ICD-10 Code K59.09 – Other constipation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.09 – Other constipation
What it is
K59.09 identifies constipation that does not fit a more specific ICD-10 constipation code. Use it for documented constipation when the record does not support a different subtype.
Clinical signs
Typical findings 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 K59.09 when the provider documents constipation but does not specify chronic, drug-induced, or another defined cause. It is also appropriate when the note describes constipation without enough detail for a more specific code.
Review the chart for underlying conditions, medication effects, or bowel obstruction before assigning this code. If the documentation identifies a specific cause or subtype, code that condition instead.
Do not use for
Do not use this code for constipation with a documented specific etiology, such as drug-induced or due to another condition. Check documentation if bowel obstruction or another gastrointestinal disorder is the primary issue.
Coding tip
Code the most specific documented constipation type first; use K59.09 only when the record supports “other” or unspecified constipation.