C40.30 (Malignant neoplasm of short bones of unspecified lower limb) compared with C40.31 (Malignant neoplasm of short bones of right lower limb), from the official CMS tabular data. C40.30 and C40.31 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. C40.30 and C40.31 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| C40.30Malignant neoplasm of short bones of unspecified lower limb | C40.31Malignant neoplasm of short bones of right lower limb | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of short bones of unspecified lower limb is a billable ICD-10-CM diagnosis code (C40.30). | Malignant neoplasm of short bones of right lower limb is a billable ICD-10-CM diagnosis code (C40.31). |
| Includes | malignant neoplasm of cartilage (articular) (joint) malignant neoplasm of periosteum | malignant neoplasm of cartilage (articular) (joint) malignant neoplasm of periosteum |
| Use additional code | code to identify major osseous defect, if applicable (M89.7-) | code to identify major osseous defect, if applicable (M89.7-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources