Diagnostic Code 7509 · 38 CFR §4.115b
Hydronephrosis is swelling of the kidney caused by urine backing up when it cannot drain properly. This can result from kidney stones, ureter strictures, tumors, or other obstructions. If not relieved, the pressure damages kidney tissue. Veterans may develop hydronephrosis from service-connected kidney stones, urinary tract injuries, or as a complication of pelvic or abdominal injuries during service.
| Rating | Criteria |
|---|---|
| 10% | Only an occasional attack of colic, not infected and not requiring catheter drainage. |
| 20% | Frequent attacks of colic requiring catheter drainage. |
| 30% | Frequent attacks of colic with infection (pyonephrosis) and kidney function impaired. Severe hydronephrosis is rated as renal dysfunction, which can provide evaluations up to 100%. |
Imaging showing the dilated kidney collecting system is essential. Records of the cause of the obstruction help establish the chain of events. Treatment records including stent placements, nephrostomy tubes, or surgical interventions demonstrate severity. Kidney function tests showing damage from the obstruction support higher ratings.
Yes. Kidney stones are one of the most common causes of hydronephrosis. When a stone blocks the ureter, urine backs up into the kidney and causes it to swell. If you have service-connected kidney stones and develop hydronephrosis, the hydronephrosis is secondary to the stones.
It depends on the cause and duration. If the obstruction is relieved quickly, the kidney usually recovers fully. Prolonged obstruction can cause permanent kidney damage. Chronic or recurring obstructions cause cumulative damage over time.