ICD-10-CM Diagnosis Code N04.B1 - Nephrotic syndrome with idiopathic immune complex membranoproliferative glomerulonephritis (IC-MPGN) (original) (raw)

ICD List 2025-2026 Edition

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6. 2026 ICD-10-CM Code N04.B1

Nephrotic syndrome with idiopathic immune complex membranoproliferative glomerulonephritis (IC-MPGN)

ICD-10-CM Code:

N04.B1

ICD-10 Code for:

Nep syn w idio imm cmplx membr prolif glomrlneph (IC-MPGN)

Is Billable?

Yes - Valid for Submission

Code Navigator:

N04.B1 is a billable diagnosis code used to specify a medical diagnosis of nephrotic syndrome with idiopathic immune complex membranoproliferative glomerulonephritis (ic-mpgn). The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

1. Code Information
2. 2026 ICD-10 Code
3. Tabular List of Diseases and Injuries
4. Index to Diseases and Injuries References
6. Diagnostic Related Groups Mapping
7. Replacement Code
8. Patient Education
9. Other Codes Used Similar Conditions
10. Code History

• Diseases of the genitourinary system
  N00–N99
  • Glomerular diseases
    N00-N08
    * Nephrotic syndrome
    N04

N04.B1 is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

• - Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) - N05.9
  • - with
    * - glomerular lesion
    * - idiopathic immune membranoproliferative glomerulonephritis (IC-MPGN) - N04.B1

References found for this diagnosis code in the External Cause of Injuries Index:

• Nephritis, nephritic(albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
  • with
    • glomerular lesion
      • idiopathic immune membranoproliferative glomerulonephritis (IC-MPGN)

N04B1 replaces the following previously assigned ICD-10-CM code(s):

• N04.8 - Nephrotic syndrome with other morphologic changes

• FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026

• Previous Code: N04.B

• Parent Code: N04.B

• Next Code: N04.B2