K35.20
⚠ Non-billable
Acute appendicitis with generalized peritonitis, without abscess
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K35.20
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code K35.20?
ICD-10-CM code K35.20 represents Acute appendicitis with generalized peritonitis, without abscess. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K35.20 billable?
No. K35.20 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K35.20 in?
K35.20 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K35 category
K35
Acute appendicitis
Non-billable
K35.2
Acute appendicitis with generalized peritonitis
Non-billable
K35.3
Acute appendicitis with localized peritonitis
Non-billable
K35.8
Other and unspecified acute appendicitis
Non-billable
K35.21
Acute appendicitis with generalized peritonitis, with abscess
Non-billable
K35.30
Acute appendicitis with localized peritonitis, without perforation or gangrene
Billable
K35.31
Acute appendicitis with localized peritonitis and gangrene, without perforation
Billable
K35.32
Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
Billable
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