty Tax Line at 1-800-829-4933.

2. Select the option for EIN inquiries.

3. Verify your identity (you must be authorized to request EIN information).

4. Request a 147C Letter to confirm your EIN.

5. The IRS will mail or fax the letter (email is not an option).

Processing Time Warning:

The 147C Letter can take up to 4–6 weeks to arrive. If you’re missing your CP-575, request a 147C Letter as soon as possible to avoid credentialing delays.

Common Issues That Cause Delays

To prevent problems, make sure your CP-575:

• Matches your W-9 exactly – Business name, spelling, and punctuation should be identical.

• Reflects any name changes – If your business name has changed, update it with the IRS before submitting credentialing documents.

• Aligns with your NPI and banking details – All credentialing paperwork should be consistent to prevent rejections.

Best Practices for Credentialing

• Keep a copy of your CP-575 in your business records to prevent last-minute delays.

• If you’re missing it, request a 147C Letter immediately to avoid enrollment slowdowns.

• Verify all documents match before submitting credentialing applications to insurance payors.

Need Help or Have a Question?

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