C66 ICD-10-CM Code: Malignant neoplasm of ureter
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
C66Malignant neoplasm of ureter
ICD-10-CM diagnosis code · United States clinical modification
Where C66 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of urinary tract (C64-C68)
- 3
Category C66
Malignant neoplasm of ureter
- 4
Code C66
Malignant neoplasm of ureter
Codes under C66
C66 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for C66.
Code first
No “code first” instruction is listed for C66.
Use additional code
No “use additional code” instruction is listed for C66.
Excludes1
Conditions that should not be reported together with this code.
- malignant neoplasm of ureteric orifice of bladder (C67.6)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for C66.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code C66 mean?
C66 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of ureter.”
Is C66 a billable or specific ICD-10-CM code?
No. C66 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is C66 located in ICD-10-CM?
C66 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of urinary tract (C64-C68) (C64–C68), under category C66, Malignant neoplasm of ureter.
What coding notes are listed for C66?
No inclusion terms are listed for C66 in this reference record. No code-first instruction is listed. Excludes1 notes: malignant neoplasm of ureteric orifice of bladder (C67.6). No Excludes2 note is listed.