C40.3 — Malignant neoplasm of short bones of lower limb
C40.3 is a non-billable header ICD-10-CM code for malignant neoplasm of short bones of lower limb. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with C40.3
These codes carry an Excludes1 note pointing at C40.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C40.3 alone.
- C41Malignant neoplasm of bone and articular cartilage of other and unspecified sites
Risk adjustment
C40.3 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code history
C40.3 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead C40.3
3 child codes. Green means billable.
Related codes at this level
Codes that share C40. If C40.3 is not quite right, the correct code is usually one of these.
- C40.0Malignant neoplasm of scapula and long bones of upper limb
- C40.1Malignant neoplasm of short bones of upper limb
- C40.2Malignant neoplasm of long bones of lower limb
- C40.8Malignant neoplasm of overlapping sites of bone and articular cartilage of limb
- C40.9Malignant neoplasm of unspecified bones and articular cartilage of limb
Questions about C40.3
- Is C40.3 a billable ICD-10-CM code?
- No. C40.3 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C40.3 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of bone and articular cartilage (C40-C41).