ICD-10-CM Codes
K00-K95 Diseases of the digestive system
K55-K64 Other diseases of intestines
K55- Vascular disorders of intestine
2021 ICD-10-CM Diagnosis Code K55.1

2021 ICD-10-CM Diagnosis Code K55.1

Chronic vascular disorders of intestine

2016

2017

2018

2019

2020

2021

Billable/Specific Code

K55.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2021 edition of ICD-10-CM K55.1 became effective on October 1, 2020.
This is the American ICD-10-CM version of K55.1 - other international versions of ICD-10 K55.1 may differ.

Applicable To

Chronic ischemic colitis
Chronic ischemic enteritis
Chronic ischemic enterocolitis
Ischemic stricture of intestine
Mesenteric atherosclerosis
Mesenteric vascular insufficiency

The following code(s) above K55.1 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 K55.1:

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
K55
ICD-10-CM Diagnosis Code K55
Vascular disorders of intestine
Type 1 Excludes
- necrotizing enterocolitis of newborn (P77.-)
Vascular disorders of intestine

Approximate Synonyms

Atherosclerotic disease of superior mesenteric artery
Chronic ischemic colitis
Chronic ischemic enteritis
Chronic ischemic enterocolitis
Chronic mesenteric ischemia
Chronic thrombosis of mesenteric vein
Chronic vascular insufficiency of intestine
Ischemic colitis, chronic
Ischemic enteritis, chronic
Ischemic enterocolitis, chronic
Ischemic stricture of intestine
Ischemic stricture, intestine
Mesenteric vein thrombosis, chronic
Occlusion of superior mesenteric artery
Superior mesenteric artery syndrome
Vascular insufficiency of intestine, chronic

ICD-10-CM K55.1 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 K55.1 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

Code annotations containing back-references to K55.1:

Type 1 Excludes: K56

ICD-10-CM Diagnosis Code K56
Paralytic ileus and intestinal obstruction without hernia
Type 1 Excludes
- congenital stricture or stenosis of intestine (Q41-Q42)
- cystic fibrosis with meconium ileus (E84.11)
- ischemic stricture of intestine (K55.1)
- meconium ileus NOS (P76.0)
- neonatal intestinal obstructions classifiable to P76.-
- obstruction of duodenum (K31.5)
- postprocedural intestinal obstruction (K91.3-)
Type 2 Excludes
- stenosis of anus or rectum (K62.4)
Type 2 Excludes: I70

ICD-10-CM Diagnosis Code I70
Atherosclerosis
Includes
- arteriolosclerosis
- arterial degeneration
- arteriosclerosis
- arteriosclerotic vascular disease
- arteriovascular degeneration
- atheroma
- endarteritis deformans or obliterans
- senile arteritis
- senile endarteritis
- vascular degeneration
Type 2 Excludes
- arteriosclerotic cardiovascular disease (I25.1-)
- arteriosclerotic heart disease (I25.1-)
- atheroembolism (I75.-)
- cerebral atherosclerosis (I67.2)
- coronary atherosclerosis (I25.1-)
- mesenteric atherosclerosis (K55.1)
- precerebral atherosclerosis (I67.2)
- primary pulmonary atherosclerosis (I27.0)
Use Additional
- code to identify:
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)

Diagnosis Index entries containing back-references to K55.1:

Abdomen, abdominal - see also condition
- angina K55.1
Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
ICD-10-CM Diagnosis Code I20.9
Angina pectoris, unspecified
Applicable To
Angina NOS
Anginal syndrome
Cardiac angina
Ischemic chest pain
- abdominal K55.1
- intestinal K55.1
- mesenteric K55.1
Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) I70.90
ICD-10-CM Diagnosis Code I70.90
Unspecified atherosclerosis
- mesenteric K55.1 (artery)
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
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
  ICD-10-CM Diagnosis Code K55.9
  Vascular disorder of intestine, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  Applicable To
  Ischemic colitis
  Ischemic enteritis
  Ischemic enterocolitis
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
Disease, diseased - see also Syndrome
- Wilkie's K55.1
Disorder (of) - see also Disease
- intestine, intestinal
  - vascular K55.9
    ICD-10-CM Diagnosis Code K55.9
    Vascular disorder of intestine, unspecified
    2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    Ischemic colitis
    Ischemic enteritis
    Ischemic enterocolitis
    - chronic K55.1
Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
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
  ICD-10-CM Diagnosis Code K55.9
  Vascular disorder of intestine, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  Applicable To
  Ischemic colitis
  Ischemic enteritis
  Ischemic enterocolitis
  - chronic K55.1
Enterocolitis K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
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)
- hemorrhagic (acute) K55.059
  - see also Ischemia, intestine, acute
  ICD-10-CM Diagnosis Code K55.059
  Acute (reversible) ischemia of intestine, part and extent unspecified
  2017 - New Code 2018 2019 2020 2021 Billable/Specific Code
  - chronic K55.1
Insufficiency, insufficient
- arterial I77.1
  ICD-10-CM Diagnosis Code I77.1
  Stricture of artery
  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  Applicable To
  Narrowing of artery
  - mesenteric K55.1
- vascular I99.8
  ICD-10-CM Diagnosis Code I99.8
  Other disorder of circulatory system
  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  - mesenteric K55.1
- mesenteric K55.1
Ischemia, ischemic I99.8
ICD-10-CM Diagnosis Code I99.8
Other disorder of circulatory system
- bowel (transient)
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- intestine (large) (small) (transient) K55.9
  ICD-10-CM Diagnosis Code K55.9
  Vascular disorder of intestine, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  Applicable To
  Ischemic colitis
  Ischemic enteritis
  Ischemic enterocolitis
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- small bowel
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- colon chronic K55.1 (due to mesenteric artery insufficiency)
Stricture - see also Stenosis
- intestine - see also Obstruction, intestine
  - ischemic K55.1
Syndrome - see also Disease
- ischemic
  - bowel (transient) K55.9
    ICD-10-CM Diagnosis Code K55.9
    Vascular disorder of intestine, unspecified
    2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    Ischemic colitis
    Ischemic enteritis
    Ischemic enterocolitis
    - chronic K55.1
    - due to mesenteric artery insufficiency K55.1
- mesenteric
  - artery K55.1 (superior)
  - vascular insufficiency K55.1
- superior
  - mesenteric artery K55.1
- Wilkie's K55.1
Wilkie's disease or syndrome K55.1

ICD-10-CM Codes Adjacent To K55.1

K55.042 Diffuse acute infarction of large intestine

K55.049 …… extent unspecified

K55.05 Acute (reversible) ischemia of intestine, part unspecified

K55.051 Focal (segmental) acute (reversible) ischemia of intestine, part unspecified

K55.052 Diffuse acute (reversible) ischemia of intestine, part unspecified

K55.059 Acute (reversible) ischemia of intestine, part and extent unspecified

K55.06 Acute infarction of intestine, part unspecified

K55.061 Focal (segmental) acute infarction of intestine, part unspecified

K55.062 Diffuse acute infarction of intestine, part unspecified

K55.069 Acute infarction of intestine, part and extent unspecified

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

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

2021 ICD-10-CM Diagnosis Code K55.1

Chronic vascular disorders of intestine

Diseases of the digestive system

Vascular disorders of intestine

Paralytic ileus and intestinal obstruction without hernia

Atherosclerosis

Angina pectoris, unspecified

Unspecified atherosclerosis

Noninfective gastroenteritis and colitis, unspecified

Vascular disorder of intestine, unspecified

Vascular disorder of intestine, unspecified

Noninfective gastroenteritis and colitis, unspecified

Vascular disorder of intestine, unspecified

Noninfective gastroenteritis and colitis, unspecified

Acute (reversible) ischemia of intestine, part and extent unspecified

Stricture of artery

Other disorder of circulatory system

Other disorder of circulatory system

Vascular disorder of intestine, unspecified

Vascular disorder of intestine, unspecified