| Code | Description | Comment | Version |
| 0 | Normal grouping | | added v2.6 |
| 1 | Invalid or missing primary diagnosis | | added v2.6 |
| 2 | Diagnosis is not allowed to be primary | | added v2.6 |
| 3 | Data does not fulfill DRG criteria | | added v2.6 |
| 4 | Invalid age, admission date, date of birth or discharge date | | added v2.6 |
| 5 | Invalid gender | | added v2.6 |
| 6 | Invalid discharge status | | added v2.6 |
| 7 | Invalid weight ad admission | | added v2.6 |
| 8 | Invalid length of stay | | added v2.6 |
| 9 | Invalid field "same day" | | added v2.6 |