K35.209
✓ Billable
Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K35.209
System
ICD-10-CM
Billable
Yes — valid for submission
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 K35.209?
ICD-10-CM code K35.209 represents Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation. It is a billable diagnosis code in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K35.209 billable?
Yes. K35.209 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is K35.209 in?
K35.209 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
K35.20
Acute appendicitis with generalized peritonitis, without abscess
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
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