ICD-10 Code K59.02 – Outlet dysfunction constipation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.02 – Outlet dysfunction constipation
What it is
Outlet dysfunction constipation is constipation caused by difficulty expelling stool from the rectum. It reflects impaired pelvic floor or anal sphincter coordination rather than slow bowel transit alone.
Clinical signs
Patients may report straining, incomplete evacuation, or a sense of blockage during defecation. Clinical features vary; refer to documentation, especially when pelvic floor dysfunction or abnormal rectal emptying is noted.
When to use this code
Use K59.02 when the provider documents outlet dysfunction constipation, obstructed defecation, or a similar diagnosis tied to impaired stool passage at the outlet. Apply it when the constipation is specifically described as due to pelvic floor or anal outlet dysfunction.
Do not assume this code for unspecified constipation or constipation from medications, dehydration, or generalized bowel motility problems. If the record does not clearly identify outlet dysfunction, check documentation before coding.
Do not use for
Do not use K59.02 for chronic idiopathic constipation, functional constipation, or constipation without a documented outlet component. It is also not the correct choice when another cause is clearly identified.
Coding tip
Look for provider wording that links constipation to outlet obstruction, pelvic floor dyssynergia, or impaired evacuation before assigning K59.02.