ICD-10-CM > N00-N99 > N25-N29 > N26 N26 Unspecified contracted kidney Non-Billable/Non-Specific Type 1 Excludes contracted kidney due to hypertension (I12.-)diffuse sclerosing glomerulonephritis (N05.8.-)hypertensive nephrosclerosis (arteriolar) (arteriosclerotic) (I12.-)small kidney of unknown cause (N27.-) Codes N26.1Atrophy of kidney (terminal)N26.2Page kidneyN26.9Renal sclerosis, unspecified