N03.6 vs N03.A
N03.6 (Chronic nephritic syndrome with dense deposit disease) compared with N03.A (Chronic nephritic syndrome with C3 glomerulonephritis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. N03.A carries an Excludes1 note covering N03.6: “Chronic nephritic syndrome (with C3 glomerulopathy) with dense deposit disease (N03.6)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| N03.6Chronic nephritic syndrome with dense deposit disease | N03.AChronic nephritic syndrome with C3 glomerulonephritis | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Chronic nephritic syndrome with dense deposit disease is a billable ICD-10-CM diagnosis code (N03.6). | Chronic nephritic syndrome with C3 glomerulonephritis is a billable ICD-10-CM diagnosis code (N03.A). |
| Includes | chronic glomerular disease chronic glomerulonephritis chronic nephritis Chronic nephritic syndrome with C3 glomerulopathy with dense deposit disease | chronic glomerular disease chronic glomerulonephritis chronic nephritis Chronic nephritic syndrome with C3 glomerulopathy |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources