Non-billable Codes
This is a great tool to use to locate all the billable & non-billable ICD10 codes.
https://www.icd10data.com/ICD10CM/Codes/Rules/Non_Billable_Specific_Codes
On this site, Billable Code will be in green - Non Billable will show in red, they will provide a list of alternative billable codes in which you can chose from.