2027 ICD-10-CM Diagnosis Code K55.8Other vascular disorders of intestine
ICD-10-CM Codes›K00–K95›K55-K64›K55
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K55.8 is a billable ICD-10-CM diagnosis code for other vascular disorders of intestine. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 25 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.
K55.8 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 108 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 108, ESRD (V21) category 108, and ESRD (V24) category 108 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
K55.8 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired telangiectasia of small and large intestines
- Acute intestinal ischemia due to obstruction of vasculature of intestine
- Acute ischemic colitis
- Acute ischemic enteritis
- Acute vascular insufficiency of intestine
- Angiodysplasia of gastrointestinal tract
- Angiodysplasia of intestine
- Angiodysplasia of small intestine
- Gastrointestinal tract vascular insufficiency
- Increased vascular pattern of colon
- Insufficiency of mesenteric artery
- Superior mesenteric artery syndrome
- Telangiectasia of colon
- Telangiectasia of gastrointestinal tract
- Transient ischemic colitis
- Vascular disorder of large intestine
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K55.8: 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.
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.
- angioectasia (angiodysplasia) duodenum (K31.81-)
- 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.
Disorder (of) See Also: Disease;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Intestinal Vascular Disorder
a non-neoplastic or neoplastic vascular disorder that affects the intestines.
Patient EducationClinical
Digestive Diseases
When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K55.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K55.8Overview
What is the ICD-10 code for other vascular disorders of intestine?
The ICD-10-CM code for other vascular disorders of intestine is K55.8 (sometimes written as K558). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K55.8 (Vascular disorders of intestine) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other vascular disorders of intestine on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K55.8 group to?
When other vascular disorders of intestine 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.
Is K55.8 a CC or MCC?
CMS lists K55.8 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 25 closely related codes in its exclusion list.
Can K55.8 be reported with a code from P77?
Not as a rule. The Excludes1 note at K55, which applies to K55.8, 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).
Does K55.8 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. K55.8 mapped to HCC 108 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 108 (Vascular Disease), ESRD (V21) category 108 (Vascular Disease), and ESRD (V24) category 108 (Vascular Disease).
