2026 ICD-10-CM Diagnosis Code K59.89Other specified functional intestinal disorders
ICD-10-CM Codes›K00–K95›K55-K64›K59
- Billable — Valid for Submission
- Not Chronic
K59.89 is a billable ICD-10-CM diagnosis code for other specified functional intestinal disorders. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormal large bowel motility
- Abnormal small intestine secretion
- Absence of peristalsis of intestine
- Acute intestinal pseudo-obstruction
- Acute pseudo-obstruction of small intestine
- Anal sphincter tone - finding
- Appearance of anal orifice - finding
- Atony of colon
- Chronic atrial and intestinal dysrhythmia
- Chronic idiopathic intestinal pseudo-obstruction
- Chronic intestinal pseudo-obstruction
- Chronic pseudo-obstruction of colon
- Chronic pseudo-obstruction of small intestine
- Dilatation of cecum
- Dilatation of intestine
- Dysmotility of small intestine caused by drug
- Dysmotility of small intestine due to systemic disease
- Finding of appearance of anus
- Hepatic flexure syndrome
- Hollow visceral neuropathy
- Hyperactive rectosigmoid junction
- Impaired intestinal epithelial cell digestion
- Impaired intestinal epithelial cell transport
- Impaired intestinal epithelial cell transport of amino acids
- Impaired intestinal epithelial cell transport of carbohydrates
- Impaired intestinal epithelial cell transport of fats
- Impaired intestinal lymphatic transport of nutrients
- Intestinal hurry
- Irregularly dilated anal orifice
- Megaduodenum
- Motility disorder of intestine
- Motility disorder of large intestine
- Motility disorder of small intestine
- Neuronal intestinal pseudo-obstruction
- Payr's syndrome
- Primary chronic pseudo-obstruction of gastrointestinal tract
- Primary chronic pseudo-obstruction of large intestine
- Primary chronic pseudo-obstruction of small intestine
- Primary desmosis coli
- Pseudodiarrhea
- Pseudo-obstruction of gastrointestinal tract
- Pseudo-obstruction of intestine
- Reflex dilation of anus
- Secondary intestinal pseudo-obstruction
- Sick sinus syndrome
- Small intestinal stasis syndrome
- Toxic dilatation of intestine
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Atony of colon
- Pseudo-obstruction (acute) (chronic) of intestine
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Achalasia (cardia) (esophagus) - K22.0
- sphincteral NEC - K59.89
- Contraction (s), contracture, contracted
- anus - K59.89
- rectum, rectal (sphincter) - K59.89
- Disease, diseased - See Also: Syndrome;
- functional - K59.9
- specified NEC - K59.89
- Dyskinesia - G24.9
- intestinal - K59.89
- intestinal - K59.89
- intestinal - K59.89
- intestine - K59.89
- Ileus (bowel) (colon) (inhibitory) (intestine) - K56.7
- myxedema - K59.89
- intestine - K59.89
- Pseudo-obstruction intestine (acute) (chronic) (idiopathic) (intermittent secondary) (primary) - K59.89
- Spasm (s), spastic, spasticity - See Also: condition; - R25.2
- duodenum - K59.89
- Stasis
- cecum - K59.89
- colon - K59.89
- ileocecal coil - K59.89
- ileum - K59.89
- intestinal - K59.89
- jejunum - K59.89
- rectal - K59.89
- Syndrome - See Also: Disease;
- hepatic flexure - K59.89
- König's - K59.89
- splenic
- flexure - K59.89
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Achalasia(cardia) (esophagus)
- sphincteral NEC
- Atonia, atony, atonic
- cecum
- Atonia, atony, atonic
- intestine
- Contraction(s), contracture, contracted
- anus
- Contraction(s), contracture, contracted
- rectum, rectal (sphincter)
- Dilatation
- anus
- Dilatation
- duodenum
- Dilatation
- ileum
- Dilatation
- jejunum
- Disease, diseased
- intestine
- functional
- specified NEC
- Dyskinesia
- intestinal
- Dyspepsia
- intestinal
- Hyperemia(acute) (passive)
- enteric
- Hyperemia(acute) (passive)
- intestine
- Hypofunction
- intestinal
- Hypomotility
- intestine
- Ileus(bowel) (colon) (inhibitory) (intestine)
- myxedema
- Immobile, immobility
- intestine
- Irritable, irritability
- duodenum
- Irritable, irritability
- ileum
- Irritable, irritability
- jejunum
- Irritable, irritability
- rectum
- Paralysis, paralytic(complete) (incomplete)
- digestive organs NEC
- Pseudo-obstruction intestine(acute) (chronic) (idiopathic) (intermittent secondary) (primary)
- Spasm(s), spastic, spasticity
- duodenum
- Stasis
- cecum
- Stasis
- colon
- Stasis
- ileocecal coil
- Stasis
- ileum
- Stasis
- intestinal
- Stasis
- jejunum
- Stasis
- rectal
- Syndrome
- hepatic flexure
- Syndrome
- König's
- Syndrome
- splenic
- flexure
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Sick Sinus Syndrome
a condition caused by dysfunctions related to the sinoatrial node including impulse generation (cardiac sinus arrest) and impulse conduction (sinoatrial exit block). it is characterized by persistent bradycardia, chronic atrial fibrillation, and failure to resume sinus rhythm following cardioversion. this syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
Patient EducationClinical
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.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement K59.89 replaces the following previously assigned code(s):
- K59.8 - Other specified functional intestinal disorders
Questions About K59.89Overview
Is K59.89 (Other specified functional intestinal disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified functional intestinal disorders on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K59.89 group to?
When other specified functional intestinal disorders is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
