ICD-10 Code K59.00 – Constipation, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.00 – Constipation, unspecified
What it is
K59.00 identifies constipation when the provider documents the condition but does not specify the cause, type, or duration. Use it for general constipation without further detail.
Clinical signs
Common features include infrequent bowel movements, hard stools, straining, or a sense of incomplete evacuation. Clinical features vary; refer to documentation.
When to use this code
Use K59.00 when the record states constipation and no additional specification is available. It also fits when the note does not distinguish between functional, chronic, or drug-related constipation. If the cause is documented, code the more specific diagnosis instead.
Do not use for
Do not use this code when constipation is clearly linked to another condition, medication, or procedure and a more specific code is documented. Check documentation.
Coding tip
Query for cause, chronicity, and related conditions before defaulting to unspecified constipation.