2026 ICD-10-CM Diagnosis Code C66Malignant neoplasm of ureter
C66 is a non-billable ICD-10-CM category code for malignant neoplasm of ureter, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C66.1, C66.2, and C66.9.
Code Identity
Code Classification
Specific Coding for Malignant neoplasm of ureterOverview
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- malignant neoplasm of ureteric orifice of bladder C67.6
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
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Code HistoryHistory
Questions About C66Overview
Is C66 (Malignant neoplasm of ureter) a billable code?
No. This is a category header that groups the codes for malignant neoplasm of ureter, and headers cannot be submitted on claims. Claims for malignant neoplasm of ureter need a more specific code from this category, such as C66.1, C66.2, and C66.9.
