2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Congenital Anomalies 740-759 > Cleft Palate And Cleft Lip 749.* > 2006 ICD-9-CM Diagnosis 749.1 Cleft lip View the most recent version of ICD-9-CM 749.1 Congenital defect in the upper lip where the maxillary prominence fails to merge with the merged medial nasal prominences. It is thought to be caused by faulty migration of the mesoderm in the head region. 749.1 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 749.* hierarchy Alternate Terminology Cheiloschisis Congenital fissure of lip Harelip Labium leporinum