ICD-10 Code C40.92 – Malignant neoplasm of unspecified bones and articular cartilage of left limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C40.92 – Malignant neoplasm of unspecified bones and articular cartilage of left limb
What it is
C40.92 identifies a malignant tumor arising in the bones or articular cartilage of the left limb when the exact site is not specified. Use it when the record confirms a primary bone or cartilage cancer, but not a more precise location.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include persistent localized pain, swelling, reduced mobility, or an imaging or biopsy report confirming malignancy in the left limb.
When to use this code
Use this code when the provider documents a primary malignant neoplasm of an unspecified bone or articular cartilage in the left limb and does not name a more specific bone or joint site. It also fits when laterality is clear, but the anatomic detail remains unspecified. Check documentation if the record only says “bone cancer” without site or side.
Do not use for
Do not use it for metastatic bone disease, benign bone tumors, or malignant neoplasms with a more specific bone or joint site. If the tumor is in the right limb, or the exact bone is identified, choose the more specific code.
Coding tip
Verify both laterality and whether the neoplasm is primary before assigning C40.92.