What this is
IRS tax letters verify your organization’s EIN (Employer Identification Number). Insurance payers, clearinghouses, and other entities may require one of these letters during onboarding to confirm your tax ID is active and correctly linked to your legal business name.
Why we need it
Your EIN is like a Social Security number for your business. Payers use it to match your practice with tax records, validate your group enrollment, and ensure claims are tied to the right entity. Submitting an official IRS-issued letter avoids delays and ensures compliance.
Accepted Documents
We can accept any of the following official documents from the IRS as proof of EIN:
- CP-575 Letter
Issued when you first receive your EIN. It’s the original confirmation notice mailed by the IRS. - 147C Letter
Used as a replacement when the CP-575 is lost. You can request this over the phone from the IRS.
Don’t have either letter?
If you never received or can’t locate these documents, you can request a 147C letter by calling the IRS Business & Specialty Tax Line at 1-800-829-4933. The IRS will fax the letter to you–be prepared to verify your business details.
Related Articles
- What is an EIN?
- CP-575 Letter
- 147C Letter