2020 ICD-10-CM Diagnosis Code K55.9

Vascular disorder of intestine, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • K55.9 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 K55.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K55.9 - other international versions of ICD-10 K55.9 may differ.
Applicable To
  • Ischemic colitis
  • Ischemic enteritis
  • Ischemic enterocolitis
The following code(s) above K55.9 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 K55.9:
  • 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
  • K55
    ICD-10-CM Diagnosis Code K55

    Vascular disorders of intestine

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • necrotizing enterocolitis of newborn (P77.-)
    Vascular disorders of intestine
Approximate Synonyms
  • Ischemic colitis
  • Vascular insufficiency of intestine
Clinical Information
  • Inflammation of the colon due to colonic ischemia resulting from alterations in systemic circulation or local vasculature.
ICD-10-CM K55.9 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 K55.9 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 K55.9:
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
    - see also Enteritis
    ICD-10-CM Diagnosis Code K52.9

    Noninfective gastroenteritis and colitis, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Colitis NOS
    • Enteritis NOS
    • Gastroenteritis NOS
    • Ileitis NOS
    • Jejunitis NOS
    • Sigmoiditis NOS
    Type 1 Excludes
    • diarrhea NOS (R19.7)
    • functional diarrhea (K59.1)
    • infectious gastroenteritis and colitis NOS (A09)
    • neonatal diarrhea (noninfective) (P78.3)
    • psychogenic diarrhea (F45.8)
  • Disorder (of) - see also Disease
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
    ICD-10-CM Diagnosis Code K52.9

    Noninfective gastroenteritis and colitis, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Colitis NOS
    • Enteritis NOS
    • Gastroenteritis NOS
    • Ileitis NOS
    • Jejunitis NOS
    • Sigmoiditis NOS
    Type 1 Excludes
    • diarrhea NOS (R19.7)
    • functional diarrhea (K59.1)
    • infectious gastroenteritis and colitis NOS (A09)
    • neonatal diarrhea (noninfective) (P78.3)
    • psychogenic diarrhea (F45.8)
  • Enterocolitis K52.9
    - see also Enteritis
    ICD-10-CM Diagnosis Code K52.9

    Noninfective gastroenteritis and colitis, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Colitis NOS
    • Enteritis NOS
    • Gastroenteritis NOS
    • Ileitis NOS
    • Jejunitis NOS
    • Sigmoiditis NOS
    Type 1 Excludes
    • diarrhea NOS (R19.7)
    • functional diarrhea (K59.1)
    • infectious gastroenteritis and colitis NOS (A09)
    • neonatal diarrhea (noninfective) (P78.3)
    • psychogenic diarrhea (F45.8)
    • ischemic K55.9
  • Insufficiency, insufficient
    • vascular I99.8
      ICD-10-CM Diagnosis Code I99.8

      Other disorder of circulatory system

        2016 2017 2018 2019 2020 Billable/Specific Code
  • Ischemia, ischemic I99.8
    ICD-10-CM Diagnosis Code I99.8

    Other disorder of circulatory system

      2016 2017 2018 2019 2020 Billable/Specific Code
  • Syndrome - see also Disease

ICD-10-CM Codes Adjacent To K55.9
K55.1 Chronic vascular disorders of intestine
K55.2 Angiodysplasia of colon
K55.20 …… without hemorrhage
K55.21 …… with hemorrhage
K55.3 Necrotizing enterocolitis
K55.30 …… unspecified
K55.31 Stage 1 necrotizing enterocolitis
K55.32 Stage 2 necrotizing enterocolitis
K55.33 Stage 3 necrotizing enterocolitis
K55.8 Other vascular disorders of intestine
K55.9 Vascular disorder of intestine, unspecified
K56 Paralytic ileus and intestinal obstruction without hernia
K56.0 Paralytic ileus
K56.1 Intussusception
K56.2 Volvulus
K56.3 Gallstone ileus
K56.4 Other impaction of intestine
K56.41 Fecal impaction
K56.49 Other impaction of intestine
K56.5 Intestinal adhesions [bands] with obstruction (postinfection)
K56.50 Intestinal adhesions [bands], unspecified as to partial versus complete obstruction

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