Acute appendicitis

Sudden illness and injury. Also called: Appendicitis.

How common is Acute appendicitis in the US?

Adult hospitalizations for uncomplicated appendicitis (UA), identified by ICD-10-CM codes: 167,125 (Adult hospitalizations for uncomplicated appendicitis, United States, National (Nationwide) Inpatient Sample, 2018-2019 (count over 2 years, not an annual rate); United States (National Inpatient Sample, nationally representative hospital sample), 2018-2019). Source: The Journal of surgical research, 2024. Label: REPORTED.

• 167,125 Adult hospitalizations for uncomplicated appendicitis (UA), identified by ICD-10-CM codes. Out of: Adult hospitalizations for uncomplicated appendicitis, United States, National (Nationwide) Inpatient Sample, 2018-2019 (count over 2 years, not an annual rate). Where: United States (National Inpatient Sample, nationally representative hospital sample). When: 2018-2019. Adult, uncomplicated appendicitis hospitalizations only; excludes complicated appendicitis and pediatric cases, and non-hospitalized cases. Label: REPORTED.

  Among the 167,125 patients with UA, 137,644 (82.4%) underwent operative management and 29,481 (17.6%) underwent NOM.

  Source: Management of Uncomplicated Appendicitis in Adults: A Nationwide Analysis From 2018 to 2019. The Journal of surgical research, 2024. PubMed 38640616. DOI 10.1016/j.jss.2024.03.017.

Each figure measures something different. Do not compare them with each other or with other conditions.

Medical codes

• ICD-10-CM FY2026: K35.80 Unspecified acute appendicitis (narrower). Other codes in this category also apply.

Research activity

As of 2026-09-24: 428 registered studies on ClinicalTrials.gov (search Acute Appendicitis) and 3,259 PubMed records, 2021 to 2025. A count of records is not how common or serious the condition is.

Population information, not medical advice. Methodology · Known limitations