Unspecified acute appendicitis

This code signifies an acute inflammation of the appendix where the specific type of appendicitis (e.g., with perforation, abscess, or peritonitis) has not been documented by the provider. It indicates a sudden onset of appendiceal inflammation without further clinical detail regarding complications.

Use this code when the medical record clearly states a diagnosis of "acute appendicitis" but lacks further specificity regarding perforation, abscess formation, or generalized peritonitis. This code is appropriate when the physician's documentation does not provide enough information to assign a more specific code within the K35 series.

• Avoid using this code if the documentation provides details of perforation, abscess, or peritonitis; instead, select a more specific code from K35.0-K35.1.
• Query the provider for additional specificity if the documentation only states "acute appendicitis" to determine if a more precise code can be assigned.
• This code is often used in emergency department settings or initial presentations before definitive diagnostic imaging or surgical findings are available.