ICD-10 Code D48.0 – Neoplasm of uncertain behavior of bone and articular cartilage (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D48.0 – Neoplasm of uncertain behavior of bone and articular cartilage
What it is
D48.0 identifies a bone or articular cartilage tumor whose behavior is uncertain. Use it when pathology or clinical documentation shows a neoplasm that cannot yet be classified as clearly benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Patients may have localized pain, swelling, or an incidental imaging finding, but the key point is that the lesion’s biologic behavior remains uncertain.
When to use this code
Use this code when the provider documents an uncertain behavior neoplasm arising in bone or articular cartilage, including cases awaiting definitive classification. It also fits when the pathology report states “uncertain behavior” or similar wording and no more specific diagnosis is available. Check documentation if the site or behavior is unclear.
Do not use for
Do not use D48.0 for clearly benign tumors, primary malignant bone tumors, or metastatic disease. If the record supports a different behavior code or a more specific diagnosis, code that instead.
Coding tip
Verify both the anatomic site and the “uncertain behavior” wording before assigning D48.0.