K58.9 – Irritable bowel syndrome, unspecified

ICD-10-CM 2027 diagnosis code · Other diseases of intestines

Billable code

ICD-10-CM code K58.9

Code: K58.9 (claims format: K589)
Description: Irritable bowel syndrome, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K55-K64 Other diseases of intestines
Parent codes: K58

Notes for K58.9

Applicable to:

Irritable bowel syndrome NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K58 – Irritable bowel syndrome

Includes:

irritable colon
spastic colon

Index terms for K58.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K58

K58.0 – Irritable bowel syndrome with diarrheaBillable
K58.1 – Irritable bowel syndrome with constipationBillable
K58.2 – Mixed irritable bowel syndromeBillable
K58.8 – Other irritable bowel syndromeBillable

Frequently asked questions

What is ICD-10 code K58.9?

K58.9 is the ICD-10-CM code for irritable bowel syndrome, unspecified, in the block K55-K64 (Other diseases of intestines).

Is K58.9 a billable code?

Yes. K58.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K58.9 belong to?

It belongs to category K58 – Irritable bowel syndrome.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.