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K37

K37: Unspecified appendicitis

Billable / specific codeICD-10-CM

K37 is a billable, specific ICD-10-CM code for unspecified appendicitis. It is valid for submission on a claim.

Check K37 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • unspecified appendicitis with peritonitis (K35.2-, K35.3-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

K37 is named in 1 Medicare coverage policy: 1 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56421Billing and Coding: CT of the Abdomen and Pelvis

Alphabetic index entries that lead here

  • Appendicitis(pneumococcal) (retrocecal)
  • Perityphlitis

Code history

Unchanged in every release from FY2024 to FY2027.

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.