Problem: MS-DRG 999 is typically used as a placeholder for cases that do not fit into any specific DRG category or are incomplete. The CMS Weight of 0.00 indicates that there was no resource allocation for the case, which may suggest that the case was not properly documented or that there were no billable services provided. This assignment usually occurs when there are coding errors, missing information, or if the patient did not receive any significant treatment. Want Online Tutoring?