Vascular disorders of intestine (K55) ICD-10-CM
The K55 code range covers vascular disorders of intestine with 37 ICD-10-CM diagnosis codes. 27 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- necrotizing enterocolitis of newborn P77
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- angioectasia angiodysplasia duodenum K31.81
Codes in the K55 Range 37 codes · 27 billable
- K55 Vascular disorders of intestineNon-billable
- K55.0 Acute vascular disorders of intestineNon-billable
- K55.01 Acute (reversible) ischemia of small intestineNon-billable
- K55.011 Focal (segmental) acute (reversible) ischemia of small intestine
- K55.012 Diffuse acute (reversible) ischemia of small intestine
- K55.019 Acute (reversible) ischemia of small intestine, extent unspecified
- K55.02 Acute infarction of small intestineNon-billable
- K55.021 Focal (segmental) acute infarction of small intestine
- K55.022 Diffuse acute infarction of small intestine
- K55.029 Acute infarction of small intestine, extent unspecified
- K55.03 Acute (reversible) ischemia of large intestineNon-billable
- K55.031 Focal (segmental) acute (reversible) ischemia of large intestine
- K55.032 Diffuse acute (reversible) ischemia of large intestine
- K55.039 Acute (reversible) ischemia of large intestine, extent unspecified
- K55.04 Acute infarction of large intestineNon-billable
- K55.041 Focal (segmental) acute infarction of large intestine
- K55.042 Diffuse acute infarction of large intestine
- K55.049 Acute infarction of large intestine, extent unspecified
- K55.05 Acute (reversible) ischemia of intestine, part unspecifiedNon-billable
- 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 unspecifiedNon-billable
- 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 colonNon-billable
- K55.20 Angiodysplasia of colon without hemorrhage
- K55.21 Angiodysplasia of colon with hemorrhage
- K55.3 Necrotizing enterocolitisNon-billable
- K55.30 Necrotizing enterocolitis, 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K55 range.
Angiodysplasia
Acquired degenerative dilation or expansion (ectasia) of normal BLOOD VESSELS, often associated with aging. They are isolated, tortuous, thin-walled vessels and sources of bleeding. They occur most often in mucosal capillaries of the GASTROINTESTINAL TRACT leading to GASTROINTESTINAL HEMORRHAGE and ANEMIA.
Enterocolitis, Necrotizing
ENTEROCOLITIS with extensive ulceration (ULCER) and NECROSIS. It is observed primarily in LOW BIRTH WEIGHT INFANT.
Intestinal Vascular Disorder
A non-neoplastic or neoplastic vascular disorder that affects the intestines.
About the K55 Code Range
These disorders affect blood vessels in the intestine. The codes distinguish sudden and long-lasting disorders, as well as specific conditions.
K55.0 groups acute disorders by reversible ischemia (reduced blood flow) or infarction (tissue death). Its subdivisions separate the small intestine, large intestine, and unspecified part, then distinguish focal, diffuse, and unspecified extent. K55.1 covers chronic, or long-lasting, vascular disorders.
K55.2 identifies angiodysplasia of the colon, a blood vessel abnormality, with or without hemorrhage (bleeding). K55.3 groups necrotizing enterocolitis, intestinal inflammation with tissue death, by stage 1, 2, 3, or unspecified stage. K55.8 covers other vascular disorders of the intestine; K55.9 is unspecified.
Questions About This Page
How many billable codes are in the K55 range?
Of the 37 codes in this range, 27 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the K55 range classify?
The range classifies vascular disorders of intestine. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
