ICD-10-CM 2027
ICD-10 code for Poststreptococcal nephritis
From the official ICD-10-CM alphabetic index entry “Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › poststreptococcal”. Page updated September 29, 2026.
About coding Poststreptococcal nephritis
The ICD-10-CM code for Poststreptococcal nephritis is N05.9 (Unspecified nephritic syndrome with unspecified morphologic changes). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N05.9.
Within N05, choose N05.9 (with unspecified morphologic changes) only when documentation doesn't support a more specific option: with minor glomerular abnormality (N05.0), with focal and segmental glomerular lesions (N05.1), with diffuse membranous glomerulonephritis (N05.2), with diffuse mesangial proliferative glomerulonephritis (N05.3), with diffuse endocapillary proliferative glomerulonephritis (N05.4), with diffuse mesangiocapillary glomerulonephritis (N05.5), with dense deposit disease (N05.6), with diffuse crescentic glomerulonephritis (N05.7) and 2 more.
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.
More specific Poststreptococcal nephritis codes (official index)
Common questions about Poststreptococcal nephritis ICD-10 codes
What is the ICD-10 code for Poststreptococcal nephritis?
- N05.9 — Unspecified nephritic syndrome with unspecified morphologic changes. More specific codes apply when the documentation supports them: N00.9, N03.9, N01.9.
What is the ICD-10 code for acute poststreptococcal nephritis?
- N00.9 — Acute nephritic syndrome with unspecified morphologic changes.
What is the ICD-10 code for chronic poststreptococcal nephritis?
- N03.9 — Chronic nephritic syndrome with unspecified morphologic changes.
What is the ICD-10 code for rapidly progressive poststreptococcal nephritis?
- N01.9 — Rapidly progressive nephritic syndrome with unspecified morphologic changes.
Is N05.9 billable?
- Yes. N05.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N05.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N05.9 as a principal diagnosis.
Is N05.9 a CC or MCC?
- No. N05.9 is neither a CC nor an MCC under MS-DRG v44.0.