ICD-10-CM 2027 diagnosis code

K58Irritable bowel syndrome

Not billable — use a more specific code

K58 is a header code, so it can't be reported by itself. Choose one of the 5 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 K58

K58 is the ICD-10-CM diagnosis code for irritable bowel syndrome. 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 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: K58.0 (with diarrhea), K58.1 (with constipation), K58.2 (syndrome), K58.8 (syndrome) and K58.9 (unspecified).

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 K58

Coding notes

IncludesFurther defines the content of the category

irritable colon
spastic colon

Notes that apply from higher levels

Instructions written at a parent level also apply to K58.

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

Codes whose notes reference K58

F54Code first

Code history

2016
2017
2018
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 K58

Is K58 billable?: No. K58 is a header code. Report one of its more specific subcodes instead.