2020 ICD-10-CM Diagnosis Code K37

Unspecified appendicitis

    2016 2017 2018 2019 2020 Billable/Specific Code
  • K37 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM K37 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K37 - other international versions of ICD-10 K37 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as K37. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • -unspecified appendicitis with peritonitis (
    ICD-10-CM Diagnosis Code K35.2

    Acute appendicitis with generalized peritonitis

      2016 2017 2018 2019 - Converted to Parent Code 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Appendicitis (acute) with generalized (diffuse) peritonitis following rupture or perforation of appendix
    K35.2-
    ,
    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-
    )
The following code(s) above K37 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 K37:
  • 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
  • Appendicitis
  • Periappendicitis
Clinical Information
  • Acute inflammation of the appendix. Acute appendicitis is classified as simple, gangrenous, or perforated.
  • The appendix is a small, tube-like organ attached to the first part of the large intestine. It is located in the lower right part of the abdomen. It has no known function. A blockage inside of the appendix causes appendicitis. The blockage leads to increased pressure, problems with blood flow, and inflammation. If the blockage is not treated, the appendix can burst and spread infection into the abdomen. This causes a condition called peritonitis.the main symptom is pain in the abdomen, often on the right side. It is usually sudden gets worse over time. Other symptoms may include
    • swelling in the abdomen
    • loss of appetite
    • nausea and vomiting
    • constipation or diarrhea
    • inability to pass gas
    • low fever
    not everyone with appendicitis has all these symptoms.appendicitis is a medical emergency. Treatment almost always involves removing the appendix. Anyone can get appendicitis, but it is more common among people 10 and 30 years old. national institute of diabetes and digestive and kidney diseases
ICD-10-CM K37 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 393 Other digestive system diagnoses with mcc
  • 394 Other digestive system diagnoses with cc
  • 395 Other digestive system diagnoses without cc/mcc

Convert K37 to ICD-9-CM

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

Diagnosis Index entries containing back-references to K37:
  • Appendicitis (pneumococcal) (retrocecal) K37
  • Perityphlitis K37

ICD-10-CM Codes Adjacent To K37
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
K37 Unspecified appendicitis
K38 Other diseases of appendix
K38.0 Hyperplasia of appendix
K38.1 Appendicular concretions
K38.2 Diverticulum of appendix
K38.3 Fistula of appendix
K38.8 Other specified diseases of appendix
K38.9 Disease of appendix, unspecified
K40 Inguinal hernia
K40.0 Bilateral inguinal hernia, with obstruction, without gangrene
K40.00 …… not specified as recurrent

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