2024 ICD-10-CM Diagnosis Code K35.209

Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation

• K35.209 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Ac appendicitis w gen peritonitis,w/o abscs,unsp as to perf
• ICD-10-CM K35.209 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of K35.209 – other international versions of ICD-10 K35.209 may differ.

Applicable To

• (Acute) appendicitis with generalized peritonitis NOS

The following code(s) above K35.209 contain annotation back-references

 that may be applicable to K35.209:

• K00-K95  Diseases of the digestive system

ICD-10-CM K35.209 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 371 Major gastrointestinal disorders and peritoneal infections with mcc
• 372 Major gastrointestinal disorders and peritoneal infections with cc
• 373 Major gastrointestinal disorders and peritoneal infections without cc/mcc

Code History

• 2024 (effective 10/1/2023): New code

Diagnosis Index entries containing back-references to K35.209:

• Appendicitis (pneumococcal) (retrocecal) K37
  • with
    • peritonitis NECK35.33
      • generalized K35.209
  • acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) K35.80
    • with
      • peritonitis NECK35.33
        • generalized K35.209
• Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9
  • with or following
    • appendicitis
      • generalized K35.209 – see also Appendicitis