ICD-10-CM Code For Chronic Nephritic Syndrome: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N03 includes chronic nephritic syndromes such as chronic glomerulonephritis with persistent hematuria and varying degrees of proteinuria and renal dysfunction. These ICD-10-CM diagnosis codes are used to document ongoing glomerular disease, capturing disease chronicity, severity, and organ involvement relevant to renal care. Accurate coding within the ICD-10-CM N03 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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ICD-10-CM N03: Chronic Nephritic Syndrome Overview

The ICD-10-CM N03 group represents chronic nephritic syndromes characterized by long-standing glomerular inflammation and persistent hematuria, often with proteinuria and progressive renal impairment. These diagnoses target the renal glomeruli and related kidney function abnormalities. Accurate coding matters for appropriate claim adjudication and to reflect the clinical complexity affecting treatment and follow-up.

When to Use

Use a code from this group when a patient has documented chronic nephritic syndrome or chronic glomerulonephritis with persistent hematuria and evidence of enduring renal involvement. Select the most specific code that reflects the presence of proteinuria, renal function status, and any concurrent findings documented by the clinician.

ICD-10-CM Codes

11 rows

ICD-10-CM Code	Description
N03.0	Chronic nephritic syndrome with minor glomerular abnormality
N03.1	Chronic nephritic syndrome with focal and segmental glomerular lesions
N03.2	Chronic nephritic syndrome with diffuse membranous glomerulonephritis
N03.3	Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
N03.4	Chronic nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
N03.5	Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
N03.6	Chronic nephritic syndrome with dense deposit disease
N03.7	Chronic nephritic syndrome with diffuse crescentic glomerulonephritis
N03.8	Chronic nephritic syndrome with other morphologic changes
N03.9	Chronic nephritic syndrome with unspecified morphologic changes
N03.A	Chronic nephritic syndrome with C3 glomerulonephritis

DRG Codes

3 rows

DRG Code	Description
698	Other Kidney and Urinary Tract Diagnoses with MCC
699	Other Kidney and Urinary Tract Diagnoses with CC
700	Other Kidney and Urinary Tract Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult patient with a long history of proteinuria and microscopic hematuria under nephrology follow-up presents for routine evaluation of progressive renal insufficiency with rising creatinine and persistent nephritic-range urinalysis findings despite therapy. The clinician documents chronic, persistent glomerular inflammation with gradual loss of renal function and assigns a code reflecting chronic nephritic syndrome with unspecified morphological changes. Typical codes: N03.9
A pediatric patient with known chronic glomerulonephritis complicated by hypertension and chronic edema is admitted for adjustment of antihypertensive therapy and monitoring of growth and renal status. Ongoing signs of chronic nephritic disease with systemic complications prompt coding to indicate chronic glomerular disease with specified clinical manifestations. Typical codes: N03.2, N03.5
An adult with long-standing diabetic kidney disease develops chronic nephritic features superimposed on existing renal pathology, resulting in worsening proteinuria and decreased eGFR; care is sought for management of the comorbid renal condition and coordination between endocrinology and nephrology. Documentation identifies chronic nephritic syndrome as a concurrent glomerular disease affecting management and coding reflects the chronic nephritic process. Typical codes: N03.6, N03.8

Related Codes

N00-ACUTE-NEPHRITIC-SYNDROME

ICD-10-CM Code For Acute Nephritic Syndrome: Group Overview

N01-RAPIDLY-PROGRESSIVE-NEPHRITIC-SYNDROME

ICD-10-CM Code For Rapidly Progressive Nephritic Syndrome: Group Overview

N02-RECURRENT-AND-PERSISTENT-HEMATURIA

ICD-10-CM Code For Recurrent And Persistent Hematuria: Group Overview

N04-NEPHROTIC-SYNDROME

ICD-10-CM Code For Nephrotic Syndrome: Group Overview

N05-UNSPECIFIED-NEPHRITIC-SYNDROME

ICD-10-CM Code For Unspecified Nephritic Syndrome: Group Overview

N06-ISOLATED-PROTEINURIA-WITH-LESION

ICD-10-CM Code For Isolated Proteinuria With Specified Morphological Lesion: Group Overview

N07-HEREDITARY-NEPHROPATHY-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Hereditary Nephropathy Not Elsewhere Classified: Group Overview

N08-GLOMERULAR-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Glomerular Disorders In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

11 rows

ICD-10-CM Code	Description
N03.0	Chronic nephritic syndrome with minor glomerular abnormality
N03.1	Chronic nephritic syndrome with focal and segmental glomerular lesions
N03.2	Chronic nephritic syndrome with diffuse membranous glomerulonephritis
N03.3	Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis
N03.4	Chronic nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis
N03.5	Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
N03.6	Chronic nephritic syndrome with dense deposit disease
N03.7	Chronic nephritic syndrome with diffuse crescentic glomerulonephritis
N03.8	Chronic nephritic syndrome with other morphologic changes
N03.9	Chronic nephritic syndrome with unspecified morphologic changes
N03.A	Chronic nephritic syndrome with C3 glomerulonephritis

DRG Codes

3 rows

DRG Code	Description
698	Other Kidney and Urinary Tract Diagnoses with MCC
699	Other Kidney and Urinary Tract Diagnoses with CC
700	Other Kidney and Urinary Tract Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult patient with a long history of proteinuria and microscopic hematuria under nephrology follow-up presents for routine evaluation of progressive renal insufficiency with rising creatinine and persistent nephritic-range urinalysis findings despite therapy. The clinician documents chronic, persistent glomerular inflammation with gradual loss of renal function and assigns a code reflecting chronic nephritic syndrome with unspecified morphological changes. Typical codes: N03.9
A pediatric patient with known chronic glomerulonephritis complicated by hypertension and chronic edema is admitted for adjustment of antihypertensive therapy and monitoring of growth and renal status. Ongoing signs of chronic nephritic disease with systemic complications prompt coding to indicate chronic glomerular disease with specified clinical manifestations. Typical codes: N03.2, N03.5
An adult with long-standing diabetic kidney disease develops chronic nephritic features superimposed on existing renal pathology, resulting in worsening proteinuria and decreased eGFR; care is sought for management of the comorbid renal condition and coordination between endocrinology and nephrology. Documentation identifies chronic nephritic syndrome as a concurrent glomerular disease affecting management and coding reflects the chronic nephritic process. Typical codes: N03.6, N03.8

Related Codes

N00-ACUTE-NEPHRITIC-SYNDROME

ICD-10-CM Code For Acute Nephritic Syndrome: Group Overview

N01-RAPIDLY-PROGRESSIVE-NEPHRITIC-SYNDROME

ICD-10-CM Code For Rapidly Progressive Nephritic Syndrome: Group Overview

N02-RECURRENT-AND-PERSISTENT-HEMATURIA

ICD-10-CM Code For Recurrent And Persistent Hematuria: Group Overview

N04-NEPHROTIC-SYNDROME

ICD-10-CM Code For Nephrotic Syndrome: Group Overview

N05-UNSPECIFIED-NEPHRITIC-SYNDROME

ICD-10-CM Code For Unspecified Nephritic Syndrome: Group Overview

N06-ISOLATED-PROTEINURIA-WITH-LESION

ICD-10-CM Code For Isolated Proteinuria With Specified Morphological Lesion: Group Overview

N07-HEREDITARY-NEPHROPATHY-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Hereditary Nephropathy Not Elsewhere Classified: Group Overview

N08-GLOMERULAR-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Glomerular Disorders In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Chronic Nephritic Syndrome: Group Overview

Sign up for ICD-10-CM Code For Chronic Nephritic Syndrome: Group Overview policy alerts

ICD-10-CM N03: Chronic Nephritic Syndrome Overview

ICD-10-CM Code For Chronic Nephritic Syndrome: Group Overview

Sign up for ICD-10-CM Code For Chronic Nephritic Syndrome: Group Overview policy alerts

ICD-10-CM N03: Chronic Nephritic Syndrome Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM N03 group?

How does the N03 group capture disease chronicity and severity for coding?

Which specific code should be used for chronic nephritic syndrome with diffuse membranous glomerulonephritis?

What related DRGs may be impacted by coding within the N03 group?

Why is accurate coding within the ICD-10-CM N03 group important for reimbursement?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM N03 group?

How does the N03 group capture disease chronicity and severity for coding?

Which specific code should be used for chronic nephritic syndrome with diffuse membranous glomerulonephritis?

What related DRGs may be impacted by coding within the N03 group?

Why is accurate coding within the ICD-10-CM N03 group important for reimbursement?

References