N05.6 — Unspecified nephritic syndrome with dense deposit disease
N05.6 is a billable, specific ICD-10-CM code for unspecified nephritic syndrome with dense deposit disease. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Unspecified nephritic syndrome with C3 glomerulopathy with dense deposit disease
- Unspecified nephritic syndrome with membranoproliferative glomerulonephritis, type 2
Excludes1 inherited from the categories above N05.6
These are not written on N05.6, but they bind it: a note on a category applies to every code beneath it. Billing N05.6 with anything listed here is a denial.
Other codes that can never be billed with N05.6
These codes carry an Excludes1 note pointing at N05.6. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N05.6 alone.
Risk adjustment
N05.6 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N05.6 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55336Billing and Coding: Retroperitoneal Ultrasound
How N05.6 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N05.6.
- Disease, diseased›dense deposit
- Glomerulonephritis›dense deposit
- Glomerulonephritis›membranoproliferative›dense deposit NEC(type 2)
- Nephritis, nephritic›membranoproliferative›type 2
- Nephritis, nephritic›with›dense deposit disease
- Glomerulonephritis›with›C3›glomerulopathy›with dense deposit disease
- Nephritis, nephritic›with›C3›glomerulopathy›with dense deposit disease
Code history
N05.6 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share N05. If N05.6 is not quite right, the correct code is usually one of these.
- N05.0Unspecified nephritic syndrome with minor glomerular abnormality
- N05.1Unspecified nephritic syndrome with focal and segmental glomerular lesions
- N05.2Unspecified nephritic syndrome with diffuse membranous glomerulonephritis
- N05.3Unspecified nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
- N05.4Unspecified nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
- N05.5Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- N05.7Unspecified nephritic syndrome with diffuse crescentic glomerulonephritis
- N05.8Unspecified nephritic syndrome with other morphologic changes
- N05.9Unspecified nephritic syndrome with unspecified morphologic changes
- N05.AUnspecified nephritic syndrome with C3 glomerulonephritis
Questions about N05.6
- Is N05.6 a billable ICD-10-CM code?
- Yes. N05.6 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N05.6 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Glomerular diseases (N00-N08).
- What cannot be coded together with N05.6?
- N05.6 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above N05.6 (N05) and apply to it just the same.