constipation icd 10: Constipation is a common gastrointestinal issue characterised by infrequent or difficult bowel movements. In medical coding, the International Classification of Diseases, Tenth Revision (ICD-10), provides a specific code to identify and classify this condition. The relevant ICD-10 code for constipation is K59.00, which denotes unspecified constipation. This coding system is essential for accurate medical billing, record-keeping, and statistical purposes, allowing healthcare professionals to effectively diagnose and treat constipation.