K35.3 vs K63.0
K35.3 (Acute appendicitis with localized peritonitis) compared with K63.0 (Abscess of intestine), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. K63.0 carries an Excludes2 note covering K35.3: “abscess of appendix (K35.3-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| K35.3Acute appendicitis with localized peritonitis | K63.0Abscess of intestine | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Acute appendicitis with localized peritonitis is a non-billable ICD-10-CM category code (K35.3). | Abscess of intestine is a billable ICD-10-CM diagnosis code (K63.0). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources