K35: Acute appendicitis

K35.3: Acute appendicitis with localized peritonitis

Acute appendicitis with localized peritonitis, as classified by the ICD-10 K35.3, refers to an inflammation of the appendix, a small tube-like structure at the lower end of the large intestine, coupled with an infection that has spread to the lining of the abdomen, known as the peritoneum. This condition typically begins with a blockage in the appendix from either a buildup of fecal matter or a foreign body, leading to bacterial growth that causes inflammation and eventually ruptures the appendix. Localized peritonitis, which is the infection of the peritoneum, escalates from the rupture and typically presents in nearby tissues. Common symptoms often include pain in the lower right abdomen, loss of appetite, nausea, and fever. It's important to note that cases can progress rapidly, from initial discomfort to a severe and potentially life-threatening condition within a matter of hours to days.