| K90 | Intestinal malabsorption |
| K90.0 | Celiac disease |
| K90.1 | Tropical sprue |
| K90.2 | Blind loop syndrome, not elsewhere classified |
| K90.3 | Pancreatic steatorrhea |
| K90.4 | Malabsorption due to intolerance, not elsewhere classified |
| K90.8 | Other intestinal malabsorption |
| K90.81 | Whipple's disease |
| K90.89 | Other intestinal malabsorption |
| K90.9 | Intestinal malabsorption, unspecified |
| K91 | Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified |
| K91.0 | Vomiting following gastrointestinal surgery |
| K91.1 | Postgastric surgery syndromes |
| K91.2 | Postsurgical malabsorption, not elsewhere classified |
| K91.3 | Postprocedural intestinal obstruction |
| K91.5 | Postcholecystectomy syndrome |
| K91.6 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a procedure |
| K91.61 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a digestive sytem procedure |
| K91.62 | Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating other procedure |
| K91.7 | Accidental puncture and laceration of a digestive system organ or structure during a procedure |
| K91.71 | Accidental puncture and laceration of a digestive system organ or structure during a digestive system procedure |
| K91.72 | Accidental puncture and laceration of a digestive system organ or structure during other procedure |
| K91.8 | Other intraoperative and postprocedural complications and disorders of digestive system |
| K91.81 | Other intraoperative complications of digestive system |
| K91.82 | Postprocedural hepatic failure |
| K91.83 | Postprocedural hepatorenal syndrome |
| K91.84 | Postprocedural hemorrhage and hematoma of a digestive system organ or structure following a procedure |
| K91.840 | Postprocedural hemorrhage and hematoma of a digestive system organ or structure following a digestive system procedure |
| K91.841 | Postprocedural hemorrhage and hematoma of a digestive system organ or structure following other procedure |
| K91.85 | Complications of intestinal pouch |
| K91.850 | Pouchitis |
| K91.858 | Other complications of intestinal pouch |
| K91.86 | Retained cholelithiasis following cholecystectomy |
| K91.89 | Other postprocedural complications and disorders of digestive system |
| K92 | Other diseases of digestive system |
| K92.0 | Hematemesis |
| K92.1 | Melena |
| K92.2 | Gastrointestinal hemorrhage, unspecified |
| K92.8 | Other specified diseases of the digestive system |
| K92.81 | Gastrointestinal mucositis (ulcerative) |
| K92.89 | Other specified diseases of the digestive system |
| K92.9 | Disease of digestive system, unspecified |
| K94 | Complications of artificial openings of the digestive system |
| K94.0 | Colostomy complications |
| K94.00 | Colostomy complication, unspecified |
| K94.01 | Colostomy hemorrhage |
| K94.02 | Colostomy infection |
| K94.03 | Colostomy malfunction |
| K94.09 | Other complications of colostomy |
| K94.1 | Enterostomy complications |
| K94.10 | Enterostomy complication, unspecified |
| K94.11 | Enterostomy hemorrhage |
| K94.12 | Enterostomy infection |
| K94.13 | Enterostomy malfunction |
| K94.19 | Other complications of enterostomy |
| K94.2 | Gastrostomy complications |
| K94.20 | Gastrostomy complication, unspecified |
| K94.21 | Gastrostomy hemorrhage |
| K94.22 | Gastrostomy infection |
| K94.23 | Gastrostomy malfunction |
| K94.29 | Other complications of gastrostomy |
| K94.3 | Esophagostomy complications |
| K94.30 | Esophagostomy complications, unspecified |
| K94.31 | Esophagostomy hemorrhage |
| K94.32 | Esophagostomy infection |
| K94.33 | Esophagostomy malfunction |
| K94.39 | Other complications of esophagostomy |
| K95 | Complications of bariatric procedures |
| K95.0 | Complications of gastric band procedure |
| K95.01 | Infection due to gastric band procedure |
| K95.09 | Other complications of gastric band procedure |
| K95.8 | Complications of other bariatric procedure |
| K95.81 | Infection due to other bariatric procedure |
| K95.89 | Other complications of other bariatric procedure |