Microgenia

This code describes an abnormally small chin or mandible, a condition also known as micrognathia. It refers to a congenital or acquired underdevelopment of the lower jaw, which can affect facial aesthetics, dental occlusion, and sometimes airway patency.

Use this code when documentation explicitly states "microgenia" or "micrognathia" as a diagnosis. This condition is often identified during physical examination, imaging studies (e.g., X-rays, CT scans), or as part of a syndrome.

• Differentiate from retrognathia (M26.21-), which describes a posterior positioning of the mandible, not necessarily a small size.
• Code any associated syndromes or congenital anomalies first, if applicable, as microgenia can be a feature of various genetic conditions.
• Ensure the documentation specifies the laterality if only one side of the mandible is affected, although microgenia is typically a bilateral condition.