K59.8 – Other specified functional intestinal disorders

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

Non-billable header

ICD-10-CM code K59.8

Code: K59.8 (claims format: K598)
Description: Other specified functional intestinal disorders
Billable: No – use a more specific code below
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: K59

Billable codes under K59.8

K59.8 is a header code and cannot be used on claims. Choose the most specific code:

K59.81 – Ogilvie syndromeBillable
K59.89 – Other specified functional intestinal disordersBillable

Notes inherited from parent codes

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

K59 – Other functional intestinal disorders

Excludes1 (not coded here):

change in bowel habit NOS (R19.4)
intestinal malabsorption (K90.-)
psychogenic intestinal disorders (F45.8)

Excludes2 (not included here):

functional disorders of stomach (K31.-)

Related codes in K59

K59.0 – ConstipationHeader
K59.1 – Functional diarrheaBillable
K59.2 – Neurogenic bowel, not elsewhere classifiedBillable
K59.3 – Megacolon, not elsewhere classifiedHeader
K59.4 – Anal spasmBillable
K59.9 – Functional intestinal disorder, unspecifiedBillable

Frequently asked questions

What is ICD-10 code K59.8?

K59.8 is the ICD-10-CM code for other specified functional intestinal disorders, in the block K55-K64 (Other diseases of intestines).

Is K59.8 a billable code?

No. K59.8 is a header code with more specific child codes; report one of the billable codes listed above.

What category does K59.8 belong to?

It belongs to category K59 – Other functional intestinal disorders.

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.