2026 ICD-10-CM Diagnosis Code K91.89Other postprocedural complications and disorders of digestive system
ICD-10-CM Codes›K00–K95›K90-K95›K91
- Billable — Valid for Submission
- Not Chronic
K91.89 is a billable ICD-10-CM diagnosis code for other postprocedural complications and disorders of digestive system. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative digestive system complication.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anastomotic biliary stricture
- Anastomotic necrosis of small intestine
- Anastomotic stricture of small intestine
- Anorectal stricture
- Bile duct leakage
- Bile leakage after removal of T-tube
- Bile peritonitis
- Biliary anastomotic leak
- Biliary stricture
- Burn of colon
- Chronic pain following cholecystectomy
- Cirrhosis of liver due to and following cardiac procedure
- Crohn's disease of gastrointestinal anastomosis
- Delayed gastric emptying
- Delayed gastric emptying following procedure
- Diarrhea after gastrointestinal tract surgery
- Diarrhea and vomiting after gastrointestinal tract surgery
- Disorder of anastomosis of biliary tract
- Disorder of gastrointestinal anastomosis
- Disorder of pancreatic duct anastomosis
- Duodenal anastomotic dehiscence
- Duodenal anastomotic leak
- Duodenal stump leak
- Erosion of gastrointestinal anastomosis
- Esophageal anastomotic leak
- Esophageal anastomotic necrosis
- Esophageal anastomotic stricture
- Failed laparoscopic cholecystectomy
- Failed pancreatogram
- Fontan-associated liver disease
- Foreign body granuloma of intestine
- Gastric anastomotic stricture
- Gastric retention
- Gastrointestinal anastomotic dehiscence
- Gastrointestinal anastomotic leak
- Gastrointestinal anastomotic necrosis
- Gastrointestinal anastomotic tumor recurrence
- Gastrointestinal anastomotic ulcer due to Crohn disease
- Gastrointestinal complication of procedure
- Gastrointestinal complications of care
- Generalized enamel hypoplasia associated with radiation therapy
- Granuloma of intestine
- Injury of salivary apparatus
- Injury of salivary gland
- Large intestine anastomotic dehiscence
- Leakage from pyloroplasty
- Leakage of bile
- Leakage of bile from choledochotomy
- Low anterior resection syndrome
- Megaloblastic anemia due to gastrectomy
- Nasogastric tube esophagitis
- Pancreatic duct anastomotic stricture
- Peptic anastomotic ulcer
- Peripheral nerve disorder associated with repair of hernia
- Phytobezoar
- Polypectomy scar of large intestine
- Post polypectomy syndrome
- Post-cholecystectomy bile leakage
- Postcholecystectomy bile peritonitis
- Post-ERCP acute pancreatitis
- Postgastrectomy gastritis
- Postgastrectomy phytobezoar
- Postoperative acute pancreatitis
- Postoperative biliary stricture
- Postoperative esophagitis
- Postoperative gastric retention
- Postoperative peritonitis
- Postoperative stricture
- Postoperative vomiting
- Postprocedural bile duct leakage
- Post-vagotomy dysphagia
- Rectal stump blowout
- Rectal stump leak
- Salivary dysfunction caries following radiotherapy
- Salivary dysfunction dental caries
- Secondary dental caries associated with local or systemic factors
- Small intestine anastomotic dehiscence
- Small intestine anastomotic leak
- Stenosis of bile duct
- Stenosis of jejunum
- Stenosis of rectum
- Stenosis of stoma
- Stricture of anastomosis of gastrointestinal tract
- Stricture of anastomosis of intestine
- Stricture of bile duct
- Stricture of biliary-enteric anastomosis
- Stricture of hepatic duct
- Stricture of hepaticojejunal anastomosis
- Stricture of jejunum
- Stricture of rectum
- Stricture of rectum due to radiation
- Stricture of small intestine
- Suture granuloma of intestine
- Vomiting after gastrointestinal tract surgery
- Xerostomia
- Xerostomia caused by ionizing radiation
- Xerostomia following radiotherapy
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Use Additional Code
- code, if applicable, to further specify disorder
Type 2 Excludes
- postprocedural retroperitoneal abscess K68.11
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- intestinal - K63.89
- complicated NEC - K91.89
- Complication (s) (from) (of)
- anastomosis (and bypass) - See Also: Complications, prosthetic device or implant;
- intestinal (internal) NEC - K91.89
- specified NEC - K91.89
- postprocedural - See Also: Complications, surgical procedure;
- digestive - K91.89
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) - R19.7
- functional - K59.1
- following gastrointestinal surgery - K91.89
- Disorder (of) - See Also: Disease;
- functional NEC - K59.9
- postoperative - K91.89
- Ileus (bowel) (colon) (inhibitory) (intestine) - K56.7
- postoperative - K91.89
- Parotitis, parotiditis (allergic) (nonspecific toxic) (purulent) (septic) (suppurative) - See Also: Sialoadenitis;
- postoperative - K91.89
- surgical - K91.89
- Stricture - See Also: Stenosis;
- bile duct (common) (hepatic) - K83.1
- postoperative - K91.89
- due to
- irradiation - K91.89
- Syndrome - See Also: Disease;
- afferent loop NEC - K91.89
- gastrojejunal loop obstruction - K91.89
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Anastomosis
- intestinal
- complicated NEC
- Complication(s) (from) (of)
- anastomosis (and bypass)
- intestinal (internal) NEC
- Complication(s) (from) (of)
- gastrointestinal
- postoperative
- specified NEC
- Complication(s) (from) (of)
- postprocedural
- specified NEC
- digestive
- Diarrhea, diarrheal(disease) (infantile) (inflammatory)
- functional
- following gastrointestinal surgery
- Difficult, difficulty(in)
- mechanical, gastroduodenal stoma
- Disorder(of)
- intestine, intestinal
- functional NEC
- postoperative
- Ileus(bowel) (colon) (inhibitory) (intestine)
- postoperative
- Parotitis, parotiditis(allergic)(nonspecific toxic) (purulent) (septic) (suppurative)
- postoperative
- Parotitis, parotiditis(allergic)(nonspecific toxic) (purulent) (septic) (suppurative)
- surgical
- Stricture
- bile duct (common) (hepatic)
- postoperative
- Stricture
- rectum (sphincter)
- due to
- irradiation
- Syndrome
- afferent loop NEC
- Syndrome
- gastrojejunal loop obstruction
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Low Anterior Resection Syndrome
postoperative complication after removal of the rectum (low anterior resection surgery or resection surgery to the lower part of the colon). it includes disordered rectum function, e.g., frequent bowel movement; fecal incontinence; and constipation.Xerostomia
decreased salivary flow.Bile Duct Leakage
the leakage of bile into the abdominal cavity as a result of injury to the bile duct.Esophageal Anastomotic Stricture
luminal narrowing at the site of surgical resection and reconstruction of the esophagus.Recurrent Esophageal Anastomotic Stricture
recurrence of an esophageal anastomotic stricture following therapeutic dilation.Refractory Esophageal Anastomotic Stricture
esophageal anastomotic stricture that remains narrowed despite repeated therapeutic dilations.Low Anterior Resection Syndrome
a collection of symptoms following removal of part or all of the rectum that may include frequency or urgency of stools, numerous bowel movements over a few hours, fecal incontinence, constipation alternating with numerous bowel movements, and/or increased intestinal gas.
Patient EducationClinical
After Surgery
After any operation, you'll have some side effects. There is usually some pain with surgery. There may also be swelling and soreness around the area that the surgeon cut. Your surgeon can tell you which side effects to expect.
Read the full article at MedlinePlus
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Convert K91.89 to ICD-9-CMHistory
Code HistoryHistory
Questions About K91.89Overview
Is K91.89 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other postprocedural complications and disorders of digestive system on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K91.89 group to?
When other postprocedural complications and disorders of digestive system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of K91.89?
Under the General Equivalence Mappings, other postprocedural complications and disorders of digestive system converts to ICD-9-CM 564.4 (postop GI funct dis NEC) and 997.49 (oth digestv system comp). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
