N26

Non-Billable

ChapterN00–N99

Rankcategory

Official Description

Unspecified contracted kidney

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

Excludes1(Not coded here)

contracted kidney due to hypertension (I12.-)
diffuse sclerosing glomerulonephritis (N05.8.-)
hypertensive nephrosclerosis (arteriolar) (arteriosclerotic) (I12.-)
small kidney of unknown cause (N27.-)

Clinical Hierarchy

CH14Diseases of the genitourinary system (N00-N99)

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

N26Unspecified contracted kidney

N26.1Atrophy of kidney (terminal)

N26.2Page kidney

N26.9Renal sclerosis, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N26:

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 N26. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

8 raw paths

Atrophy, atrophic (of)2 unique routes

kidney (senile) (terminal)→N26

renal→N26

Contraction (s), contracture, contracted2 unique routes

kidney (granular) (secondary)→N26(2 variants)

Page→N26

Fibrosis, fibrotic1 unique routes

kidney→N26

Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)1 unique routes

cirrhotic→N26

Nephrosclerosis (arteriolar)(arteriosclerotic) (chronic) (hyaline)1 unique routes