It means that you did not do your ICD-10 correctly. It means the ICD-10 code you used does not have ICD-10 in it, it might look like an ICD-10 code to you, but each code has three fields: a code field, ICD-9 field, and an ICD-10 field. When its red, that means one of the other fields are empty. This link is step by step on how to get ready for ICD-10:
https://microwize.com/icd-10-checklist-white-paper-for-medisoft/
The link has multiple sections, make sure you visit each section. If you need additional help, you should consider the ICD-10 coaching package.