Enchondromatosis

Enchondromatosis, also known as Ollier's disease, is a rare, non-hereditary skeletal disorder characterized by the development of multiple enchondromas (benign cartilaginous tumors) primarily affecting the metaphyses and diaphyses of long bones, especially in the hands and feet. These lesions can lead to bone deformities, limb length discrepancies, and pathological fractures.

Assign this code for patients diagnosed with enchondromatosis, whether localized or generalized. Documentation should clearly state the diagnosis of Ollier's disease or enchondromatosis, often supported by imaging findings (e.g., radiographs showing multiple lucent lesions within bones) and clinical presentation.

• Do not confuse with solitary enchondroma (D16.9); this code is specifically for multiple lesions.
• Code any associated pathological fractures separately, linking them to the underlying enchondromatosis.
• Consider laterality if specified in the documentation, though enchondromatosis is often diffuse.