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K58.9 – Irritable Bowel Syndrome, Unspecified

K58.9 is the ICD-10 code for irritable bowel syndrome, unspecified. It describes a functional bowel disorder with abdominal pain and altered bowel habits without an organic cause.

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Things worth knowing about "K58.9"

K58.9 is the ICD-10 code for irritable bowel syndrome, unspecified. It describes a functional bowel disorder with abdominal pain and altered bowel habits without an organic cause.

What Does the ICD-10 Code K58.9 Mean?

The ICD-10 code K58.9 stands for Irritable Bowel Syndrome (IBS), unspecified. It belongs to the group of functional bowel disorders and is used when a diagnosis of IBS has been established but no further subtype classification – such as IBS with diarrhea or IBS with constipation – has been documented.

What Is Irritable Bowel Syndrome?

Irritable Bowel Syndrome (IBS) is a common, chronic condition of the gastrointestinal tract. It is characterized by impaired bowel function in the absence of detectable organic changes such as inflammation or tumors. The condition can significantly affect the quality of life of those affected.

Causes

The exact causes of IBS are not yet fully understood. A combination of several factors is believed to be involved:

Altered gut-brain communication: Disrupted signaling between the gut and the brain (the gut-brain axis) plays a central role.
Altered gut motility: The bowel reacts with increased sensitivity to stimuli such as food, stress, or gas.
Changes in the gut microbiome: An imbalance in the intestinal flora may contribute to the development of IBS.
Psychosocial factors: Stress, anxiety, and depression are closely associated with IBS.
Post-infectious IBS: IBS can develop following a gastrointestinal infection.

Symptoms

Symptoms can vary widely between individuals and may include:

Recurrent abdominal pain or cramping
Bloating and a feeling of abdominal distension
Altered bowel habits: diarrhea, constipation, or alternating between both
Feeling of incomplete bowel evacuation
Mucus in the stool

Symptoms often improve after a bowel movement and may be triggered or worsened by stress or certain foods.

Diagnosis

IBS is diagnosed according to the Rome IV criteria: recurrent abdominal pain on at least one day per week over the last three months, associated with two or more of the following: related to defecation, associated with a change in stool frequency, or associated with a change in stool consistency.

As IBS is a diagnosis of exclusion, organic conditions must first be ruled out through:

Blood tests (inflammatory markers, celiac antibodies)
Stool tests
Colonoscopy if indicated
Abdominal ultrasound

Treatment

There is currently no cure for IBS, but symptoms can be effectively managed. Treatment is individualized and includes several approaches:

Dietary Adjustments

Identification and avoidance of trigger foods
Low-FODMAP diet: reducing fermentable carbohydrates
Regular meals and adequate fluid intake

Medication

Antispasmodics (e.g., hyoscine butylbromide) for abdominal cramps
Laxatives for constipation or antidiarrheals for diarrhea
Probiotics to support the gut microbiome
Low-dose antidepressants for severe symptoms

Psychological and Complementary Therapies

Stress management and relaxation techniques
Cognitive behavioral therapy (CBT)
Gut-directed hypnotherapy

References

Lacy BE et al. - Bowel Disorders. Gastroenterology. 2016;150(6):1393-1407. (Rome IV Criteria)
World Health Organization - ICD-10 Version 2019, Chapter XI: K58 Irritable Bowel Syndrome.
Ford AC et al. - Irritable bowel syndrome. The Lancet. 2020;396(10263):1675-1688.

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