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ICD-10-CM 2027 diagnosis code

N27.0Small kidney, unilateral

✓ Billable / specific

N27.0 is a valid, billable ICD-10-CM code for small kidney, unilateral. 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 N27.0

N27.0 is the ICD-10-CM diagnosis code for small kidney, unilateral. It belongs to category N27 (small kidney of unknown cause), block N25-N29 (other disorders of kidney and ureter) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N27 (small kidney of unknown cause), N27.0 is specifically for small kidney, unilateral. Related codes cover bilateral (N27.1) and unspecified (N27.9).

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 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), 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 589.0 (unilateral small kidney).

Notes that apply from higher levels

Instructions written at a parent level also apply to N27.0.

› From N27 Small kidney of unknown cause
Includes
  • oligonephronia

Broader instructions also apply from N25-N29 Other disorders of kidney and ureter and Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to N27.0.

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 →
  • 589.0Unilateral small kidneyexact

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 N27.0

Is N27.0 billable?

Yes. N27.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N27.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N27.0 as a principal diagnosis.

Is N27.0 a CC or MCC?

No. N27.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N27.0 group to?

N27.0 is used in the MS-DRG v44.0 logic for MS-DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC), MS-DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC) and MS-DRG 700 (Other Kidney and Urinary Tract Diagnoses 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 N27.0?

The CMS General Equivalence Mappings map N27.0 to ICD-9-CM 589.0.