C79.10

Billable

Secondary malignant neoplasm of unspecified urinary organs

HCC Category Mapping

V28HCC 18 — Metastatic Cancer to Peritoneum and Other Specified Sites

0.368

V24HCC 8 — Metastatic Cancer and Acute Leukemia

2.484

ESRDHCC 8 — Metastatic Cancer and Acute Leukemia

0.000

RxHCCHCC 18 — Metastatic Cancer to Lung and Other Respiratory Sites

0.000

What This Code Means

Cancer that has spread to the urinary system (kidneys, ureters, bladder, or urethra) but the specific organ location is not specified.

Coding Tips

•Use this code only when the specific urinary organ site cannot be determined; if location is known, use more specific codes (C79.01-C79.02 for kidney, C79.11 for bladder)
•Always query the provider if documentation suggests a specific urinary organ site to allow for more precise coding

Clinical Significance

Secondary malignant neoplasm of unspecified urinary organs indicates metastatic cancer has spread to the urinary system but the specific organ (kidney, bladder, ureter, urethra) is not identified. This code reflects incomplete documentation and should trigger a provider query to identify the specific urinary organ involved for more precise coding.

Documentation Requirements

✓Primary cancer site documented and coded separately
✓Best available description of which urinary organ is involved
✓Provider query documenting attempt to clarify the specific urinary organ
✓Imaging or cystoscopic findings that may localize the metastatic site
✓Urinary symptoms — hematuria, obstruction, frequency changes

Commonly Confused Codes

C79.00-C79.02 — Secondary malignant neoplasm of kidney; use kidney-specific codes when kidney is the documented site C79.11 — Secondary malignant neoplasm of bladder; use when bladder is specifically involved C79.19 — Secondary malignant neoplasm of other urinary organs; use when a specific non-kidney, non-bladder urinary organ is identified C68.0-C68.9 — Primary malignant neoplasm of other urinary organs; distinguish primary from secondary

Code Hierarchy

└C79Secondary malignant neoplasm of other and unspecified sites └C79.1Secondary malignant neoplasm of bladder and other and unspecified urinary organs └C79.10Secondary malignant neoplasm of unspecified urinary organs

└C79.10Secondary malignant neoplasm of unspecified urinary organs