ICD-10-CM 2027
ICD-10 code for membranoproliferative nephritis
Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
From the official ICD-10-CM alphabetic index entry “Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › membranoproliferative (diffuse) (type 1 or 3)”. Page updated September 29, 2026.
About coding membranoproliferative nephritis
The ICD-10-CM code for membranoproliferative nephritis is N05.5 (Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N05.5.
Within N05 (unspecified nephritic syndrome), N05.5 is specifically for unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis. 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 dense deposit disease (N05.6), with diffuse crescentic glomerulonephritis (N05.7), with other morphologic changes (N05.8) and 2 more.
Don't report N05.5 together with the conditions in its Excludes1 note: Unspecified nephritic syndrome with C3 glomerulonephritis (N05.A) and Unspecified nephritic syndrome with C3 glomerulopathy (N05.A).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific membranoproliferative nephritis codes (official index)
- type 2 N05.6 — Unspecified nephritic syndrome with dense deposit disease
Don't confuse with (Excludes1 for N05.5)
Common questions about membranoproliferative nephritis ICD-10 codes
What is the ICD-10 code for membranoproliferative nephritis?
- N05.5 — Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis. More specific codes apply when the documentation supports them: N05.6.
What is the ICD-10 code for type 2 membranoproliferative nephritis?
- N05.6 — Unspecified nephritic syndrome with dense deposit disease.
Is N05.5 billable?
- Yes. N05.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N05.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N05.5 as a principal diagnosis.
Is N05.5 a CC or MCC?
- N05.5 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.