ICD-10-CM category
K35: Acute appendicitis
Codes under K35 (Acute appendicitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K35.2 | Acute appendicitis with generalized peritonitis | — |
| K35.3 | Acute appendicitis with localized peritonitis | — |
| K35.8 | Other and unspecified acute appendicitis | — |
| K35.20 | Acute appendicitis with generalized peritonitis, without abscess | — |
| K35.21 | Acute appendicitis with generalized peritonitis, with abscess | — |
| K35.30 | Acute appendicitis with localized peritonitis, without perforation or gangrene | ✓ |
| K35.31 | Acute appendicitis with localized peritonitis and gangrene, without perforation | ✓ |
| K35.32 | Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess | ✓ |
| K35.33 | Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess | ✓ |
| K35.80 | Unspecified acute appendicitis | ✓ |
| K35.89 | Other acute appendicitis | — |
| K35.200 | Acute appendicitis with generalized peritonitis, without perforation or abscess | ✓ |
| K35.201 | Acute appendicitis with generalized peritonitis, with perforation, without abscess | ✓ |
| K35.209 | Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation | ✓ |
| K35.210 | Acute appendicitis with generalized peritonitis, without perforation, with abscess | ✓ |
| K35.211 | Acute appendicitis with generalized peritonitis, with perforation and abscess | ✓ |
| K35.219 | Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation | ✓ |
| K35.890 | Other acute appendicitis without perforation or gangrene | ✓ |
| K35.891 | Other acute appendicitis without perforation, with gangrene | ✓ |
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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