K35.80
K35.80: Unspecified acute appendicitis
Billable / specific codeICD-10-CM
K35.80 is a billable, specific ICD-10-CM code for unspecified acute appendicitis. It is valid for submission on a claim.
Check K35.80 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Acute appendicitis NOS
- Acute appendicitis without (localized) (generalized) peritonitis
Other codes that can never be billed with K35.80
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
K35.80 is named in 3 Medicare coverage policies: 3 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56456Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
- A56632Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
Alphabetic index entries that lead here
- Appendicitis›acute(catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative)
- Gangrene, gangrenous›appendix
Code history
Unchanged in every release from FY2024 to FY2027.