K52.89

Other specified noninfective gastroenteritis and colitis

K52.89 is a diagnostic classification for noninfectious inflammatory conditions of the gastrointestinal tract that are clinically specified but do not fall into other discrete categories such as eosinophilic, microscopic, radiation-induced, or toxic gastroenteritis. This code is frequently utilized for conditions like diversion colitis, which occurs in a bypassed segment of the colon following surgical procedures like a colostomy or ileostomy due to the absence of short-chain fatty acids. It also encompasses chemical colitis resulting from exposure to irritants (such as certain medications or cleansing agents) and other rare, identified forms of noninfective inflammation of the gastric and intestinal mucosa. Clinical focus is typically on the identification and removal of the specific causative agent or the restoration of bowel continuity in the case of diversion-related disease.

Clinical Symptoms

  • Chronic or acute watery diarrhea
  • Abdominal pain and cramping
  • Mucus discharge per rectum
  • Tenesmus (urgent but unproductive urge to defecate)
  • Occasional hematochezia or rectal bleeding
  • Abdominal bloating and distension
  • Weight loss in prolonged cases
  • Fecal incontinence
  • Low-grade fever during acute flares

Common Causes

  • Diversion of the fecal stream (Diversion colitis)
  • Chemical irritation (e.g., glutaraldehyde, soap enemas, or specific medications)
  • NSAID-induced enteropathy and colonic inflammation
  • Post-surgical inflammatory changes not elsewhere classified
  • Chronic mucosal irritation from unspecified non-pathogenic sources
  • Idiopathic specific gastrointestinal inflammatory syndromes

Documentation & Coding Tips

Distinguish between specified and unspecified noninfective conditions by identifying the causative agent or the specific pathological diagnosis that does not fall into other K52 subcategories.

Example: Patient presents with persistent watery diarrhea and abdominal cramping. Endoscopy and biopsy confirm microscopic colitis, specifically characterized as diversion colitis following a previous surgical procedure, which is not elsewhere classified. Etiology is noninfectious, and symptoms have persisted for three months. Current management includes budesonide 9mg daily for symptom control.

Billing Focus: Documentation identifies the specific type of colitis as diversion colitis, which necessitates the use of K52.89 over more general codes like K52.9.

Explicitly document the exclusion of infectious etiologies such as Clostridioides difficile or viral pathogens to justify the use of a noninfective code.

Example: The patient exhibits chronic diarrhea. Stool cultures, PCR for C. difficile, and ova/parasite exams are all negative. Clinical picture and history of recent chemotherapy with fluorouracil suggest a drug-induced noninfective colitis. Patient is experiencing grade 2 toxicity with 4 to 6 stools per day over baseline.

Billing Focus: Documentation of negative infectious results validates the selection of a noninfective code from the K52 series.

Provide clear documentation of the histopathological findings if a biopsy was performed, as this often defines the specified nature of the colitis.

Example: Colonoscopy with biopsy of the descending colon reveals mild architectural distortion and increased intraepithelial lymphocytes not meeting the full criteria for lymphocytic colitis, but consistent with a specified noninfective microscopic inflammatory process. Symptoms include nocturnal diarrhea and fecal urgency.

Billing Focus: Laterality and site specificity of the biopsy (descending colon) support the associated CPT code 45380 for biopsy.

When the colitis is secondary to a systemic condition or external agent, such as radiation or chemical exposure, link the condition directly to the cause.

Example: Patient with a history of pelvic radiation for prostate cancer now presents with hematochezia and tenesmus. Sigmoidoscopy shows friable mucosa consistent with radiation-induced proctocolitis. This specified noninfective condition is currently managed with sucralfate enemas.

Billing Focus: Linking the condition to radiation exposure requires the additional external cause code (e.g., Y84.2), supporting the complexity of the diagnosis.

Document the acuity of the presentation, whether it is an acute flare of a specified chronic condition or a new-onset specified gastroenteritis.

Example: Acute exacerbation of chronic specified noninfective gastroenteritis. Patient reports a sudden increase in stool frequency (8 episodes/day) and signs of mild dehydration. The patient has a known history of lymphocytic-type changes that have progressed. IV fluids initiated in the office.

Billing Focus: Documenting the acute flare supports a higher level of Medical Decision Making (MDM) due to the risk of morbidity.

Relevant CPT Codes

Related Diagnoses

Hierarchy