Is N05.3 a billable ICD-10-CM code?

Yes. N05.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does N05.3 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 N05.3?

N05.3 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 N05.3 (N05) and apply to it just the same.

N05.3

N05.3 — Unspecified nephritic syndrome with diffuse mesangial proliferative glomerulonephritis

Billable / specific codeICD-10-CM

N05.3 is a billable, specific ICD-10-CM code for unspecified nephritic syndrome with diffuse mesangial proliferative glomerulonephritis. It is valid for submission on a claim.

Excludes1 inherited from the categories above N05.3

These are not written on N05.3, but they bind it: a note on a category applies to every code beneath it. Billing N05.3 with anything listed here is a denial.

Written on N05 — Unspecified nephritic syndrome

nephropathy NOS with no stated morphological lesion (N28.9)
renal disease NOS with no stated morphological lesion (N28.9)
tubulo-interstitial nephritis NOS (N12)

Other codes that can never be billed with N05.3

These codes carry an Excludes1 note pointing at N05.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N05.3 alone.

N00Acute nephritic syndrome
N01Rapidly progressive nephritic syndrome
N03Chronic nephritic syndrome
N28.9Disorder of kidney and ureter, unspecified

Risk adjustment

N05.3 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

N05.3 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 N05.3 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 N05.3.

Glomerulonephritis›diffuse›mesangial proliferative
Glomerulonephritis›mesangial›proliferative NEC(diffuse)
Nephritis, nephritic›with›diffuse›mesangial proliferative glomerulonephritis

Code history

N05.3 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 N05.3 is not quite right, the correct code is usually one of these.

Questions about N05.3

Is N05.3 a billable ICD-10-CM code?: Yes. N05.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does N05.3 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 N05.3?: N05.3 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 N05.3 (N05) and apply to it just the same.