1. ICD-10-CM Codes
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2. K00-K95 Diseases of the digestive system
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3. K35-K38 Diseases of appendix
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4. K35- Acute appendicitis
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2020 ICD-10-CM Diagnosis Code K35.30

Acute appendicitis with localized peritonitis, without perforation or gangrene

2019 - New Code 2020 Billable/Specific Code

• K35.30 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Acute appendicitis with loc peritonitis, w/o perf or gangr
• The 2020 edition of ICD-10-CM K35.30 became effective on October 1, 2019.
• This is the American ICD-10-CM version of K35.30 - other international versions of ICD-10 K35.30 may differ.

• 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

• 2019 (effective 10/1/2018): New code
• 2020 (effective 10/1/2019): No change

• Appendicitis (pneumococcal) (retrocecal) K37
  ICD-10-CM Diagnosis Code K37

  Unspecified appendicitis

  2016 2017 2018 2019 2020 Billable/Specific Code

  Type 1 Excludes

  • -unspecified appendicitis with peritonitis (K35.2-, K35.3-)
  • with
    • peritonitis NEC K35.33
      ICD-10-CM Diagnosis Code K35.33

      Acute appendicitis with perforation and localized peritonitis, with abscess

      2019 - New Code 2020 Billable/Specific Code

      Applicable To

      • (Acute) appendicitis with (peritoneal) abscess NOS
      • Ruptured appendix with localized peritonitis and abscess
      • localized K35.30
  • acute (catarrhal) (fulminating) (gangrenous) (obstructive) (retrocecal) (suppurative) K35.80
    ICD-10-CM Diagnosis Code K35.80

    Unspecified acute appendicitis

    2016 2017 2018 2019 2020 Billable/Specific Code

    Applicable To

    • Acute appendicitis NOS
    • Acute appendicitis without (localized) (generalized) peritonitis
    • with
      • peritonitis NEC K35.33
        ICD-10-CM Diagnosis Code K35.33

        Acute appendicitis with perforation and localized peritonitis, with abscess

        2019 - New Code 2020 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with (peritoneal) abscess NOS
        • Ruptured appendix with localized peritonitis and abscess
        • localized K35.30
• Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9
  ICD-10-CM Diagnosis Code K65.9

  Peritonitis, unspecified

  2016 2017 2018 2019 2020 Billable/Specific Code

  Applicable To

  • Bacterial peritonitis NOS
  • with or following
    • appendicitis
      • localized K35.30 - see also Appendicitis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.