| K35 | Acute appendicitis | NON-BILLABLE CODE |
| K35.2 | Acute appendicitis with generalized peritonitis | NON-BILLABLE CODE |
| K35.20 | Acute appendicitis with generalized peritonitis, without abscess | NON-BILLABLE CODE |
| K35.200 | Acute appendicitis with generalized peritonitis, without perforation or abscess | BILLABLE CODE |
| K35.201 | Acute appendicitis with generalized peritonitis, with perforation, without abscess | BILLABLE CODE |
| K35.209 | Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation | BILLABLE CODE |
| K35.21 | Acute appendicitis with generalized peritonitis, with abscess | NON-BILLABLE CODE |
| K35.210 | Acute appendicitis with generalized peritonitis, without perforation, with abscess | BILLABLE CODE |
| K35.211 | Acute appendicitis with generalized peritonitis, with perforation and abscess | BILLABLE CODE |
| K35.219 | Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation | BILLABLE CODE |
| K35.3 | Acute appendicitis with localized peritonitis | NON-BILLABLE CODE |
| K35.30 | Acute appendicitis with localized peritonitis, without perforation or gangrene | BILLABLE CODE |
| K35.31 | Acute appendicitis with localized peritonitis and gangrene, without perforation | BILLABLE CODE |
| K35.32 | Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess | BILLABLE CODE |
| K35.33 | Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess | BILLABLE CODE |
| K35.8 | Other and unspecified acute appendicitis | NON-BILLABLE CODE |
| K35.89 | Other acute appendicitis | NON-BILLABLE CODE |
| K35.890 | Other acute appendicitis without perforation or gangrene | BILLABLE CODE |
| K35.891 | Other acute appendicitis without perforation, with gangrene | BILLABLE CODE |
