C49.9
BillableMalignant neoplasm of connective and soft tissue, unspecified
HCC Category Mapping
V28HCC 21 — Breast, Prostate, Colorectal and Other Cancers and Tumors
0.545V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 22 — Cancer, Other Specified Sites
0.000What This Code Means
A malignant tumor of connective and soft tissue when the specific anatomical location is not documented or cannot be determined.
Coding Tips
- •This is the least specific code in the C49 category; attempt to obtain site information from imaging or pathology reports
- •Query the provider for anatomical location to assign a more specific code if possible
Clinical Significance
Malignant neoplasm of connective and soft tissue, unspecified is the least specific soft tissue sarcoma code. Its use should be a last resort and trigger a documentation improvement initiative, as the anatomical site is almost always determinable from imaging, pathology, or operative reports.
Documentation Requirements
- ✓Pathology confirming malignant soft tissue neoplasm
- ✓Evidence that site-specific information was sought but unavailable
- ✓Provider query documentation for anatomical specification
- ✓Treatment status despite unknown primary site
- ✓Oncology consultation notes that may contain site information
Commonly Confused Codes
C49.0-C49.5 (Site-specific soft tissue codes) — always preferred when site is documentedC49.8 (Overlapping sites) — for tumors spanning multiple known sitesC80.1 (Malignant neoplasm, unspecified) — even less specific; at least C49.9 identifies soft tissue originC49.6 (Trunk, unspecified) — slightly more specific if trunk involvement is known