C11.0

Billable

Malignant neoplasm of superior wall of nasopharynx

HCC Category Mapping

V28HCC 21 — Breast, Prostate, Colorectal and Other Cancers and Tumors

0.545

V24HCC 11 — Colorectal, Bladder, and Other Cancers

0.306

ESRDHCC 11 — Colorectal, Bladder, and Other Cancers

0.000

What This Code Means

Cancer located in the upper wall of the nasopharynx, the uppermost part of the throat behind the nose.

Coding Tips

•The superior wall of the nasopharynx is the roof or top surface of the nasopharynx, near the base of the skull
•Distinguish from other nasopharyngeal sites such as lateral wall (C11.2), posterior wall (C11.3), or anterior wall (C11.3)

Clinical Significance

Malignant neoplasm of the superior wall of the nasopharynx involves cancer of the roof of the upper throat behind the nose, near the base of the skull. This is clinically significant because proximity to the skull base means early intracranial extension risk, and nasopharyngeal cancers are strongly associated with Epstein-Barr virus in endemic populations.

Documentation Requirements

✓Pathology-confirmed malignancy with histological type (nonkeratinizing carcinoma common in EBV-associated cases)
✓Specific documentation of superior wall or roof of nasopharynx as primary site
✓EBV serology and tumor EBV-encoded RNA (EBER) status
✓MRI assessment of skull base invasion
✓TNM staging per nasopharyngeal cancer-specific staging criteria

Commonly Confused Codes

C11.1 — Posterior wall of nasopharynx; the superior wall (roof) is distinct from the posterior (back) wall C11.2 — Lateral wall of nasopharynx; distinguish roof from side walls C11.8 — Overlapping sites of nasopharynx; use when tumor spans multiple nasopharyngeal walls C30.0 — Nasal cavity; nasopharyngeal tumors may extend anteriorly into the nasal cavity

Code Hierarchy

└C11Malignant neoplasm of nasopharynx └C11.0Malignant neoplasm of superior wall of nasopharynx

└C11.0Malignant neoplasm of superior wall of nasopharynx