N26 Unspecified contracted kidney

Not billable (header)Chapter 14

Report one of the more specific codes below.

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Codes under this one

N26.1 Atrophy of kidney (terminal)
N26.2 Page kidney
N26.9 Renal sclerosis, unspecified

Instructional notes

Chapter 14

Excludes2Not included here: the patient may have both; report both when both are present.

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)

Section N25-N29

Excludes2Not included here: the patient may have both; report both when both are present.

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

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

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

Chapter 14: Diseases of the genitourinary system · N25-N29 Other disorders of kidney and ureter (N25-N29)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.