2021 ICD-10-CM Diagnosis Code K40.90

Unilateral inguinal hernia, without obstruction or gangrene, not specified as recurrent

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • K40.90 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Unil inguinal hernia, w/o obst or gangr, not spcf as recur
  • The 2021 edition of ICD-10-CM K40.90 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of K40.90 - other international versions of ICD-10 K40.90 may differ.
Applicable To
  • Inguinal hernia NOS
  • Unilateral inguinal hernia NOS
The following code(s) above K40.90 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 K40.90:
  • K00-K95
    2021 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
  • K40-K46
    2021 ICD-10-CM Range K40-K46


    • acquired hernia
    • congenital [except diaphragmatic or hiatus] hernia
    • recurrent hernia
    • Hernia with both gangrene and obstruction is classified to hernia with gangrene.
  • K40
    ICD-10-CM Diagnosis Code K40

    Inguinal hernia

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    • bubonocele
    • direct inguinal hernia
    • double inguinal hernia
    • indirect inguinal hernia
    • inguinal hernia NOS
    • oblique inguinal hernia
    • scrotal hernia
    Inguinal hernia
Approximate Synonyms
  • Direct inguinal hernia
  • Indirect inguinal hernia
  • Inguinal hernia
  • Left direct inguinal hernia
  • Left indirect inguinal hernia
  • Left inguinal hernia
  • Right direct inguinal hernia
  • Right indirect inguinal hernia
  • Right inguinal hernia
Clinical Information
  • An abdominal hernia with an external bulge in the groin region. It can be classified by the location of herniation. Indirect inguinal hernias occur through the internal inguinal ring. Direct inguinal hernias occur through defects in the abdominal wall (transversalis fascia) in hesselbach's triangle. The former type is commonly seen in children and young adults; the latter in adults.
  • The protrusion of a sac-like structure containing fibroadipose tissue through an abnormal opening in the inguinal region.
ICD-10-CM K40.90 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 393 Other digestive system diagnoses with mcc
  • 394 Other digestive system diagnoses with cc
  • 395 Other digestive system diagnoses without cc/mcc

Convert K40.90 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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to K40.90:
  • Hernia, hernial (acquired) (recurrent) K46.9
    ICD-10-CM Diagnosis Code K46.9

    Unspecified abdominal hernia without obstruction or gangrene

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Abdominal hernia NOS
    • inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding) K40.90
      • unilateral K40.90
        • not specified as recurrent K40.90
      • not specified as recurrent K40.90

ICD-10-CM Codes Adjacent To K40.90
K40.2 Bilateral inguinal hernia, without obstruction or gangrene
K40.20 …… not specified as recurrent
K40.21 …… recurrent
K40.3 Unilateral inguinal hernia, with obstruction, without gangrene
K40.30 …… not specified as recurrent
K40.31 …… recurrent
K40.4 Unilateral inguinal hernia, with gangrene
K40.40 …… not specified as recurrent
K40.41 …… recurrent
K40.9 Unilateral inguinal hernia, without obstruction or gangrene
K40.90 …… not specified as recurrent
K40.91 …… recurrent
K41 Femoral hernia
K41.0 Bilateral femoral hernia, with obstruction, without gangrene
K41.00 …… not specified as recurrent
K41.01 …… recurrent
K41.1 Bilateral femoral hernia, with gangrene
K41.10 …… not specified as recurrent
K41.11 …… recurrent
K41.2 Bilateral femoral hernia, without obstruction or gangrene
K41.20 …… 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.