ICD-10-CM 2027
ICD-10 code for dense deposit disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › dense deposit”. Page updated September 29, 2026.
About coding dense deposit disease
The ICD-10-CM code for dense deposit disease is N05.6 (Unspecified nephritic syndrome with dense deposit disease).
Within N05 (unspecified nephritic syndrome), N05.6 is specifically for unspecified nephritic syndrome with dense deposit disease. Related codes cover 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 diffuse crescentic glomerulonephritis (N05.7), with other morphologic changes (N05.8) 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.
Common questions about dense deposit disease ICD-10 codes
What is the ICD-10 code for dense deposit disease?
- N05.6 — Unspecified nephritic syndrome with dense deposit disease.
Is N05.6 billable?
- Yes. N05.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N05.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N05.6 as a principal diagnosis.
Is N05.6 a CC or MCC?
- No. N05.6 is neither a CC nor an MCC under MS-DRG v44.0.