ICD-10-CM Billable Code

K35.2

Acute appendicitis with generalized peritonitis

Clinical Classification Guidelines

Medical Intelligence & Overview

Acute appendicitis with generalized peritonitis is a severe medical condition characterized by inflammation of the appendix accompanied by widespread infection of the abdominal cavity's lining. This condition requires prompt medical attention as it can lead to life-threatening complications. Recognized under the ICD-10 code K35.2, it is important to understand its causes, symptoms, diagnosis, and treatment options to facilitate timely healthcare intervention.

Causes & Symptoms

Clinical Causes: Obstruction of the appendix opening, often due to a fecalith (hardened stool), foreign body, or lymphoid tissue swelling. Bacterial infection that invades the appendix wall following obstruction, causing inflammation. Spread of infection from neighboring abdominal organs or tissues. Rarely, trauma or injury to the abdomen triggering inflammation.

Key Symptoms: Sudden onset of abdominal pain, typically starting near the umbilicus and then shifting to the lower right quadrant. Pain that worsens with movement, coughing, or deep breathing. Fever and chills indicating systemic infection. Nausea and vomiting. Loss of appetite. Abdominal tenderness and rigidity. Signs of shock in severe cases, such as rapid heartbeat, low blood pressure, and dizziness.

Diagnostic & Treatment

Diagnosis Path: Complete blood count (CBC) to identify elevated white blood cell counts indicative of infection. Abdominal ultrasound to visualize the appendix and detect fluid collections or signs of perforation. Computed tomography (CT) scan, which offers detailed imaging to identify inflammation, perforation, or generalized peritonitis. Abdominal X-rays may be used to rule out other causes of abdominal pain or detect free air from a perforation.

Treatment Protocols: Emergency appendectomy, usually performed laparoscopically or through open surgery, to remove the inflamed appendix. Broad-spectrum antibiotics administered before and after surgery to combat infection and prevent further spread. Intravenous fluids to stabilize the patient, maintain hydration, and correct electrolyte imbalances. In severe cases with extensive infection or perforation, additional procedures may be necessary to clean the abdominal cavity and drain abscesses. Postoperative care includes monitoring for signs of ongoing infection or complications, pain management, and gradual return to normal activities.

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

Clinical Advice & FAQs

Billing Guidance

Is K35.2 a billable ICD-10 code?
Yes, K35.2 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.

Documentation

How do I report K35.2?
Clinical documentation must specify the nature of Acute appendicitis with generalized peritonitis and any associated comorbidities for accurate reporting.

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