N03 – Chronic nephritic syndrome
ICD-10-CM 2027 diagnosis code · Glomerular diseases
ICD-10-CM code
N03
- Code
N03(claims format:N03)- Description
- Chronic nephritic syndrome
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 14. Diseases of the genitourinary system (N00-N99)
- Block
- N00-N08 Glomerular diseases
Billable codes under N03
N03 is a header code and cannot be used on claims. Choose the most specific code:
- N03.0 – Chronic nephritic syndrome with minor glomerular abnormalityBillable
- N03.1 – Chronic nephritic syndrome with focal and segmental glomerular lesionsBillable
- N03.2 – Chronic nephritic syndrome with diffuse membranous glomerulonephritisBillable
- N03.3 – Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritisBillable
- N03.4 – Chronic nephritic syndrome with diffuse endocapillary proliferative glomerulonephritisBillable
- N03.5 – Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritisBillable
- N03.6 – Chronic nephritic syndrome with dense deposit diseaseBillable
- N03.7 – Chronic nephritic syndrome with diffuse crescentic glomerulonephritisBillable
- N03.8 – Chronic nephritic syndrome with other morphologic changesBillable
- N03.9 – Chronic nephritic syndrome with unspecified morphologic changesBillable
- N03.A – Chronic nephritic syndrome with C3 glomerulonephritisBillable
Notes for N03
Includes:
- chronic glomerular disease
- chronic glomerulonephritis
- chronic nephritis
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block N00-N08
Excludes1 (not coded here):
- hypertensive chronic kidney disease (I12.-)
Frequently asked questions
What is ICD-10 code N03?
N03 is the ICD-10-CM code for chronic nephritic syndrome, in the block N00-N08 (Glomerular diseases).
Is N03 a billable code?
No. N03 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.