N28.81 Hypertrophy of kidney

Billable ICD-10-CM code, FY2026.

Applies from N28.8 Other specified disorders of kidney and ureter

Excludes1 (never code together)

• hydroureter (N13.4)
• ureteric stricture with hydronephrosis (N13.1)
• ureteric stricture without hydronephrosis (N13.5)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 593.1 Hypertrophy of kidney

Code annotations containing back-references to N28.81

Back-references to N28.81

• Type 2 Excludes: R93.4 Abnormal findings on diagnostic imaging of urinary organs ("hypertrophy of kidney (N28.81)")

Diagnosis Index entries for N28.81

• Hypertrophy, hypertrophic › kidney (compensatory)

Nearby codes

• N28 Other disorders of kidney and ureter, not elsewhere classified
• N28.0 Ischemia and infarction of kidney
• N28.1 Cyst of kidney, acquired
• N28.8 Other specified disorders of kidney and ureter
• N28.81 Hypertrophy of kidney (this code)
• N28.82 Megaloureter
• N28.83 Nephroptosis
• N28.84 Pyelitis cystica
• N28.85 Pyeloureteritis cystica
• N28.86 Ureteritis cystica