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    OpenPayerBilling CodesMalignant neoplasms of urinary tractICD-10-CM c64-malignant-neoplasm-of-kidney
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    ICD-10-CM Code For Malignant Neoplasm Of Kidney Except Renal Pelvis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C64 includes malignant neoplasms of the kidney excluding the renal pelvis, such as primary renal cell carcinomas and other malignant renal parenchymal tumors. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving primary malignant renal tumors, capturing tumor site, laterality, and related clinical complexity. Accurate coding within the ICD-10-CM C64 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM C64: Malignant Neoplasm Of Kidney, Except Renal Pelvis Overview

    This group includes malignant tumors originating in the renal parenchyma and cortex, excluding neoplasms of the renal pelvis. It targets cancers of the kidney that can affect renal function and may require surgical, medical, or radiation interventions. Accurate coding is important for reflecting disease severity and ensuring appropriate documentation that supports reimbursement.

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    When to Use

    Use a code from this group when a clinician documents a primary malignant tumor of the kidney and specifies laterality or other pertinent details. Codes in this group are applied for encounters that document diagnosis, treatment planning, or follow-up related to malignant renal tumors.

    ICD-10-CM Codes

    3 rows

    ICD-10-CM CodeDescription
    C64.1Malignant neoplasm of right kidney, except renal pelvis
    C64.2Malignant neoplasm of left kidney, except renal pelvis
    C64.9Malignant neoplasm of unspecified kidney, except renal pelvis

    DRG Codes

    6 rows

    DRG CodeDescription
    656Kidney and Ureter Procedures for Neoplasm with MCC
    657Kidney and Ureter Procedures for Neoplasm with CC
    658Kidney and Ureter Procedures for Neoplasm without CC/MCC
    686Kidney and Urinary Tract Neoplasms with MCC
    687Kidney and Urinary Tract Neoplasms with CC
    688Kidney and Urinary Tract Neoplasms without CC/MCC

    Typical Clinical Scenarios

    • An adult patient presents to the emergency department with acute flank pain, gross hematuria, and a palpable abdominal mass; imaging (CT abdomen/pelvis) shows a solid enhancing mass arising from the renal cortex without involvement of the renal pelvis. The presentation is acute and the workup is focused on diagnosing and staging a newly suspected primary renal malignancy, so a code from this group is assigned to capture the malignant neoplasm of the kidney. Typical codes: C64.9
    • A middle-aged patient with an incidental small renal mass discovered on abdominal imaging during evaluation of unrelated gastrointestinal symptoms returns for elective partial nephrectomy; pathology confirms a localized renal cell carcinoma confined to the kidney. This is a planned surgical encounter for a chronic/indolent primary kidney neoplasm, and a code from this group is used to report the confirmed malignant kidney tumor. Typical codes: C64.1, C64.9
    • An elderly patient with known metastatic renal malignancy presents for palliative care coordination after progression on systemic therapy, with worsening fatigue and anemia; the primary tumor in the kidney is the source of metastases. The clinical encounter documents the malignant kidney neoplasm as the underlying active cancer driving current management decisions, so a code from this group is reported as the primary diagnosis. Typical codes: C64.2, C64.9

    Related Codes

    C65-MALIGNANT-NEOPLASM-OF-RENAL-PELVIS

    ICD-10-CM Code For Malignant Neoplasm Of Renal Pelvis: Group Overview

    C66-MALIGNANT-NEOPLASM-OF-URETER

    ICD-10-CM Code For Malignant Neoplasm Of Ureter: Group Overview

    C67-MALIGNANT-NEOPLASM-OF-BLADDER

    ICD-10-CM Code For Malignant Neoplasm Of Bladder: Group Overview

    C68-MALIGNANT-NEOPLASM-URINARY-ORGANS

    ICD-10-CM Code For Malignant Neoplasm Of Other And Unspecified Urinary Organs: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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