Benign neoplasm of long bones of unspecified lower limb

This code signifies the presence of a non-malignant tumor originating in the long bones of a lower extremity, where the specific leg (right or left) is not documented. These benign growths are typically slow-growing and do not metastasize.

Apply this code when diagnostic imaging (e.g., X-ray, MRI) or biopsy confirms a benign neoplasm within a long bone of the lower limb, and the medical record does not specify laterality. This is appropriate for conditions like osteochondroma, enchondroma, or fibrous dysplasia affecting the femur, tibia, or fibula without malignant features.

• Ensure documentation explicitly states "benign neoplasm" and "long bone."
• Avoid using this code if laterality (right or left lower limb) is specified; use the more specific D16.21 or D16.22.
• Do not use for malignant neoplasms (C codes) or neoplasms of uncertain/unknown behavior (D48.0).