Echinococcus granulosus infection of bone

This code signifies a parasitic infection caused by the larval stage of the tapeworm Echinococcus granulosus, specifically when the hydatid cysts are located within bone tissue. This condition, also known as osseous hydatid disease, results from the hematogenous dissemination of oncospheres, leading to lytic bone lesions and potential pathological fractures.

Use this code for patients diagnosed with hydatid disease where imaging (X-ray, CT, MRI) or biopsy confirms the presence of Echinococcus granulosus cysts within any bone. Documentation should clearly state the bone involvement and the causative organism. This code is appropriate for both primary bone involvement and metastatic osseous lesions from a primary echinococcal infection elsewhere.

• Ensure documentation specifies bone involvement; otherwise, a more general echinococcosis code may be appropriate.
• Do not confuse with other parasitic bone infections or non-parasitic bone cysts.
• Sequence this code as the primary diagnosis when the bone infection is the reason for the encounter.