Fissural cysts of jaw

This code represents non-odontogenic cysts that develop along embryonic fusion lines within the maxilla or mandible. These are developmental cysts, not inflammatory or infectious in origin, and are typically lined with epithelium. They can include nasopalatine duct cysts, globulomaxillary cysts, and median palatal cysts.

Use this code when documentation specifies a diagnosis of a fissural cyst located in the jaw, such as a nasopalatine cyst or a globulomaxillary cyst. This code is appropriate when the etiology is clearly developmental, arising from entrapped epithelial remnants during facial development. Supporting documentation should include imaging reports (e.g., panoramic X-ray, CT scan) and pathology reports confirming the diagnosis.

• Differentiate from odontogenic cysts (e.g., radicular, dentigerous), which arise from tooth-forming tissues.
• Ensure the documentation explicitly states "fissural" or specifies a type of cyst known to be fissural (e.g., nasopalatine).
• Do not use for cysts of inflammatory origin or those directly associated with teeth.