K59.0 – Constipation

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

Non-billable header

ICD-10-CM code K59.0

Code: K59.0 (claims format: K590)
Description: Constipation
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 K59.0

K59.0 is a header code and cannot be used on claims. Choose the most specific code:

K59.00 – Constipation, unspecifiedBillable
K59.01 – Slow transit constipationBillable
K59.02 – Outlet dysfunction constipationBillable
K59.03 – Drug induced constipationBillable
K59.04 – Chronic idiopathic constipationBillable
K59.09 – Other constipationBillable

Notes for K59.0

Excludes1 (not coded here):

fecal impaction (K56.41)

Excludes2 (not included here):

incomplete defecation (R15.0)

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

K59.1 – Functional diarrheaBillable
K59.2 – Neurogenic bowel, not elsewhere classifiedBillable
K59.3 – Megacolon, not elsewhere classifiedHeader
K59.4 – Anal spasmBillable
K59.8 – Other specified functional intestinal disordersHeader
K59.9 – Functional intestinal disorder, unspecifiedBillable

Frequently asked questions

What is ICD-10 code K59.0?

K59.0 is the ICD-10-CM code for constipation, in the block K55-K64 (Other diseases of intestines).

Is K59.0 a billable code?

No. K59.0 is a header code with more specific child codes; report one of the billable codes listed above.

What category does K59.0 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.