2026 ICD-10-CM Diagnosis Code C79.00Secondary malignant neoplasm of unspecified kidney and renal pelvis
ICD-10-CM Codes›C00–D49›C76-C80›C79
- Billable — Valid for Submission
- Chronic Condition
C79.00 is a billable ICD-10-CM diagnosis code for secondary malignant neoplasm of unspecified kidney and 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 Secondary malignancies.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma of renal pelvis
- Chromophobe renal cell carcinoma
- Cystadenocarcinoma of kidney
- Leukemic infiltrate of kidney
- Lymphoma of kidney
- Lymphomatous infiltrate of kidney
- Malignant melanoma metastatic to kidney
- Metastatic chromophobe renal cell carcinoma
- Metastatic cystadenocarcinoma to kidney
- Metastatic malignant neoplasm to kidney
- Metastatic malignant neoplasm to renal pelvis
- Metastatic MiT family translocation renal cell carcinoma
- Metastatic papillary cystadenocarcinoma to kidney
- Metastatic papillary renal cell carcinoma
- Metastatic renal cell carcinoma
- Metastatic small cell neuroendocrine carcinoma
- Metastatic transitional cell carcinoma to kidney
- Metastatic transitional cell carcinoma to renal pelvis
- Metastatic transitional cell carcinoma to upper urinary tract
- MiT family translocation renal cell carcinoma
- Papillary cystadenocarcinoma of kidney
- Papillary renal cell carcinoma
- Secondary adenocarcinoma of kidney
- Secondary undifferentiated large cell malignant neoplasm of kidney
- Small cell carcinoma metastatic to kidney
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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.Metastatic Chromophobe Renal Cell Carcinoma
a chromophobe renal cell carcinoma that has spread from the original site of growth to another anatomic site.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| calyx, renal | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| junction › pelviureteric | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.59 |
| kidney (parenchymal) | C64. | C79.0 | D09.19 | D30.0 | D41.0 | D49.51 |
| kidney (parenchymal) › calyx | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| kidney (parenchymal) › hilus | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| kidney (parenchymal) › pelvis | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| parenchyma, kidney | C64. | C79.0 | D09.19 | D30.0 | D41.0 | D49.51 |
| pelvis, pelvic › renal | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| renal | C64. | C79.0 | D09.19 | D30.0 | D41.0 | D49.51 |
| renal › calyx | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| renal › hilus | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
| renal › parenchyma | C64. | C79.0 | D09.19 | D30.0 | D41.0 | D49.51 |
| renal › pelvis | C65. | C79.0 | D09.19 | D30.1 | D41.1 | D49.51 |
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 C79.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C79.00Overview
Is C79.00 (Secondary malignant neoplasm of kidney and renal pelvis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report secondary malignant neoplasm of unspecified kidney and renal pelvis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C79.00 group to?
When secondary malignant neoplasm of unspecified kidney and 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 C79.00?
Under the General Equivalence Mappings, secondary malignant neoplasm of unspecified kidney and renal pelvis converts to ICD-9-CM 198.0 (second malig neo 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.
