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K51.3 Ulcerative Rectosigmoiditis – ICD-10
K51.3 is the ICD-10 code for ulcerative rectosigmoiditis, a chronic inflammatory bowel disease affecting the rectum and sigmoid colon.
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K51.3 is the ICD-10 code for ulcerative rectosigmoiditis, a chronic inflammatory bowel disease affecting the rectum and sigmoid colon.
What is K51.3 – Ulcerative Rectosigmoiditis?
The ICD-10 code K51.3 refers to ulcerative rectosigmoiditis, a subtype of ulcerative colitis – a chronic inflammatory bowel disease. In this condition, inflammation is limited to the rectum and the sigmoid colon (the last segment of the large intestine before the rectum). The lining of these bowel segments becomes inflamed and typically develops ulcers (open sores).
Causes
The exact cause of ulcerative rectosigmoiditis is not fully understood. Key contributing factors include:
- Abnormal immune response: The immune system mistakenly attacks the lining of the bowel.
- Genetic predisposition: A family history of inflammatory bowel disease increases the risk.
- Gut microbiome imbalance: Disruption of the intestinal flora can promote inflammation.
- Environmental and lifestyle factors: Stress, diet, and certain medications may act as triggers.
Symptoms
Symptoms typically occur in flares and vary in severity:
- Bloody or mucus-containing stools
- Frequent and urgent need to defecate (tenesmus)
- Abdominal pain and cramps, particularly in the lower left abdomen
- Diarrhea or altered bowel habits
- General malaise and fatigue
- In severe cases: weight loss and anemia
Diagnosis
Diagnosis is established through a combination of investigations:
- Colonoscopy: The gold standard for direct visualization of the bowel lining and collection of tissue samples (biopsies).
- Histological examination: Microscopic analysis of biopsy tissue to confirm the diagnosis.
- Blood tests: Inflammatory markers such as CRP and a full blood count to assess disease activity.
- Stool tests: To exclude infectious causes; fecal calprotectin is used as an inflammatory marker.
Treatment
Treatment depends on the severity of the flare and is aimed at achieving and maintaining remission:
Medical Treatment
- Aminosalicylates (5-ASA): First-line therapy, e.g., mesalazine, administered locally as suppositories or enemas, and/or orally.
- Corticosteroids: Used in moderate to severe flares to reduce inflammation.
- Immunomodulators: e.g., azathioprine for patients with frequent relapses.
- Biologics: e.g., TNF-alpha inhibitors in refractory cases.
Surgical Treatment
Surgery (e.g., proctocolectomy) may be necessary in cases of serious complications or failure of medical therapy.
Lifestyle and Supportive Measures
- Stress reduction and psychosocial support
- Dietary adjustments during active flares
- Regular medical follow-up appointments
Course and Prognosis
Ulcerative rectosigmoiditis typically follows a relapsing-remitting course. With consistent medical treatment, long-term remission can be achieved in most patients. In some individuals, the inflammation may extend to other parts of the colon over time. Long-term complications, such as an increased risk of colorectal cancer after many years of disease, require regular surveillance colonoscopies.
References
- German Society for Gastroenterology, Digestive and Metabolic Diseases (DGVS): S3 Guideline Ulcerative Colitis, 2023.
- World Health Organization (WHO): ICD-10 Classification – K51.3 Ulcerative (chronic) rectosigmoiditis, 2019.
- Dignass A et al.: Second European evidence-based consensus on the diagnosis and management of ulcerative colitis. Journal of Crohn's and Colitis, 2012.
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