EIN (Employer Identification Number)

A unique number assigned by the IRS to identify your business for tax and credentialing purposes.

What is an EIN?

An EIN (Employer Identification Number) is a unique nine-digit number assigned by the IRS to identify your business for tax purposes. Think of it as a Social Security number for your organization—it’s required for everything from payroll and tax filings to credentialing and insurance enrollment.

Why Do We Ask for Your EIN?

Insurance payors require your EIN to verify that your business is properly registered and eligible for reimbursement. Your EIN must match the business name exactly in IRS records. Even small differences—like punctuation or abbreviations—can delay your credentialing, stall payments, or result in rejected applications.

Payors use your EIN to:

• Match your business against government records

• Verify the legitimacy of your practice

• Link claims to the correct tax ID for reimbursement

Where to Find Your EIN

Your EIN can typically be found on:

• Your CP-575 Letter (the original IRS confirmation notice)

• A 147C Letter (if the CP-575 was lost)

• Your tax filings (such as Form 941 or 990)

• Your business formation documents

• Your W-9 (if previously completed)

What If You Don’t Know Your EIN?

If you're not sure what your EIN is or can’t find it:

• Check with your accountant or whoever handled your business formation

• Look at old tax filings, W-9s, or payroll records

• Contact the IRS Business & Specialty Tax Line at 1-800-829-4933 to request a 147C Letter, which will confirm your EIN

Be cautious not to guess or use a personal SSN by mistake

insurance credentialing teams require the correct number tied to your legal business name.

Best Practices for Credentialing

• Double-check that your EIN matches your legal business name on file with the IRS

• Use official documentation (CP-575 or 147C) to avoid rejections

• Keep your EIN documents in your records for future enrollments or audits

• Ensure consistency across your W-9, NPI registration, and payor applications

Need Help or Have a Question?

[email protected] 800-799-3859 piehealthusa.com