K55.1

Chronic vascular disorders of intestine

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 10 never code together

K55code

Excludes1

necrotizing enterocolitis of newborn (P77.-)P77.-

Excludes2

angioectasia (angiodysplasia) duodenum (K31.81-)K31.81-

K00-K95chapter

Excludes2

certain conditions originating in the perinatal period (P04-P96)P04-P96
certain infectious and parasitic diseases (A00-B99)A00-B99
complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
neoplasms (C00-D49)C00-D49
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 6

K55.1code

Inclusion terms

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

Index entries leading here 13

Abdomen, abdominal — see also condition
- angina K55.1
Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
- abdominal K55.1
- mesenteric K55.1
- intestinal K55.1
Insufficiency, insufficient
- arterial I77.1
  - mesenteric K55.1
- vascular I99.8
  - mesenteric K55.1
- mesenteric K55.1
Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) I70.90
- mesenteric (artery) K55.1
Syndrome — see also Disease
- mesenteric
  - artery (superior) K55.1
  - vascular insufficiency K55.1
- ischemic
  - bowel (transient) K55.9
    - chronic K55.1
    - due to mesenteric artery insufficiency K55.1
- superior
  - mesenteric artery K55.1
- Wilkie's K55.1
Ischemia, ischemic I99.8
- bowel (transient)
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- intestine (large) (small) (transient) K55.9
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- small bowel
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
- colon chronic (due to mesenteric artery insufficiency) K55.1
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
- ischemic K55.9
  - chronic K55.1
  - due to mesenteric artery insufficiency K55.1
Enterocolitis K52.9
- hemorrhagic (acute) K55.059
  - chronic K55.1
Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
- ischemic K55.9
  - chronic K55.1
Disorder (of) — see also Disease
- intestine, intestinal
  - vascular K55.9
    - chronic K55.1
Disease, diseased — see also Syndrome
- Wilkie's K55.1
Stricture — see also Stenosis
- intestine — see also Obstruction, intestine
  - ischemic K55.1
Wilkie's disease or syndrome K55.1

Alongside this code 5 same parent — K55

K55.0 Acute vascular disorders of intestine category K55.2 Angiodysplasia of colon category K55.3 Necrotizing enterocolitis category K55.8 Other vascular disorders of intestine K55.9 Vascular disorder of intestine, unspecified

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC108 ESRD21HCC108 ESRD24HCC108

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: K55
Block: K55-K64
Siblings: 5

Present FY2024–FY2027.