2027 ICD-10-CM Diagnosis Code K55.20Angiodysplasia of colon without hemorrhage

ICD-10-CM Codes›K00–K95›K55-K64›K55

ICD-10-CM K55.20
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K55.20 is a billable ICD-10-CM diagnosis code for angiodysplasia of colon without hemorrhage. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. Coders also document this condition as angiodysplasia of colon. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders and Peripheral and visceral vascular disease.

Code Identity

ICD-10-CM Code
K55.20
Billable Status
Yes — Valid for Submission
Code Describes
Angiodysplasia of colon without hemorrhage
Short Description
Angiodysplasia of colon without hemorrhage
Same as the full description in the CMS dataset.
Parent Code
K55.2
Angiodysplasia of colon

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK55Vascular disorders of intestine
This CodeK55.20Angiodysplasia of colon without hemorrhage

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angiodysplasia of colon
  • Angiodysplasia of duodenum
  • Angiodysplasia of gastrointestinal tract
  • Angiodysplasia of intestine
  • Angiodysplasia of large intestine
  • Angiodysplasia of small intestine
  • Disorder of vascular structure of duodenum
  • Vascular disorder of large intestine
  • Vascular ectasia of cecum

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K55.20: its own notes plus those printed at K55 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From K55 Vascular disorders of intestine applies to 27 codes
  • necrotizing enterocolitis of newborn (P77.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From K55 Vascular disorders of intestine applies to 27 codes
  • angioectasia (angiodysplasia) duodenum (K31.81-)
From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR026
Peripheral and visceral vascular disease
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • 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.

Patient EducationClinical

Colonic Diseases

Your colon, also known as the large intestine, is part of your digestive system. It's a long, hollow tube at the end of your digestive tract where your body makes and stores stool. Many disorders affect the colon's ability to work properly. Some of these include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K55.20 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
569.84 Angio intes w/o hmrhg
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K55.20Overview

What is the ICD-10 code for angiodysplasia of colon without hemorrhage?

The ICD-10-CM code for angiodysplasia of colon without hemorrhage is K55.20 (sometimes written as K5520). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K55.20 (Angiodysplasia of colon) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report angiodysplasia of colon without hemorrhage on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K55.20 group to?

When angiodysplasia of colon without hemorrhage is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.

Can K55.20 be reported with a code from P77?

Not as a rule. The Excludes1 note at K55, which applies to K55.20, lists "necrotizing enterocolitis of newborn (P77.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of K55.20?

Under the General Equivalence Mappings, angiodysplasia of colon without hemorrhage converts to ICD-9-CM 569.84 (angio intes w/o hmrhg). The mapping is a direct match.