ICD-10-CM 2027 diagnosis code
N05.6Unspecified nephritic syndrome with dense deposit disease
N05.6 is a valid, billable ICD-10-CM code for unspecified nephritic syndrome with dense deposit disease. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About N05.6
N05.6 is the ICD-10-CM diagnosis code for unspecified nephritic syndrome with dense deposit disease. It belongs to category N05 (unspecified nephritic syndrome), block N00-N08 (glomerular diseases) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 583.89 (nephritis and nephropathy, not specified as acute or chronic, with other specified pathological lesion in kidney).
Coding notes
- Unspecified nephritic syndrome with C3 glomerulopathy with dense deposit disease
- Unspecified nephritic syndrome with membranoproliferative glomerulonephritis, type 2
Notes that apply from higher levels
Instructions written at a parent level also apply to N05.6.
› From N05 Unspecified nephritic syndrome
- glomerular disease NOS
- glomerulonephritis NOS
- nephritis NOS
- nephropathy NOS and renal disease NOS with morphological lesion specified in .0-.8
Broader instructions also apply from N00-N08 Glomerular diseases and Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
7 entriesTerms in the official ICD-10-CM index that lead to N05.6.
- Disease, diseased › dense deposit
- Glomerulonephritis › with › C3 › glomerulopathy › with dense deposit disease
- Glomerulonephritis › dense deposit
- Glomerulonephritis › membranoproliferative (diffuse)(type 1 or 3) › dense deposit (type 2) NEC
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › with › C3 › glomerulopathy › with dense deposit disease
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › with › dense deposit disease
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › membranoproliferative (diffuse) (type 1 or 3) › type 2
Codes whose notes reference N05.6
- N05.AExcludes1
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 11 · Diseases and Disorders of the Kidney and Urinary Tract
ICD-9-CM equivalent
Converter →- 583.89Nephritis and nephropathy, not specified as acute or chronic, with other specified pathological lesion in kidneyapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about N05.6
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.
What DRG does N05.6 group to?
- N05.6 is used in the MS-DRG v44.0 logic for MS-DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC), MS-DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC) and MS-DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for N05.6?
- The CMS General Equivalence Mappings map N05.6 to ICD-9-CM 583.89.