1. 2021 ICD-10-CM Index
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2. 'A' Terms
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3. Index Terms Starting With 'A' (Appendicitis)

Index Terms Starting With 'A' (Appendicitis)

• Appendicitis (pneumococcal) (retrocecal) K37

  ICD-10-CM Diagnosis Code K37

  Unspecified appendicitis

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Type 1 Excludes

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

  • acute (catarrhal) (fulminating) (gangrenous) (obstructive) (retrocecal) (suppurative) K35.80
    ICD-10-CM Diagnosis Code K35.80

    Unspecified acute appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Acute appendicitis NOS
    • Acute appendicitis without (localized) (generalized) peritonitis
    • specified NEC K35.890
      ICD-10-CM Diagnosis Code K35.890

      Other acute appendicitis without perforation or gangrene

      2019 - New Code 2020 2021 Billable/Specific Code
      • with gangrene K35.891
        ICD-10-CM Diagnosis Code K35.891

        Other acute appendicitis without perforation, with gangrene

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with gangrene NOS
    • with
      • gangrene K35.891
        ICD-10-CM Diagnosis Code K35.891

        Other acute appendicitis without perforation, with gangrene

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with gangrene NOS
      • peritoneal abscess K35.33
        ICD-10-CM Diagnosis Code K35.33

        Acute appendicitis with perforation and localized peritonitis, with abscess

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with (peritoneal) abscess NOS
        • Ruptured appendix with localized peritonitis and abscess
      • peritonitis NEC K35.33
        ICD-10-CM Diagnosis Code K35.33

        Acute appendicitis with perforation and localized peritonitis, with abscess

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with (peritoneal) abscess NOS
        • Ruptured appendix with localized peritonitis and abscess
        • generalized (with perforation or rupture) K35.20
          ICD-10-CM Diagnosis Code K35.20

          Acute appendicitis with generalized peritonitis, without abscess

          2019 - New Code 2020 2021 Billable/Specific Code

          Applicable To

          • (Acute) appendicitis with generalized peritonitis NOS
          • with abscess K35.21
            ICD-10-CM Diagnosis Code K35.21

            Acute appendicitis with generalized peritonitis, with abscess

            2019 - New Code 2020 2021 Billable/Specific Code
        • localized K35.30
          ICD-10-CM Diagnosis Code K35.30

          Acute appendicitis with localized peritonitis, without perforation or gangrene

          2019 - New Code 2020 2021 Billable/Specific Code

          Applicable To

          • Acute appendicitis with localized peritonitis NOS
          • with
            • gangrene K35.31
              ICD-10-CM Diagnosis Code K35.31

              Acute appendicitis with localized peritonitis and gangrene, without perforation

              2019 - New Code 2020 2021 Billable/Specific Code
            • perforation K35.32
              ICD-10-CM Diagnosis Code K35.32

              Acute appendicitis with perforation and localized peritonitis, without abscess

              2019 - New Code 2020 2021 Billable/Specific Code

              Applicable To

              • (Acute) appendicitis with perforation NOS
              • Perforated appendix NOS
              • Ruptured appendix (with localized peritonitis) NOS
              • and abscess K35.33
                ICD-10-CM Diagnosis Code K35.33

                Acute appendicitis with perforation and localized peritonitis, with abscess

                2019 - New Code 2020 2021 Billable/Specific Code

                Applicable To

                • (Acute) appendicitis with (peritoneal) abscess NOS
                • Ruptured appendix with localized peritonitis and abscess
  • amebic A06.89
    ICD-10-CM Diagnosis Code A06.89

    Other amebic infections

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Amebic appendicitis
    • Amebic splenic abscess
  • chronic K36
    (recurrent)
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • exacerbation - see Appendicitis, acute
  • gangrenous - see Appendicitis, acute
  • healed K36
    (obliterative)
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • interval K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • neurogenic K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • obstructive K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • recurrent K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • relapsing K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • ruptured NOS K35.32
    (with localized peritonitis)
    ICD-10-CM Diagnosis Code K35.32

    Acute appendicitis with perforation and localized peritonitis, without abscess

    2019 - New Code 2020 2021 Billable/Specific Code

    Applicable To

    • (Acute) appendicitis with perforation NOS
    • Perforated appendix NOS
    • Ruptured appendix (with localized peritonitis) NOS
  • subacute K36
    (adhesive)
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • subsiding K36
    ICD-10-CM Diagnosis Code K36

    Other appendicitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Chronic appendicitis
    • Recurrent appendicitis
  • suppurative - see Appendicitis, acute
  • tuberculous A18.32
    ICD-10-CM Diagnosis Code A18.32

    Tuberculous enteritis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Tuberculosis of anus and rectum
    • Tuberculosis of intestine (large) (small)
  • with
    • gangrene K35.891
      ICD-10-CM Diagnosis Code K35.891

      Other acute appendicitis without perforation, with gangrene

      2019 - New Code 2020 2021 Billable/Specific Code

      Applicable To

      • (Acute) appendicitis with gangrene NOS
    • perforation NOS K35.32
      ICD-10-CM Diagnosis Code K35.32

      Acute appendicitis with perforation and localized peritonitis, without abscess

      2019 - New Code 2020 2021 Billable/Specific Code

      Applicable To

      • (Acute) appendicitis with perforation NOS
      • Perforated appendix NOS
      • Ruptured appendix (with localized peritonitis) NOS
    • peritoneal abscess K35.33
      ICD-10-CM Diagnosis Code K35.33

      Acute appendicitis with perforation and localized peritonitis, with abscess

      2019 - New Code 2020 2021 Billable/Specific Code

      Applicable To

      • (Acute) appendicitis with (peritoneal) abscess NOS
      • Ruptured appendix with localized peritonitis and abscess
    • peritonitis NEC K35.33
      ICD-10-CM Diagnosis Code K35.33

      Acute appendicitis with perforation and localized peritonitis, with abscess

      2019 - New Code 2020 2021 Billable/Specific Code

      Applicable To

      • (Acute) appendicitis with (peritoneal) abscess NOS
      • Ruptured appendix with localized peritonitis and abscess
      • generalized (with perforation or rupture) K35.20
        ICD-10-CM Diagnosis Code K35.20

        Acute appendicitis with generalized peritonitis, without abscess

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with generalized peritonitis NOS
        • with abscess K35.21
          ICD-10-CM Diagnosis Code K35.21

          Acute appendicitis with generalized peritonitis, with abscess

          2019 - New Code 2020 2021 Billable/Specific Code
      • localized K35.30
        ICD-10-CM Diagnosis Code K35.30

        Acute appendicitis with localized peritonitis, without perforation or gangrene

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • Acute appendicitis with localized peritonitis NOS
        • with
          • gangrene K35.31
            ICD-10-CM Diagnosis Code K35.31

            Acute appendicitis with localized peritonitis and gangrene, without perforation

            2019 - New Code 2020 2021 Billable/Specific Code
          • perforation K35.32
            ICD-10-CM Diagnosis Code K35.32

            Acute appendicitis with perforation and localized peritonitis, without abscess

            2019 - New Code 2020 2021 Billable/Specific Code

            Applicable To

            • (Acute) appendicitis with perforation NOS
            • Perforated appendix NOS
            • Ruptured appendix (with localized peritonitis) NOS
            • and abscess K35.33
              ICD-10-CM Diagnosis Code K35.33

              Acute appendicitis with perforation and localized peritonitis, with abscess

              2019 - New Code 2020 2021 Billable/Specific Code

              Applicable To

              • (Acute) appendicitis with (peritoneal) abscess NOS
              • Ruptured appendix with localized peritonitis and abscess
      • rupture K35.32
        (with localized peritonitis)
        ICD-10-CM Diagnosis Code K35.32

        Acute appendicitis with perforation and localized peritonitis, without abscess

        2019 - New Code 2020 2021 Billable/Specific Code

        Applicable To

        • (Acute) appendicitis with perforation NOS
        • Perforated appendix NOS
        • Ruptured appendix (with localized peritonitis) NOS