ICD-10-CM 2027 diagnosis code

K55Vascular disorders of intestine

Not billable — use a more specific code

K55 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K55

K55 is the ICD-10-CM diagnosis code for vascular disorders of intestine. It belongs to block K55-K64 (other diseases of intestines) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: K55.0 (intestine), K55.1 (intestine), K55.2 (colon), K55.3 (enterocolitis), K55.8 (intestine) and K55.9 (unspecified).

Don't report K55 together with the conditions in its Excludes1 note: necrotizing enterocolitis of newborn (P77.-).

The conditions in its Excludes2 note aren't part of K55, but may be coded alongside it if the patient has both: angioectasia (angiodysplasia) duodenum (K31.81-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under K55

Coding notes

Excludes1Not coded here — never report together with this code

necrotizing enterocolitis of newborn (P77.-)

Excludes2Not included here — may be reported together if both conditions exist

angioectasia (angiodysplasia) duodenum (K31.81-)

Notes that apply from higher levels

Instructions written at a parent level also apply to K55.

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Code history

2016
2017
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2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about K55

Is K55 billable?: No. K55 is a header code. Report one of its more specific subcodes instead.