2020 ICD-10-CM Diagnosis Code K35.3

Acute appendicitis with localized peritonitis

    2016 2017 2018 2019 - Converted to Parent Code 2020 Non-Billable/Non-Specific Code
  • K35.3 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM K35.3 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K35.3 - other international versions of ICD-10 K35.3 may differ.
The following code(s) above K35.3 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to K35.3:
  • K00-K95
    2020 ICD-10-CM Range K00-K95

    Diseases of the digestive system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the digestive system
Approximate Synonyms
  • Acute appendicitis with peritoneal abscess
  • Localized peritonitis due to acute appendicitis
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): Deleted code
  • 2019 (effective 10/1/2018): New code
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to K35.3:
  • Type 1 Excludes: K37
    ICD-10-CM Diagnosis Code K37

    Unspecified appendicitis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
  • Type 2 Excludes: K63.0
    , K63.1
    ICD-10-CM Diagnosis Code K63.0

    Abscess of intestine

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
    Type 2 Excludes
    • abscess of anal and rectal regions (K61.-)
    • abscess of appendix (K35.3-)
    ICD-10-CM Diagnosis Code K63.1

    Perforation of intestine (nontraumatic)

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Perforation (nontraumatic) of rectum
    Type 1 Excludes
    • perforation (nontraumatic) of duodenum (K26.-)
    • perforation (nontraumatic) of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)
    Type 2 Excludes
ICD-10-CM Codes Adjacent To K35.3
K31.819 …… without bleeding
K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum
K31.83 Achlorhydria
K31.84 Gastroparesis
K31.89 Other diseases of stomach and duodenum
K31.9 Disease of stomach and duodenum, unspecified
K35 Acute appendicitis
K35.2 Acute appendicitis with generalized peritonitis
K35.20 …… without abscess
K35.21 …… with abscess
K35.3 Acute appendicitis with localized peritonitis
K35.30 …… without perforation or gangrene
K35.31 …… and gangrene, without perforation
K35.32 Acute appendicitis with perforation and localized peritonitis, without abscess
K35.33 Acute appendicitis with perforation and localized peritonitis, with abscess
K35.8 Other and unspecified acute appendicitis
K35.80 Unspecified acute appendicitis
K35.89 Other acute appendicitis
K35.890 …… without perforation or gangrene
K35.891 …… without perforation, with gangrene
K36 Other appendicitis

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