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ICD-10-CM 2027 diagnosis code

R93.421Abnormal radiologic findings on diagnostic imaging of right kidney

✓ Billable / specific

R93.421 is a valid, billable ICD-10-CM code for abnormal radiologic findings on diagnostic imaging of right kidney. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Abnormal radiologic findings on dx imaging of r kidney

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R93.421

R93.421 is the ICD-10-CM diagnosis code for abnormal radiologic findings on diagnostic imaging of right kidney. It belongs to category R93 (abnormal findings on diagnostic imaging of other body structures), block R90-R94 (abnormal findings on diagnostic imaging and in function studies, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R93.42 (abnormal radiologic findings on diagnostic imaging of kidney), R93.421 is specifically for abnormal radiologic findings on diagnostic imaging of right kidney. Related codes cover left kidney (R93.422) and unspecified kidney (R93.429).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 695 (Kidney and Urinary Tract Signs and Symptoms with MCC, relative weight 1.1139) and DRG 696 (Kidney and Urinary Tract Signs and Symptoms without MCC, relative weight 0.6679), 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 was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 793.5 (nonspecific (abnormal) findings on radiological and other examination of genitourinary organs).

Notes that apply from higher levels

Instructions written at a parent level also apply to R93.421.

› From R93.4 Abnormal findings on diagnostic imaging of urinary organs
Excludes2
  • hypertrophy of kidney (N28.81)

Broader instructions also apply from R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

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 →
  • 793.5Nonspecific (abnormal) findings on radiological and other examination of genitourinary organsapproximate

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
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about R93.421

Is R93.421 billable?

Yes. R93.421 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R93.421 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R93.421 as a principal diagnosis.

Is R93.421 a CC or MCC?

No. R93.421 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R93.421 group to?

R93.421 is used in the MS-DRG v44.0 logic for MS-DRG 695 (Kidney and Urinary Tract Signs and Symptoms with MCC) and MS-DRG 696 (Kidney and Urinary Tract Signs and Symptoms without 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 R93.421?

The CMS General Equivalence Mappings map R93.421 to ICD-9-CM 793.5.