Radicular cyst

This code identifies a radicular cyst, also known as a periapical cyst or dental cyst, which is an inflammatory odontogenic cyst arising from epithelial remnants in the periodontal ligament as a consequence of pulpal necrosis and infection. It typically develops at the apex of a non-vital tooth.

Use this code when documentation clearly indicates the presence of a radicular cyst, often diagnosed via radiographic imaging (e.g., periapical radiographs, panoramic X-rays) showing a well-defined radiolucency associated with the apex of a tooth. Supporting clinical notes should describe symptoms such as pain, swelling, or asymptomatic findings during routine dental examination.

• Differentiate from other odontogenic cysts like follicular cysts or keratocystic odontogenic tumors, which have distinct origins and ICD-9 codes.
• Ensure the documentation specifies "radicular" or "periapical" to support this specific diagnosis.
• Consider additional codes for the underlying cause, such as pulpal necrosis (e.g., 522.4) or periapical abscess (e.g., 522.5), if present and documented.