N25.9Disorder resulting from impaired renal tubular function, unspecified

N25.9 is the ICD-10-CM diagnosis code for disorder resulting from impaired renal tubular function, unspecified. It belongs to category N25 (disorders resulting from impaired renal tubular function), block N25-N29 (other disorders of kidney and ureter) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N25, choose N25.9 (Disorder resulting from impaired renal tubular function, unspecified) only when documentation doesn't support a more specific option: renal osteodystrophy (N25.0), Nephrogenic diabetes insipidus (N25.1) and other disorders resulting from impaired renal tubular function (N25.8).

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 588.9 (unspecified disorder resulting from impaired renal function).