W-9 Form

Last updated May 4, 2026

What is a W-9 Form?

A W-9 form is an official IRS document used to provide a business’s Taxpayer Identification Number (TIN) to entities that need it for tax reporting. In the context of provider credentialing, insurance companies require a W-9 to verify your EIN (Employer Identification Number) or Social Security Number (SSN) before processing claims and issuing payments.

Why Do Insurance Payors Require a W-9?

Insurance payors use the W-9 to confirm that your business name and EIN match IRS records. This ensures that payments are made to the correct entity and reported accurately for tax purposes.

A mismatch between your W-9, CP-575, and other credentialing documents can result in:

  • Delays in credentialing approval
  • Payment rejections or misapplied funds
  • Additional verification requests from the insurance payor

Where to Get a W-9 Form

The IRS does not issue W-9 forms directly to businesses. Instead, you must fill one out yourself and submit it to the requesting entity.You can download a blank W-9 form from the IRS website: Download the W-9 (2024) version.

Once completed, the W-9 should be provided to pie for submission with your credentialing application.

What If My W-9 Does Not Match My CP-575?

Payors will compare your W-9 with your CP-575 (or 147C Letter, if applicable) to ensure the business name and EIN are identical. If there is any inconsistency, your credentialing application may be delayed or rejected.

Common Issues That Cause Delays

  • Business name discrepancies – Ensure the name on your W-9 exactly matches your CP-575.
  • Incorrect EIN or SSN – Double-check that the tax identification number is correct.
  • Outdated W-9 – If your business name, structure, or EIN has changed, update your W-9 before submitting it.

If your business name has changed, you must update your records with the IRS before completing a new W-9.

Best Practices for Credentialing

  • Always use the exact legal business name as it appears on your CP-575.
  • Verify all tax identification numbers before submitting to avoid errors.
  • If your business structure changes, file an updated W-9 to reflect the new details.
  • Provide a signed and dated W-9 when submitting credentialing paperwork.

At pie, we handle the credentialing process and ensure that all submitted documents are correct. However, only the provider can complete and update their W-9. If your business details have changed, be sure to update your IRS records first.