| K91 | Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified | NON-BILLABLE CODE |
| K91.0 | Vomiting following gastrointestinal surgery | BILLABLE CODE |
| K91.1 | Postgastric surgery syndromes | BILLABLE CODE |
| K91.2 | Postsurgical malabsorption, not elsewhere classified | BILLABLE CODE |
| K91.3 | Postprocedural intestinal obstruction | NON-BILLABLE CODE |
| K91.31 | Postprocedural partial intestinal obstruction | BILLABLE CODE |
| K91.32 | Postprocedural complete intestinal obstruction | BILLABLE CODE |
| K91.5 | Postcholecystectomy syndrome | BILLABLE CODE |
| K91.6 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a procedure | NON-BILLABLE CODE |
| K91.61 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a digestive system procedure | BILLABLE CODE |
| K91.62 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating other procedure | BILLABLE CODE |
| K91.7 | Accidental puncture and laceration of a digestive system organ or structure during a procedure | NON-BILLABLE CODE |
| K91.71 | Accidental puncture and laceration of a digestive system organ or structure during a digestive system procedure | BILLABLE CODE |
| K91.72 | Accidental puncture and laceration of a digestive system organ or structure during other procedure | BILLABLE CODE |
| K91.8 | Other intraoperative and postprocedural complications and disorders of digestive system | NON-BILLABLE CODE |
| K91.81 | Other intraoperative complications of digestive system | BILLABLE CODE |
| K91.82 | Postprocedural hepatic failure | BILLABLE CODE |
| K91.83 | Postprocedural hepatorenal syndrome | BILLABLE CODE |
| K91.84 | Postprocedural hemorrhage of a digestive system organ or structure following a procedure | NON-BILLABLE CODE |
| K91.840 | Postprocedural hemorrhage of a digestive system organ or structure following a digestive system procedure | BILLABLE CODE |
| K91.841 | Postprocedural hemorrhage of a digestive system organ or structure following other procedure | BILLABLE CODE |
| K91.85 | Complications of intestinal pouch | NON-BILLABLE CODE |
| K91.850 | Pouchitis | BILLABLE CODE |
| K91.858 | Other complications of intestinal pouch | BILLABLE CODE |
| K91.86 | Retained cholelithiasis following cholecystectomy | BILLABLE CODE |
| K91.87 | Postprocedural hematoma and seroma of a digestive system organ or structure following a procedure | NON-BILLABLE CODE |
| K91.870 | Postprocedural hematoma of a digestive system organ or structure following a digestive system procedure | BILLABLE CODE |
| K91.871 | Postprocedural hematoma of a digestive system organ or structure following other procedure | BILLABLE CODE |
| K91.872 | Postprocedural seroma of a digestive system organ or structure following a digestive system procedure | BILLABLE CODE |
| K91.873 | Postprocedural seroma of a digestive system organ or structure following other procedure | BILLABLE CODE |
| K91.89 | Other postprocedural complications and disorders of digestive system | BILLABLE CODE |
