N03
ICD-10Non-billable categoryChronic nephritic syndrome
Official ICD-10-CM descriptor (FY2026)
Chronic nephritic syndrome
N03 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- chronic glomerular disease
- chronic glomerulonephritis
- chronic nephritis
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- chronic tubulo-interstitial nephritis (N11.-)
- diffuse sclerosing glomerulonephritis (N05.8-)
- nephritic syndrome NOS (N05.-)
More specific codes under N03
- N03.0Chronic nephritic syndrome with minor glomerular abnormality
- N03.1Chronic neph syndrome w focal and seg glomerular lesions
- N03.2Chronic nephritic syndrome w diffuse membranous glomrlneph
- N03.3Chronic neph syndrome w diffuse mesangial prolif glomrlneph
- N03.4Chronic neph syndrome w diffuse endocaplry prolif glomrlneph
- N03.5Chronic nephritic syndrome w diffuse mesangiocap glomrlneph
- N03.6Chronic nephritic syndrome with dense deposit disease
- N03.7Chronic nephritic syndrome w diffuse crescentic glomrlneph
- N03.8Chronic nephritic syndrome with other morphologic changes
- N03.9Chronic nephritic syndrome with unsp morphologic changes
- N03.AChronic nephritic syndrome with C3 glomerulonephritis
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.