All ICD10 Codes

N27

Non-Billable
ChapterN00–N99
Rankcategory
Official Description

Small kidney of unknown cause

Use a more specific code (3 billable)
N27.0Small kidney, unilateralN27.1Small kidney, bilateralN27.9Small kidney, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 14: Diseases of the Genitourinary System (N00-N99).

CH14 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

N25-N29 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • disorders of kidney and ureter with urolithiasis (N20-N23)

Instructional Notes

Includes
  • oligonephronia

Clinical Hierarchy

BillableHas subcodes
CH14Diseases of the genitourinary system (N00-N99)
N25-N29Other disorders of kidney and ureter (N25-N29)
N27Small kidney of unknown causeNot billable
N27.0Small kidney, unilateralBillable
N27.1Small kidney, bilateralBillable
N27.9Small kidney, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N27:

blockN25-N29
Other disorders of kidney and ureter (N25-N29)
View context instructions
chapterCH14
Diseases of the genitourinary system (N00-N99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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