ICD-10 Code C40.10 – Malignant neoplasm of short bones of unspecified upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C40.10 – Malignant neoplasm of short bones of unspecified upper limb
What it is
This code identifies a malignant tumor arising in a short bone of the upper limb when the exact side is not documented. Use it for cancers involving bones such as the hand or wrist area when records do not specify left or right.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include localized bone pain, swelling, a palpable mass, or imaging evidence of an aggressive bone lesion.
When to use this code
Use C40.10 when the provider documents a primary malignant neoplasm of a short bone in the upper limb and laterality is not stated. It may also fit when pathology or imaging confirms the site, but the record does not identify left or right. Check documentation if the lesion is metastatic or from another primary site.
Do not use for
Do not use this code for benign bone tumors, metastatic disease to the upper limb, or malignancies in long bones or other skeletal sites. If the chart specifies laterality, use the more specific code.
Coding tip
Verify whether the tumor is primary and whether laterality is documented before assigning this unspecified code.