C22.8
BillableMalignant neoplasm of liver, primary, unspecified as to type
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 9 — Lung and Other Severe Cancers
0.973ESRDHCC 9 — Lung and Other Severe Cancers
0.000RxHCCHCC 20 — Cancer, Liver and Intrahepatic Bile Duct
0.000What This Code Means
A primary liver cancer where the specific type or cell origin has not been determined or specified in the medical documentation.
Coding Tips
- •Use only when histological type is unknown or not documented
- •Query provider if pathology results are available to assign more specific code
Clinical Significance
Primary liver cancer, unspecified as to type, is used when there is confirmed primary malignancy of the liver but the specific histological type has not been determined. This may occur when biopsy has not been performed or pathology results are pending. While this code carries the same HCC weight as specified liver cancer codes, determining the specific type is critical for treatment decisions, as hepatocellular carcinoma, cholangiocarcinoma, and other types have fundamentally different management strategies.
Documentation Requirements
- ✓Confirmation that the cancer is primary to the liver (not metastatic)
- ✓Documentation that the specific histological type is unknown or not yet determined
- ✓Imaging characteristics suggesting primary liver malignancy
- ✓Alpha-fetoprotein and other tumor markers if obtained
- ✓Planned workup to determine specific type
Commonly Confused Codes
C22.0 — Hepatocellular carcinoma: use when hepatocellular type is confirmedC22.1 — Intrahepatic cholangiocarcinoma: use when bile duct carcinoma is confirmedC22.9 — Liver cancer, not specified as primary or secondary: C22.8 is for confirmed primary but unknown type; C22.9 is for unknown origin (primary vs secondary)C78.7 — Secondary malignant neoplasm of liver: metastatic liver cancer; must exclude this before using C22.8
Code Hierarchy
└C22Malignant neoplasm of liver and intrahepatic bile ducts└C22.8Malignant neoplasm of liver, primary, unspecified as to type
└C22.8Malignant neoplasm of liver, primary, unspecified as to type