K55.9 Vascular disorder of intestine, unspecified

The ICD-10-CM code for Vascular disorder of intestine, unspecified is K55.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K55-K64: Other diseases of intestines (K55-K64)

Category K55

37 codes (27 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K55.9:

• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › ischemic
• Ischemia, ischemic › intestine (large) (small) (transient)
• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › ischemic
• Enterocolitis › ischemic
• Insufficiency, insufficient › vascular › intestine
• Disorder (of) › intestine, intestinal › vascular
• Syndrome › ischemic › bowel (transient)

Inclusion Terms

• Ischemic colitis
• Ischemic enteritis
• Ischemic enterocolitis

U.S. Hospital Utilization

• An estimated 59,685 U.S. inpatient stays in 2023 included K55.9 among the documented diagnoses.
• 13,780 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference K55.9 with the canonical source and edition:

K55.9 — Vascular disorder of intestine, unspecified. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K55.9

Canonical URL: https://icd10codingpro.com/codes/K55.9