C11.9
BillableMalignant neoplasm of nasopharynx, unspecified
HCC Category Mapping
V28HCC 21 — Breast, Prostate, Colorectal and Other Cancers and Tumors
0.545V24HCC 11 — Colorectal, Bladder, and Other Cancers
0.306ESRDHCC 11 — Colorectal, Bladder, and Other Cancers
0.000What This Code Means
Cancer of the nasopharynx when the specific location within this area is not documented or specified.
Coding Tips
- •Use this code only when the exact site (posterior, lateral, or anterior wall) cannot be determined from documentation
- •Query the provider if possible to obtain more specific anatomical location for accurate coding
Clinical Significance
Malignant neoplasm of nasopharynx, unspecified, is used when the specific nasopharyngeal wall cannot be determined. Given that modern MRI staging and endoscopy can typically identify the involved wall(s), this code should prompt review of imaging reports before assignment.
Documentation Requirements
- ✓Pathology confirmation of nasopharyngeal malignancy
- ✓Documentation of imaging review for wall-specific information
- ✓EBV status
- ✓Provider query documentation for specific anatomical detail
- ✓Complete staging and treatment information
Commonly Confused Codes
C11.1 — Posterior wall; the most common nasopharyngeal cancer site — check imagingC11.2 — Lateral wall; second most common site — check for Eustachian tube involvementC14.0 — Pharynx, unspecified; even less specific — at least C11.9 identifies the nasopharynxC11.8 — Overlapping sites; use when multiple walls are involved but identifiable