ICD-10-CM 2027
ICD-10 code for atrophic nephritis
Chronic nephritic syndrome with unspecified morphologic changes
From the official ICD-10-CM alphabetic index entry “Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › atrophic”. Page updated September 29, 2026.
About coding atrophic nephritis
The ICD-10-CM code for atrophic nephritis is N03.9 (Chronic nephritic syndrome with unspecified morphologic changes).
Within N03, choose N03.9 (with unspecified morphologic changes) only when documentation doesn't support a more specific option: with minor glomerular abnormality (N03.0), with focal and segmental glomerular lesions (N03.1), with diffuse membranous glomerulonephritis (N03.2), with diffuse mesangial proliferative glomerulonephritis (N03.3), with diffuse endocapillary proliferative glomerulonephritis (N03.4), with diffuse mesangiocapillary glomerulonephritis (N03.5), with dense deposit disease (N03.6), with diffuse crescentic glomerulonephritis (N03.7) and 2 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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 atrophic nephritis ICD-10 codes
What is the ICD-10 code for atrophic nephritis?
- N03.9 — Chronic nephritic syndrome with unspecified morphologic changes.
Is N03.9 billable?
- Yes. N03.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N03.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N03.9 as a principal diagnosis.
Is N03.9 a CC or MCC?
- N03.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.