N05.A Unspecified nephritic syndrome with C3 glomerulonephritis
The ICD-10-CM code for Unspecified nephritic syndrome with C3 glomerulonephritis is N05.A (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- N00-N08: Glomerular diseases (N00-N08)
- Category N05
- 12 codes (11 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to N05.A:
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › with › C3 › glomerulopathy
- Glomerulonephritis › with › C3 › glomerulopathy
- Glomerulonephritis › with › C3 › glomerulonephritis
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › with › C3 › glomerulonephritis
Inclusion Terms
- Unspecified nephritic syndrome with C3 glomerulopathy
U.S. Hospital Utilization
- An estimated 230 U.S. inpatient stays in 2023 included N05.A among the documented diagnoses.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
CKD staging and code assignment (N18.-)The ICD-10-CM classifies CKD based on severity. The severity of CKD is designated by stages 1-5. Stage 2, code N18.2, equates to mild CKD; stage 3, codes N18.30-N18.32, equate to moderate CKD; and stage 4, code N18.4, equates to severe CKD. Code N18.6, End stage renal disease (ESRD), is assigned when the provider has documented end- stage renal disease (ESRD).
CKD stage plus ESRD: assign N18.6 onlyIf both a stage of CKD and ESRD are documented, assign code N18.6 only.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026