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ICD-10-CM 2027 diagnosis code

C64.1Malignant neoplasm of right kidney, except renal pelvis

✓ Billable / specificCC — complication/comorbidity

C64.1 is a valid, billable ICD-10-CM code for malignant neoplasm of right kidney, except renal pelvis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C64.1

C64.1 is the ICD-10-CM diagnosis code for malignant neoplasm of right kidney, except renal pelvis. It belongs to category C64 (malignant neoplasm of kidney, except renal pelvis), block C64-C68 (malignant neoplasms of urinary tract) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C64 (malignant neoplasm of kidney, except renal pelvis), C64.1 is specifically for malignant neoplasm of right kidney, except renal pelvis. Related codes cover left kidney, except renal pelvis (C64.2) and unspecified kidney, except renal pelvis (C64.9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 656 (Kidney and Ureter Procedures for Neoplasm with MCC, relative weight 3.2786), DRG 657 (Kidney and Ureter Procedures for Neoplasm with CC, relative weight 1.8365), DRG 658 (Kidney and Ureter Procedures for Neoplasm without CC/MCC, relative weight 1.538), DRG 686 (Kidney and Urinary Tract Neoplasms with MCC, relative weight 1.7237), DRG 687 (Kidney and Urinary Tract Neoplasms with CC, relative weight 0.9957) and DRG 688 (Kidney and Urinary Tract Neoplasms without CC/MCC, relative weight 0.7333), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 189.0 (malignant neoplasm of kidney, except pelvis).

Notes that apply from higher levels

Instructions written at a parent level also apply to C64.1.

› From C64 Malignant neoplasm of kidney, except renal pelvis
Excludes1
  • malignant carcinoid tumor of the kidney (C7A.093)
  • malignant neoplasm of renal calyces (C65.-)
  • malignant neoplasm of renal pelvis (C65.-)

Broader instructions also apply from Chapter 2: Neoplasms.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 189.0Malignant neoplasm of kidney, except pelvisapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C64.1

Is C64.1 billable?

Yes. C64.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C64.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C64.1 as a principal diagnosis.

Is C64.1 a CC or MCC?

C64.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does C64.1 group to?

C64.1 is used in the MS-DRG v44.0 logic for MS-DRG 656 (Kidney and Ureter Procedures for Neoplasm with MCC), MS-DRG 657 (Kidney and Ureter Procedures for Neoplasm with CC), MS-DRG 658 (Kidney and Ureter Procedures for Neoplasm without CC/MCC), MS-DRG 686 (Kidney and Urinary Tract Neoplasms with MCC), MS-DRG 687 (Kidney and Urinary Tract Neoplasms with CC) and MS-DRG 688 (Kidney and Urinary Tract Neoplasms without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for C64.1?

The CMS General Equivalence Mappings map C64.1 to ICD-9-CM 189.0.