C40
C40 — Malignant neoplasm of bone and articular cartilage of limbs
Non-billable headerICD-10-CM
C40 is a non-billable header ICD-10-CM code for malignant neoplasm of bone and articular cartilage of limbs. It cannot be billed on its own: choose one of the more specific child codes below.
Use additional code
Add a secondary code to capture the detail described below.
- code to identify major osseous defect, if applicable (M89.7-)
Other codes that can never be billed with C40
These codes carry an Excludes1 note pointing at C40. 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 alone.
Risk adjustment
C40 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 to one of these instead C40
6 child codes. Green means billable.
- 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
- C40.3Malignant neoplasm of short 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
- Is C40 a billable ICD-10-CM code?
- No. C40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C40 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of bone and articular cartilage (C40-C41).