K35.33
K35.33: Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
Billable / specific codeICD-10-CM
K35.33 is a billable, specific ICD-10-CM code for acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess. It is valid for submission on a claim.
Check K35.33 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- (Acute) appendicitis with (peritoneal) abscess NOS
- Ruptured appendix with localized peritonitis and abscess
Other codes that can never be billed with K35.33
Their own Excludes1 notes name this code, so the conflict is not listed above.
- K65Peritonitis
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
K35.33 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A55336Billing and Coding: Retroperitoneal Ultrasound
- A56421Billing and Coding: CT of the Abdomen and Pelvis
Alphabetic index entries that lead here
- Abscess›appendix
- Abscess›cecum
- Abscess›ileocecal
- Abscess›periappendicular
- Abscess›pericecal
- Abscess›perityphlic
- Abscess›postcecal
- Abscess›subcecal
- Abscess›vermiform appendix
- Abscess›iliac›fossa
- Abscess›peritoneum, peritoneal›with appendicitis
- Appendicitis›with›peritoneal abscess
Code history
Unchanged in every release from FY2024 to FY2027.