C40-C41 — Malignant neoplasms of bone and articular cartilage
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.
Codes in range
24
No clinical group
6
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
18 of the 24 codes in C40-C41 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. A further 6 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Every code in C40-C41
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| C4000 | Malig neoplasm of scapula and long bones of unsp upper limb | None | Cannot group |
| C4001 | Malig neoplasm of scapula and long bones of right upper limb | K | Accepted |
| C4002 | Malig neoplasm of scapula and long bones of left upper limb | K | Accepted |
| C4010 | Malignant neoplasm of short bones of unspecified upper limb | None | Cannot group |
| C4011 | Malignant neoplasm of short bones of right upper limb | K | Accepted |
| C4012 | Malignant neoplasm of short bones of left upper limb | K | Accepted |
| C4020 | Malignant neoplasm of long bones of unspecified lower limb | None | Cannot group |
| C4021 | Malignant neoplasm of long bones of right lower limb | K | Accepted |
| C4022 | Malignant neoplasm of long bones of left lower limb | K | Accepted |
| C4030 | Malignant neoplasm of short bones of unspecified lower limb | None | Cannot group |
| C4031 | Malignant neoplasm of short bones of right lower limb | K | Accepted |
| C4032 | Malignant neoplasm of short bones of left lower limb | K | Accepted |
| C4080 | Malig neoplm of ovrlp sites of bone/artic cartl of unsp limb | None | Cannot group |
| C4081 | Malig neoplm of ovrlp sites of bone/artic cartl of r limb | K | Accepted |
| C4082 | Malig neoplm of ovrlp sites of bone/artic cartl of left limb | K | Accepted |
| C4090 | Malig neoplasm of unsp bones and artic cartlg of unsp limb | None | Cannot group |
| C4091 | Malig neoplasm of unsp bones and artic cartlg of right limb | K | Accepted |
| C4092 | Malig neoplasm of unsp bones and artic cartlg of left limb | K | Accepted |
| C410 | Malignant neoplasm of bones of skull and face | K | Accepted |
| C411 | Malignant neoplasm of mandible | K | Accepted |
| C412 | Malignant neoplasm of vertebral column | K | Accepted |
| C413 | Malignant neoplasm of ribs, sternum and clavicle | K | Accepted |
| C414 | Malignant neoplasm of pelvic bones, sacrum and coccyx | K | Accepted |
| C419 | Malignant neoplasm of bone and articular cartilage, unsp | K | Accepted |
Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff.