Is C66.9 a billable ICD-10 code?

Yes. C66.9 (Malignant neoplasm of unspecified ureter) is billable and can be used for insurance claims. Always verify payer-specific requirements.

C66.9 ✓ Billable

Malignant neoplasm of unspecified ureter

Q: What is ICD-10 code C66.9?

ICD-10-CM code C66.9 stands for "Malignant neoplasm of unspecified ureter". It is a billable code in the Neoplasms chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Neoplasms

Code

C66.9

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Neoplasms

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code C66.9?

ICD-10-CM code C66.9 represents Malignant neoplasm of unspecified ureter. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.

Is C66.9 billable?

Yes. C66.9 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is C66.9 in?

C66.9 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.

Related codes in the C66 category

C66 Malignant neoplasm of ureter Non-billable C66.1 Malignant neoplasm of right ureter Billable C66.2 Malignant neoplasm of left ureter Billable

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