C66 – Malignant neoplasm of ureter
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of urinary tract
ICD-10-CM code
C66
- Code
C66(claims format:C66)- Description
- Malignant neoplasm of ureter
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C64-C68 Malignant neoplasms of urinary tract
Billable codes under C66
C66 is a header code and cannot be used on claims. Choose the most specific code:
Notes for C66
Excludes1 (not coded here):
- malignant neoplasm of ureteric orifice of bladder (C67.6)
Frequently asked questions
What is ICD-10 code C66?
C66 is the ICD-10-CM code for malignant neoplasm of ureter, in the block C64-C68 (Malignant neoplasms of urinary tract).
Is C66 a billable code?
No. C66 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.