2026 ICD-10-CM Diagnosis Code C64.1Malignant neoplasm of right kidney, except renal pelvis

ICD-10-CM Codes›C00–D49›C64-C68›C64

ICD-10-CM C64.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C64.1 is a billable ICD-10-CM diagnosis code for malignant neoplasm of right kidney, except renal pelvis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 656 through 658, 686 through 688. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Urinary system cancers - kidney.

Code Identity

ICD-10-CM Code
C64.1
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of right kidney, except renal pelvis
Short Description
Malignant neoplasm of right kidney, except renal pelvis
Same as the full description in the CMS dataset.
Parent Code
C64
Malignant neoplasm of kidney, except renal pelvis

Code Classification

ChapterC00–D49Neoplasms
SectionC64-C68Malignant neoplasms of urinary tract
CategoryC64Malignant neoplasm of kidney, except renal pelvis
This CodeC64.1Malignant neoplasm of right kidney, except renal pelvis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral neoplasm of kidneys
  • Bilateral primary malignant neoplasm of kidneys
  • Clear cell carcinoma of right kidney
  • Nephroblastoma
  • Nephroblastoma of right kidney
  • Primary leiomyosarcoma of abdomen
  • Primary leiomyosarcoma of retroperitoneum
  • Primary leiomyosarcoma of right kidney
  • Primary malignant neoplasm of left kidney
  • Primary malignant neoplasm of right kidney
  • Primary nephroblastoma
  • Primary nephroblastoma of right kidney
  • Primary renal cell carcinoma of right kidney
  • Primary sarcoma of retroperitoneum
  • Primary sarcoma of right kidney
  • Primary transitional cell carcinoma of kidney
  • Primary transitional cell carcinoma of right kidney
  • Renal cell carcinoma of bilateral kidneys
  • Sarcoma of kidney
  • Transitional cell carcinoma of right kidney

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO045
Urinary system cancers - kidney
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Kidney Cancer

You have two kidneys. They are fist-sized organs on either side of your backbone above your waist. The tubes inside filter and clean your blood, taking out waste products and making urine. Kidney cancer forms in the lining of tiny tubes inside your kidneys.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert C64.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
189.0 Malig neopl kidney
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C64.1Overview

Is C64.1 (Malignant neoplasm of kidney, except renal pelvis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of right kidney, except renal pelvis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C64.1 group to?

When malignant neoplasm of right kidney, except renal pelvis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 656, 657, 658, 686, 687, 688, with relative weights from 0.7903 to 3.1838 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C64.1?

Under the General Equivalence Mappings, malignant neoplasm of right kidney, except renal pelvis converts to ICD-9-CM 189.0 (malig neopl kidney). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.