N06.21 Primary membranous nephropathy with isolated proteinuria

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Idiopathic membranous nephropathy (with isolated proteinuria)
• Primary membranous nephropathy, NOS

Excludes1 (never code together)

• primary membranous nephropathy with nephrotic syndrome (N04.21)

Applies from N06 Isolated proteinuria with specified morphological lesion

Excludes1 (never code together)

• Proteinuria not associated with specific morphologic lesions (R80.0)

MS-DRG index

Defines the logic of DRG(s) 698-700 in MDC 11.

Code annotations containing back-references to N06.21

Back-references to N06

• Type 1 Excludes: R80.0 Isolated proteinuria ("isolated proteinuria with specific morphological lesion (N06.-)")

Diagnosis Index entries for N06.21

• Nephropathy › membranous (diffuse) › primary

Nearby codes

• N06 Isolated proteinuria with specified morphological lesion
• N06.0 Isolated proteinuria with minor glomerular abnormality
• N06.1 Isolated proteinuria with focal and segmental glomerular lesions
• N06.2 Isolated proteinuria with diffuse membranous glomerulonephritis
• N06.20 Isolated proteinuria with diffuse membranous glomerulonephritis, unspecified
• N06.21 Primary membranous nephropathy with isolated proteinuria (this code)
• N06.22 Secondary membranous nephropathy with isolated proteinuria
• N06.29 Other isolated proteinuria with diffuse membranous glomerulonephritis
• N06.3 Isolated proteinuria with diffuse mesangial proliferative glomerulonephritis
• N06.4 Isolated proteinuria with diffuse endocapillary proliferative glomerulonephritis
• N06.5 Isolated proteinuria with diffuse mesangiocapillary glomerulonephritis