My COA is correct. However, when I go to enter a bill, says the "account does not exist." Yet it DOES exist properly on the COA. How do I fix this?

A possible data damage might be causing the error when creating the bill, bdspoff29.

Data damage can be a result of an internal (within QuickBooks) or external (file location) factors. Let me share some steps with you that can resolve common data issues in QuickBooks. 

Here's how:

1. Go to the File menu, select Utilities, and then click Rebuild Data.
2. Click OK then follow the onscreen steps to save a backup.
3. Let the tool repair your file. It may take some time. QuickBooks may seem stuck, but as long as you can move your mouse, the tool is working.
4. When the tool finishes, select OK.
5. Go back to the File menu, select Utilities, and then click Verify Data.
6. Let the tool check your file for data issues.

You can also use the QuickBooks File Doctor if you still have data issues. Please open this article and follow the steps on how to use it: Fix company file and network issues with QuickBooks File Doctor.

Once done, create a sample bill to check if you can already use the account. You can also add a reply below if you still need help with this.