N27

Non-Billable

ChapterN00–N99

Rankcategory

Official Description

Small kidney of unknown cause

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 14: Diseases of the Genitourinary System (N00-N99).

CH14 Parent Instructions

Excludes2(Not included here)

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)

disorders of kidney and ureter with urolithiasis (N20-N23)

Instructional Notes

Includes

oligonephronia

Clinical Hierarchy

CH14Diseases of the genitourinary system (N00-N99)

N25-N29Other disorders of kidney and ureter (N25-N29)

N27Small kidney of unknown cause

N27.0Small kidney, unilateral

N27.1Small kidney, bilateral

N27.9Small kidney, unspecified

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

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to N27. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

3 raw paths

Small (ness)3 unique routes

kidney (unknown cause)→N27(3 variants)

bilateral→N27

unilateral→N27

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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