ICD-10 Code K59.0 – Constipation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.0 – Constipation
What it is
K59.0 identifies constipation, a condition marked by infrequent or difficult passage of stool. Use it when the record documents constipation as the diagnosed problem.
Clinical signs
Typical findings include hard stools, straining, reduced bowel movement frequency, and a sense of incomplete evacuation. Clinical features vary; refer to documentation.
When to use this code
Use K59.0 when the clinician documents constipation as the reason for evaluation or an active diagnosis. It also fits when constipation is a symptom being managed during a visit, even if the cause is not fully established.
If the note specifies constipation due to another condition or medication, confirm whether a more specific code is required. Check documentation for the documented cause and any associated disorder.
Do not use for
Do not use K59.0 for fecal impaction unless the record supports constipation and impaction coding separately. Do not assign it when constipation is only suspected or not documented clearly.
Coding tip
Code the documented type and cause of constipation whenever the record gives enough detail.