Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified
In Other diseases of the digestive system (K90-K95), chapter 11: Diseases of the Digestive System
24 billable codes under K91: 21 are a CC; 2 map to HCC 463 (Artificial Openings for Feeding or Elimination).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes2: not included here, code separately if applicable
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
There are no chapter-specific rules for Chapter 11 yet, so the general rules in Section I.B apply.
All codes under K91
K91 can't be used on a claim. Pick a billable code below; grey headings group them.
- K91.0Vomiting following gastrointestinal surgery
- K91.1Postgastric surgery syndromes
- K91.2Postsurgical malabsorption, not elsewhere classified
- K91.3Postprocedural intestinal obstruction
- K91.30Postprocedural intestinal obstruction, unspecified as to partial versus complete
- K91.31Postprocedural partial intestinal obstruction
- K91.32Postprocedural complete intestinal obstruction
- K91.5Postcholecystectomy syndrome
- K91.6Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a procedure
- K91.61Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a digestive system procedure
- K91.62Intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating other procedure
- K91.7Accidental puncture and laceration of a digestive system organ or structure during a procedure
- K91.71Accidental puncture and laceration of a digestive system organ or structure during a digestive system procedure
- K91.72Accidental puncture and laceration of a digestive system organ or structure during other procedure
- K91.8Other intraoperative and postprocedural complications and disorders of digestive system
- K91.81Other intraoperative complications of digestive system
- K91.82Postprocedural hepatic failure
- K91.83Postprocedural hepatorenal syndrome
- K91.84Postprocedural hemorrhage of a digestive system organ or structure following a procedure
- K91.840Postprocedural hemorrhage of a digestive system organ or structure following a digestive system procedure
- K91.841Postprocedural hemorrhage of a digestive system organ or structure following other procedure
- K91.85Complications of intestinal pouch
- K91.850Pouchitis
- K91.858Other complications of intestinal pouch
- K91.86Retained cholelithiasis following cholecystectomy
- K91.87Postprocedural hematoma and seroma of a digestive system organ or structure following a procedure
- K91.870Postprocedural hematoma of a digestive system organ or structure following a digestive system procedure
- K91.871Postprocedural hematoma of a digestive system organ or structure following other procedure
- K91.872Postprocedural seroma of a digestive system organ or structure following a digestive system procedure
- K91.873Postprocedural seroma of a digestive system organ or structure following other procedure
- K91.89Other postprocedural complications and disorders of digestive system
K91 MS-DRGs
As the principal diagnosis, the billable codes under K91 group to these 16 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 791 Prematurity with Major Problems (13 of 24 codes)
- DRG 793 Full Term Neonate with Major Problems (13 of 24 codes)
- DRG 919 Complications of Treatment with MCC (10 of 24 codes)
- DRG 920 Complications of Treatment with CC (10 of 24 codes)
- DRG 921 Complications of Treatment without CC/MCC (10 of 24 codes)
- DRG 393 Other Digestive System Diagnoses with MCC (7 of 24 codes)
- DRG 394 Other Digestive System Diagnoses with CC (7 of 24 codes)
- DRG 395 Other Digestive System Diagnoses without CC/MCC (7 of 24 codes)
- DRG 388 Gastrointestinal Obstruction with MCC (3 of 24 codes)
- DRG 389 Gastrointestinal Obstruction with CC (3 of 24 codes)
- DRG 390 Gastrointestinal Obstruction without CC/MCC (3 of 24 codes)
- DRG 391 Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC (3 of 24 codes)
- DRG 392 Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC (3 of 24 codes)
- DRG 444 Disorders of the Biliary Tract with MCC (1 of 24 codes)
- DRG 445 Disorders of the Biliary Tract with CC (1 of 24 codes)
- DRG 446 Disorders of the Biliary Tract without CC/MCC (1 of 24 codes)
Other codes that refer to K91
Notes on these codes point to K91.
- T81 Excludes2: intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Digestive Diseases
When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion. Your digestive system is a series of hollow organs joined in a long, twisting tube. It runs from your mouth to your anus and includes your esophagus, stomach, and small and large intestines. Your liver, gallbladder and pancreas are also involved. They produce juices to help digestion.
Read more about digestive diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.