2026 ICD-10-CM Diagnosis Code C64.9Malignant neoplasm of unspecified kidney, except renal pelvis

ICD-10-CM Codes›C00–D49›C64-C68›C64

ICD-10-CM C64.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C64.9 is a billable ICD-10-CM diagnosis code for malignant neoplasm of unspecified 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
C64.9
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of unspecified kidney, except renal pelvis
Short Description
Malignant neoplasm of unsp kidney, except renal pelvis
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 CodeC64.9Malignant neoplasm of unspecified kidney, except renal pelvis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • 11p partial monosomy syndrome
  • Acquired cystic disease associated renal cell carcinoma
  • Adrenal gland involved by direct invasion of renal tumor
  • Chromophobe renal cell carcinoma
  • Clear cell carcinoma of kidney
  • Clear cell papillary renal cell carcinoma
  • Clear cell sarcoma of kidney
  • Collecting duct carcinoma of kidney
  • Cutaneous leiomyoma
  • Cystadenocarcinoma of kidney
  • Cystic partially differentiated nephroblastoma of kidney
  • Cystic renal cell carcinoma of kidney
  • Deletion of part of chromosome 11
  • Familial renal cell carcinoma
  • Global developmental delay, lung cysts, overgrowth, Wilms tumor syndrome
  • Hereditary leiomyomatosis and renal cell carcinoma
  • Hereditary papillary renal cell carcinoma
  • Hereditary primary clear cell renal cell carcinoma
  • Local recurrence of malignant neoplasm of kidney
  • Malignant cystic nephroma
  • Malignant granular cell tumor
  • Malignant neoplasm of kidney
  • Malignant neoplasm of kidney parenchyma
  • Metastatic chromophobe renal cell carcinoma
  • Metastatic clear cell renal cell carcinoma
  • Metastatic collecting duct renal cell carcinoma
  • Metastatic cystic renal cell carcinoma
  • Metastatic MiT family translocation renal cell carcinoma
  • Metastatic papillary renal cell carcinoma
  • Metastatic renal cell carcinoma
  • MiT family translocation renal cell carcinoma
  • Mucinous tubular and spindle cell renal carcinoma
  • National Wilms Tumor Study Group Stage finding
  • National Wilms Tumor Study Group Stage I
  • National Wilms Tumor Study Group Stage II
  • National Wilms Tumor Study Group Stage III
  • National Wilms Tumor Study Group Stage IV
  • National Wilms Tumor Study Group Stage V
  • Nephroblastoma
  • Papillary cystadenocarcinoma of kidney
  • Papillary renal cell carcinoma
  • Primary chromophobe renal cell carcinoma
  • Primary clear cell carcinoma of kidney
  • Primary clear cell sarcoma of kidney
  • Primary collecting duct carcinoma of kidney
  • Primary cystadenocarcinoma of kidney
  • Primary cystic renal cell carcinoma of kidney
  • Primary malignant granular cell tumor
  • Primary malignant neoplasm of kidney
  • Primary MiT family translocation renal cell carcinoma
  • Primary mucinous tubular and spindle cell renal carcinoma
  • Primary nephroblastoma
  • Primary papillary cystadenocarcinoma of kidney
  • Primary papillary renal cell carcinoma
  • Primary renal cell carcinoma
  • Primary renal granular cell carcinoma
  • Primary renal medullary carcinoma
  • Primary sarcoma of retroperitoneum
  • Primary transitional cell carcinoma of kidney
  • Primary tubulocystic renal cell carcinoma
  • Renal cell carcinoma
  • Renal cell carcinoma of kidney except renal pelvis
  • Renal granular cell carcinoma
  • Renal medullary carcinoma
  • Renal tumor extends beyond Gerota's fascia macroscopically
  • Renal tumor extends into major vein macroscopically
  • Renal tumor finding
  • Renal tumor invades renal vein macroscopically
  • Renal tumor invasion into adrenal gland macroscopically
  • Renal tumor invasion into perinephric tissue macroscopically
  • Sarcoma of kidney
  • Transitional cell carcinoma of kidney
  • Tubulocystic renal cell carcinoma
  • WAGR syndrome

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

Clinical InformationClinical

  • WAGR Syndrome

    a contiguous gene syndrome associated with hemizygous deletions of chromosome region 11p13. the condition is marked by the combination of wilms tumor; aniridia; genitourinary abnormalities; and intellectual disability.

  • Metastatic Chromophobe Renal Cell Carcinoma

    a chromophobe renal cell carcinoma that has spread from the original site of growth to another anatomic site.

  • Metastatic Clear Cell Renal Cell Carcinoma

    a clear cell renal cell carcinoma that has spread from its original site of growth to other anatomic sites.

  • Metastatic Chromophobe Renal Cell Carcinoma

    chromophobe renal cell carcinoma that has spread from the original site of growth to another anatomic site.

  • Metastatic Papillary Renal Cell Carcinoma

    a papillary renal cell carcinoma that has spread from the original site of growth to another anatomic site.

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 C64.9 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 C64.9Overview

Is C64.9 (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 unspecified kidney, except renal pelvis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C64.9 group to?

When malignant neoplasm of unspecified 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 C64.9?

Under the General Equivalence Mappings, malignant neoplasm of unspecified 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.