ICD-10-CM Billable Code

K35.33

Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess

Clinical Classification Guidelines

Inclusion Terms

  • (Acute) appendicitis with (peritoneal) abscess NOS
  • Ruptured appendix with localized peritonitis and abscess

Medical Intelligence & Overview

ICD-10 code K35.33 describes a severe form of appendicitis where the inflamed appendix has perforated, leading to localized peritonitis and the formation of an abscess. This condition requires prompt recognition and treatment to prevent further complications. It is considered a serious medical emergency due to the potential for widespread infection and tissue damage.

Causes & Symptoms

Clinical Causes: Obstruction of the appendix opening due to fecalith, lymphoid hyperplasia, or foreign bodies. Infection leading to inflammation and swelling of the appendix. Delayed diagnosis or treatment of initial appendicitis, allowing it to progress to perforation. Anatomical anomalies or immune deficiencies that may predispose to severe inflammation. Other factors like age, where the immune response may alter the course of inflammation.

Key Symptoms: Sudden onset of severe abdominal pain, often starting near the navel and migrating to the right lower abdomen. Tenderness in the right lower quadrant of the abdomen. Nausea and vomiting. Loss of appetite. Fever and chills indicating infection. Possible abdominal rigidity or guarding due to irritation of the peritoneum. Signs of localized abscess formation such as swelling or palpable mass if the abscess is superficial.

Diagnostic & Treatment

Diagnosis Path: Physical examination revealing abdominal tenderness, rebound pain, and guarding. Blood tests showing elevated white blood cell count (leukocytosis), indicating infection. Imaging studies such as ultrasound or computed tomography (CT) scan to visualize the perforated appendix, abscess, and localized peritonitis. Additional tests like abdominal X-rays might reveal signs of perforation or abscess formation.

Treatment Protocols: Hospitalization for close monitoring and supportive care. Drainage of abscesses, often performed through procedures like percutaneous abscess drainage guided by imaging. Surgical intervention, usually an emergency appendectomy, to remove the diseased appendix. Antibiotic therapy tailored to cover common pathogens involved in abdominal infections. Postoperative care including pain management, wound care, and monitoring for signs of recurrent infection or complications. In some cases, initial conservative management with antibiotics and drainage may be considered if surgery poses high risks, but definitive removal remains essential.

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 K35.33 a billable ICD-10 code?
Yes, K35.33 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.

Documentation

How do I report K35.33?
Clinical documentation must specify the nature of Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess and any associated comorbidities for accurate reporting.

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Clinical Meta Tags

acute appendicitis localized abscess