Malignant neoplasm of ureter (C66) ICD-10-CM
The C66 code range covers malignant neoplasm of ureter with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
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.
- malignant neoplasm of ureteric orifice of bladder C67.6
Codes in the C66 Range 4 codes · 3 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C66 range.
Malignant Ureter Neoplasm
A primary or metastatic malignant tumor involving the ureter. The majority are carcinomas.
About the C66 Code Range
Cancer involving the ureter can start there or spread there from elsewhere.
C66 sits within urinary tract cancers. Its subdivisions identify the right ureter (C66.1), left ureter (C66.2), or an unspecified ureter (C66.9).
Questions About This Page
How many billable codes are in the C66 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the C66 range classify?
The range classifies malignant neoplasm of ureter. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
