Body system: Genitourinary SystemRegulation: 38 CFR § 4.115b
Hydronephrosis is dilation of the renal collecting system (renal pelvis and calyces) caused by obstruction of urine flow somewhere along the urinary tract — most commonly from kidney stones, ureteral strictures, ureteropelvic junction obstruction, tumors, or extrinsic compression. Chronic obstruction can lead to progressive parenchymal damage and loss of kidney function. The VA rates this condition with a layered structure: when hydronephrosis is severe enough to have impaired renal function, the renal dysfunction ladder (38 CFR § 4.115a) applies (60/80/100%). Otherwise, the standard hydronephrosis ladder applies at 10%, 20%, or 30% based on the frequency of renal colic episodes, presence of infection (pyonephrosis), and whether catheter drainage is required.
Rating levels
- 100% — You qualify for 100% if your hydronephrosis is severe enough to produce end-stage renal disease — GFR under 15 mL/min/1.73 m² sustained for 3+ consecutive months in the past year, OR routine dialysis dependence, OR transplant eligibility. The CFR phrase 'Severe; Rate as renal dysfunction' opens this tier for hydronephrosis cases that have caused permanent loss of kidney function.
- 80% — You qualify for 80% if your hydronephrosis has caused Stage 4 chronic kidney disease — GFR 15-29 mL/min/1.73 m² sustained for 3+ consecutive months in the past year.
- 60% — You qualify for 60% if your hydronephrosis has caused Stage 3b chronic kidney disease — GFR 30-44 mL/min/1.73 m² sustained for 3+ consecutive months in the past year.
- 30% — You have frequent episodes of severe kidney pain (colic) along with kidney infections that produce pus (pyonephrosis), and your kidney isn't working as well as it should. The pain attacks happen regularly, and the infections indicate your kidney's drainage system is significantly blocked, causing waste and bacteria to build up.
- 20% — You must have regular episodes of severe kidney pain called colic (intense cramping pain that comes in waves) that happen frequently enough to require medical intervention with a catheter (a tube inserted to drain urine when normal flow is blocked). These painful attacks occur often and are serious enough that you need catheter drainage to relieve the blockage and pain.
- 10% — You only experience kidney pain attacks (colic) once in a while, your kidneys are not infected, and you don't need a tube (catheter) inserted to help drain urine from your kidneys. The occasional pain episodes are manageable and don't require ongoing medical intervention beyond basic treatment.