ICD-10-CM Billable Code

K35.3

Acute appendicitis with localized peritonitis

Clinical Classification Guidelines

Medical Intelligence & Overview

Acute appendicitis with localized peritonitis is a condition characterized by inflammation of the appendix, which can lead to localized infection and irritation of the surrounding abdominal lining. This condition often requires prompt medical attention to prevent complications such as widespread infection or rupture. Recognizing the signs and understanding the causes can help in early diagnosis and treatment.

Causes & Symptoms

Clinical Causes: Blockage of the appendix lumen by fecaliths (hardened stool), foreign bodies, or lymphoid hyperplasia. Infection caused by bacteria or viruses that invade the appendix wall. Obstruction due to tumors or thickened lymphoid tissue. Structural anomalies of the appendix or surrounding organs that impair normal drainage. Genetic predisposition leading to weaker immune response.

Key Symptoms: Sudden onset of abdominal pain, often starting around the navel and migrating to the lower right abdomen. Tenderness in the right lower quadrant of the abdomen. Loss of appetite (anorexia). Nausea and vomiting. Low-grade fever and chills. Localized tenderness and resistance in the affected area. Possible swelling or a palpable mass in the lower abdomen. Elevated white blood cell count indicating infection.

Diagnostic & Treatment

Diagnosis Path: Physical examination revealing tenderness, rebound pain, and guarding in the lower right abdomen. Laboratory tests showing increased white blood cell count and possible signs of infection. Imaging studies such as ultrasound or computed tomography (CT) scan to visualize the inflamed appendix and surrounding tissues. Assessment of symptoms and medical history to rule out other abdominal conditions. In some cases, diagnostic laparoscopy may be performed for direct visual examination.

Treatment Protocols: Surgical removal of the inflamed appendix, known as an appendectomy, is often the definitive treatment. Antibiotic therapy to control infection and reduce inflammation, especially prior to surgery. Pain management with analgesics to alleviate discomfort. Monitoring for signs of complication or progression to more widespread peritonitis. Postoperative care including wound care 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 K35.3 a billable ICD-10 code?
Yes, K35.3 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.

Documentation

How do I report K35.3?
Clinical documentation must specify the nature of Acute appendicitis with localized peritonitis and any associated comorbidities for accurate reporting.

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