C49.4
BillableMalignant neoplasm of connective and soft tissue of abdomen
HCC Category Mapping
V28HCC 23 — Melanoma and Other Skin Cancers
0.251V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 20 — Cancer, Liver and Intrahepatic Bile Duct
0.000What This Code Means
A malignant (cancerous) tumor that develops in the soft tissues or connective tissues of the abdominal wall or cavity, such as muscles, fat, or fibrous tissue.
Coding Tips
- •This code is for soft tissue sarcomas of the abdomen; ensure the tumor is in soft tissue, not in abdominal organs
- •Document whether the tumor is in the abdominal wall or deeper abdominal structures for clinical context
Clinical Significance
Malignant neoplasm of connective and soft tissue of the abdomen includes sarcomas of the abdominal wall musculature and soft tissues. These must be carefully distinguished from retroperitoneal sarcomas (C48.0) and intra-abdominal organ malignancies, as the treatment approach and HCC impact differ significantly.
Documentation Requirements
- ✓Pathology confirming malignant soft tissue neoplasm of the abdominal wall or abdominal soft tissue
- ✓Specific location (anterior wall, flank, abdominal musculature)
- ✓Distinction from retroperitoneal tumors (C48.0) and intra-abdominal organ tumors
- ✓Histological subtype and tumor grade
- ✓Imaging confirming abdominal wall or soft tissue origin rather than visceral origin
Commonly Confused Codes
C48.0 (Malignant neoplasm of retroperitoneum) — retroperitoneal tumors, not abdominal wall; note C48.0 maps to HCC 9 with much higher RAFC47.4 (Peripheral nerves of abdomen) — nerve-origin abdominal tumorC49.A_ (Gastrointestinal stromal tumors) — GIST is a distinct tumor typeD21.4 (Benign neoplasm of connective/soft tissue of abdomen) — benign counterpart
Code Hierarchy
└C49Malignant neoplasm of other connective and soft tissue└C49.4Malignant neoplasm of connective and soft tissue of abdomen
└C49.4Malignant neoplasm of connective and soft tissue of abdomen