ICD-10-CM 2027
ICD-10 code for nephritis
From the official ICD-10-CM alphabetic index entry “Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)”. Page updated September 29, 2026.
About coding nephritis
The ICD-10-CM code for nephritis is N05.9 (Unspecified nephritic syndrome with unspecified morphologic changes). The official index lists 110 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N05.9.
Within N05, choose N05.9 (with unspecified morphologic changes) only when documentation doesn't support a more specific option: 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 dense deposit disease (N05.6), with diffuse crescentic glomerulonephritis (N05.7) 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.
More specific nephritis codes (official index)
- with
- C3
- glomerulonephritis N05.A — Unspecified nephritic syndrome with C3 glomerulonephritis
- glomerulopathy N05.A — Unspecified nephritic syndrome with C3 glomerulonephritis
- with dense deposit disease N05.6 — Unspecified nephritic syndrome with dense deposit disease
- dense deposit disease N05.6 — Unspecified nephritic syndrome with dense deposit disease
- diffuse
- crescentic glomerulonephritis N05.7 — Unspecified nephritic syndrome with diffuse crescentic glomerulonephritis
- endocapillary proliferative glomerulonephritis N05.4 — Unspecified nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
- membranous glomerulonephritis N05.2 — Unspecified nephritic syndrome with diffuse membranous glomerulonephritis
- mesangial proliferative glomerulonephritis N05.3 — Unspecified nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
- mesangiocapillary glomerulonephritis N05.5 — Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- edema
- focal and segmental glomerular lesions N05.1 — Unspecified nephritic syndrome with focal and segmental glomerular lesions
- foot process disease N04.9 — Nephrotic syndrome with unspecified morphologic changes
- glomerular lesion
- diffuse sclerosing N05.8 — Unspecified nephritic syndrome with other morphologic changes
- hypocomplementemic
- IgA
- lobular, lobulonodular
- nodular
- idiopathic immune membranoproliferative glomerulonephritis (IC-MPGN) N04.B1 — Nephrotic syndrome with idiopathic immune complex membranoproliferative glomerulonephritis (IC-MPGN)
- secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN) N04.B2 — Nephrotic syndrome with secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN)
- lesion of
- glomerulonephritis, proliferative N05.8 — Unspecified nephritic syndrome with other morphologic changes
- renal necrosis N05.9 — Unspecified nephritic syndrome with unspecified morphologic changes
- minor glomerular abnormality N05.0 — Unspecified nephritic syndrome with minor glomerular abnormality
- specified morphological changes NEC N05.8 — Unspecified nephritic syndrome with other morphologic changes
- acute N00.9 — Acute nephritic syndrome with unspecified morphologic changes
- with
- C3
- glomerulonephritis N00.A — Acute nephritic syndrome with C3 glomerulonephritis
- glomerulopathy N00.A — Acute nephritic syndrome with C3 glomerulonephritis
- with dense deposit disease N00.6 — Acute nephritic syndrome with dense deposit disease
- dense deposit disease N00.6 — Acute nephritic syndrome with dense deposit disease
- diffuse
- crescentic glomerulonephritis N00.7 — Acute nephritic syndrome with diffuse crescentic glomerulonephritis
- endocapillary proliferative glomerulonephritis N00.4 — Acute nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
- membranous glomerulonephritis N00.2 — Acute nephritic syndrome with diffuse membranous glomerulonephritis
- mesangial proliferative glomerulonephritis N00.3 — Acute nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
- mesangiocapillary glomerulonephritis N00.5 — Acute nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- focal and segmental glomerular lesions N00.1 — Acute nephritic syndrome with focal and segmental glomerular lesions
- idiopathic immune membranoproliferative glomerulonephritis (IC-MPGN) N00.B1 — Acute nephritic syndrome with idiopathic immune membranoproliferative glomerulonephritis (IC-MPGN)
- secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN) N00.B2 — Acute nephritic syndrome with secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN)
- minor glomerular abnormality N00.0 — Acute nephritic syndrome with minor glomerular abnormality
- specified morphological changes NEC N00.8 — Acute nephritic syndrome with other morphologic changes
- amyloid E85.4 — Organ-limited amyloidosis
- antiglomerular basement membrane (anti-GBM) antibody NEC
- in Goodpasture's syndrome M31.0 — Hypersensitivity angiitis
- antitubular basement membrane (tubulo-interstitial) NEC N12 — Tubulo-interstitial nephritis, not specified as acute or chronic
- toxic
- arteriolar
- arteriosclerotic
- ascending
- atrophic N03.9 — Chronic nephritic syndrome with unspecified morphologic changes
- Balkan (endemic) N15.0 — Balkan nephropathy
- calculous, calculus
- cardiac
- cardiovascular
- chronic N03.9 — Chronic nephritic syndrome with unspecified morphologic changes
- with
- C3
- glomerulonephritis N03.A — Chronic nephritic syndrome with C3 glomerulonephritis
- glomerulopathy N03.A — Chronic nephritic syndrome with C3 glomerulonephritis
- with dense deposit disease N03.6 — Chronic nephritic syndrome with dense deposit disease
- dense deposit disease N03.6 — Chronic nephritic syndrome with dense deposit disease
- diffuse
- crescentic glomerulonephritis N03.7 — Chronic nephritic syndrome with diffuse crescentic glomerulonephritis
- endocapillary proliferative glomerulonephritis N03.4 — Chronic nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
- membranous glomerulonephritis N03.2 — Chronic nephritic syndrome with diffuse membranous glomerulonephritis
- mesangial proliferative glomerulonephritis N03.3 — Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
- mesangiocapillary glomerulonephritis N03.5 — Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- focal and segmental glomerular lesions N03.1 — Chronic nephritic syndrome with focal and segmental glomerular lesions
- minor glomerular abnormality N03.0 — Chronic nephritic syndrome with minor glomerular abnormality
- specified morphological changes NEC N03.8 — Chronic nephritic syndrome with other morphologic changes
- arteriosclerotic
- cirrhotic N26.9 — Renal sclerosis, unspecified
- complicating pregnancy O26.83 — Pregnancy related renal disease
- croupous N00.9 — Acute nephritic syndrome with unspecified morphologic changes
- degenerative
- diffuse sclerosing N05.8 — Unspecified nephritic syndrome with other morphologic changes
- due to
- diabetes mellitus
- subacute bacterial endocarditis I33.0 — Acute and subacute infective endocarditis
- systemic lupus erythematosus (chronic) M32.14 — Glomerular disease in systemic lupus erythematosus
- typhoid fever A01.09 — Typhoid fever with other complications
- gonococcal (acute) (chronic) A54.21 — Gonococcal infection of kidney and ureter
- hypocomplementemic
- IgA
- immune complex (circulating) NEC N05.8 — Unspecified nephritic syndrome with other morphologic changes
- infective
- interstitial
- lead N14.3 — Nephropathy induced by heavy metals
- membranoproliferative (diffuse) (type 1 or 3) N05.5 — Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- type 2 N05.6 — Unspecified nephritic syndrome with dense deposit disease
- minimal change N05.0 — Unspecified nephritic syndrome with minor glomerular abnormality
- necrotic, necrotizing NEC N05.8 — Unspecified nephritic syndrome with other morphologic changes
- nephrotic
- nodular
- polycystic Q61.3 — Polycystic kidney, unspecified
- adult type Q61.2 — Polycystic kidney, adult type
- autosomal
- dominant Q61.2 — Polycystic kidney, adult type
- recessive NEC Q61.19 — Other polycystic kidney, infantile type
- childhood type NEC Q61.19 — Other polycystic kidney, infantile type
- infantile type NEC Q61.19 — Other polycystic kidney, infantile type
- poststreptococcal N05.9 — Unspecified nephritic syndrome with unspecified morphologic changes
- acute N00.9 — Acute nephritic syndrome with unspecified morphologic changes
- chronic N03.9 — Chronic nephritic syndrome with unspecified morphologic changes
- rapidly progressive N01.9 — Rapidly progressive nephritic syndrome with unspecified morphologic changes
- proliferative NEC N05.8 — Unspecified nephritic syndrome with other morphologic changes
- purulent
- rapidly progressive N01.9 — Rapidly progressive nephritic syndrome with unspecified morphologic changes
- with
- C3
- glomerulonephritis N01.A — Rapidly progressive nephritic syndrome with C3 glomerulonephritis
- glomerulopathy N01.A — Rapidly progressive nephritic syndrome with C3 glomerulonephritis
- with dense deposit disease N01.6 — Rapidly progressive nephritic syndrome with dense deposit disease
- dense deposit disease N01.6 — Rapidly progressive nephritic syndrome with dense deposit disease
- diffuse
- crescentic glomerulonephritis N01.7 — Rapidly progressive nephritic syndrome with diffuse crescentic glomerulonephritis
- endocapillary proliferative glomerulonephritis N01.4 — Rapidly progressive nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
- membranous glomerulonephritis N01.2 — Rapidly progressive nephritic syndrome with diffuse membranous glomerulonephritis
- mesangial proliferative glomerulonephritis N01.3 — Rapidly progressive nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
- mesangiocapillary glomerulonephritis N01.5 — Rapidly progressive nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
- focal and segmental glomerular lesions N01.1 — Rapidly progressive nephritic syndrome with focal and segmental glomerular lesions
- minor glomerular abnormality N01.0 — Rapidly progressive nephritic syndrome with minor glomerular abnormality
- specified morphological changes NEC N01.8 — Rapidly progressive nephritic syndrome with other morphologic changes
- salt losing or wasting NEC N28.89 — Other specified disorders of kidney and ureter
- saturnine N14.3 — Nephropathy induced by heavy metals
- sclerosing, diffuse N05.8 — Unspecified nephritic syndrome with other morphologic changes
- septic
- specified pathology NEC N05.8 — Unspecified nephritic syndrome with other morphologic changes
- subacute N01.9 — Rapidly progressive nephritic syndrome with unspecified morphologic changes
- suppurative
- syphilitic (late) A52.75 — Syphilis of kidney and ureter
- congenital A50.59 — Other late congenital syphilis, symptomatic
- early (secondary) A51.44 — Secondary syphilitic nephritis
- toxic
- tubal, tubular
- tuberculous A18.11 — Tuberculosis of kidney and ureter
- tubulo-interstitial (in) N12 — Tubulo-interstitial nephritis, not specified as acute or chronic
- acute (infectious) N10 — Acute pyelonephritis
- chronic (infectious) N11.9 — Chronic tubulo-interstitial nephritis, unspecified
- nonobstructive N11.8 — Other chronic tubulo-interstitial nephritis
- reflux-associated N11.0 — Nonobstructive reflux-associated chronic pyelonephritis
- obstructive N11.1 — Chronic obstructive pyelonephritis
- specified NEC N11.8 — Other chronic tubulo-interstitial nephritis
- due to
- brucellosis A23.9 — Brucellosis, unspecified
- cryoglobulinemia D89.1 — Cryoglobulinemia
- glycogen storage disease E74.00 — Glycogen storage disease, unspecified
- Sjögren's syndrome M35.04 — Sjogren syndrome with tubulo-interstitial nephropathy
- vascular
- war N00.9 — Acute nephritic syndrome with unspecified morphologic changes
Common questions about nephritis ICD-10 codes
What is the ICD-10 code for nephritis?
- N05.9 — Unspecified nephritic syndrome with unspecified morphologic changes. More specific codes apply when the documentation supports them: N05.A, N05.A, N05.6, N05.6 and others below.
What is the ICD-10 code for acute nephritis?
- N00.9 — Acute nephritic syndrome with unspecified morphologic changes.
What is the ICD-10 code for amyloid nephritis?
- E85.4 — Organ-limited amyloidosis.
What is the ICD-10 code for antitubular basement membrane nec nephritis?
- N12 — Tubulo-interstitial nephritis, not specified as acute or chronic.
What is the ICD-10 code for atrophic nephritis?
- N03.9 — Chronic nephritic syndrome with unspecified morphologic changes.
What is the ICD-10 code for balkan nephritis?
- N15.0 — Balkan nephropathy.
What is the ICD-10 code for chronic nephritis?
- N03.9 — Chronic nephritic syndrome with unspecified morphologic changes.
Is N05.9 billable?
- Yes. N05.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N05.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N05.9 as a principal diagnosis.
Is N05.9 a CC or MCC?
- No. N05.9 is neither a CC nor an MCC under MS-DRG v44.0.