K59.00 – Constipation, unspecified

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

Billable code

ICD-10-CM code K59.00

Code: K59.00 (claims format: K5900)
Description: Constipation, 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: K59 › K59.0

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.-)

K59.0 – Constipation

Excludes1 (not coded here):

fecal impaction (K56.41)

Excludes2 (not included here):

incomplete defecation (R15.0)

Index terms for K59.00

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

Related codes in K59.0

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

Frequently asked questions

What is ICD-10 code K59.00?

K59.00 is the ICD-10-CM code for constipation, unspecified, in the block K55-K64 (Other diseases of intestines).

Is K59.00 a billable code?

Yes. K59.00 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K59.00 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.