| K35 | Acute appendicitis |
| K35.2 | Acute appendicitis with generalized peritonitis |
| K35.3 | Acute appendicitis with localized peritonitis |
| K35.8 | Other and unspecified acute appendicitis |
| K35.80 | Unspecified acute appendicitis |
| K35.89 | Other acute appendicitis |
| K36 | Other appendicitis |
| K37 | Unspecified appendicitis |
| K38 | Other diseases of appendix |
| K38.0 | Hyperplasia of appendix |
| K38.1 | Appendicular concretions |
| K38.2 | Diverticulum of appendix |
| K38.3 | Fistula of appendix |
| K38.8 | Other specified diseases of appendix |
| K38.9 | Disease of appendix, unspecified |