ICD-10-CM 2027
ICD-10 code for renal atrophy
From the official ICD-10-CM alphabetic index entry “Atrophy, atrophic (of) › renal”. Page updated September 29, 2026.
About coding renal atrophy
The ICD-10-CM code for renal atrophy is N26.1 (Atrophy of kidney (terminal)).
Within N26 (unspecified contracted kidney), N26.1 is specifically for atrophy of kidney (terminal). Related codes cover Page kidney (N26.2) and renal sclerosis, unspecified (N26.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about renal atrophy ICD-10 codes
What is the ICD-10 code for renal atrophy?
- N26.1 — Atrophy of kidney (terminal).
Is N26.1 billable?
- Yes. N26.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N26.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N26.1 as a principal diagnosis.
Is N26.1 a CC or MCC?
- No. N26.1 is neither a CC nor an MCC under MS-DRG v44.0.