ICD-10 Code K59.03 – Drug induced constipation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.03 – Drug induced constipation
What it is
K59.03 identifies constipation caused by a medication or other drug effect. Use it when the record clearly links the bowel problem to a prescribed or taken substance.
Clinical signs
Typical findings include infrequent bowel movements, hard stools, straining, bloating, or a sense of incomplete evacuation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents constipation as drug induced, medication related, or due to a specific therapeutic agent. It is appropriate when the causal relationship is stated in the assessment, discharge summary, or problem list.
Code the underlying drug effect when the note supports it, and confirm whether the medication is prescribed, over-the-counter, or a substance exposure. If the cause is unclear, check documentation before assigning K59.03.
Do not use for
Do not use K59.03 for constipation without a documented drug cause, or for constipation from dehydration, obstruction, or other non-drug causes. Check documentation.
Coding tip
Look for explicit wording such as “due to,” “secondary to,” or “medication-induced” before assigning K59.03.