38 CFR Part 4 — 38 CFR § 4.115
Hydronephrosis
dc-7509-hydronephrosis
Genitourinary
Diagnostic code
7509
Why your DC matters: DC 7509 is the exact code the VA uses to rate this condition. It determines which symptoms unlock which percentage, what evidence the rater looks for, and which secondaries are most likely to be approved.
Last verified against 38 CFR (eCFR Part 4):
Rating criteria (38 CFR Part 4)
Diagnostic code 7509 — Hydronephrosis — is listed under 38 CFR § 4.115 in 38 CFR Part 4. The paragraphs below summarize how this code is used; the official schedule text controls exact percentages, formulas, and notes.
Schedule summary (educational, not a substitute for the regulation): Educational index row from the rating schedule naming convention; confirm exact diagnostic code, effective date, and criteria in the current eCFR Part 4.
Exact rating criteria: Open Part 4 in the eCFR (link under “Official source” below). Locate your diagnostic code number (7509) in the correct body-system subpart, or use Find in Page (Ctrl+F / ⌘F) for “7509”. Copy the verbatim rating table, including any parenthetical notes, exceptions, and cross-references, for the version of Part 4 that applies to your effective date.
Effective dates & which schedule version applies
Which diagnostic code, percentage, and effective date apply depends on the facts of your claim and the version of the rating schedule in force for the period being decided. Generally, VA applies the schedule in effect at the specified time under 38 U.S.C. § 5110 and implementing rules, subject to exceptions (e.g., protected ratings, liberalizing law changes—see regulation and VA manual policy as applicable).
For older claims, the **current** eCFR may not match the text that applied years ago. If your decision references a prior percentage or code, compare against the Part 4 text **as of** your claim’s relevant dates; historical Federal Register / CFR snapshots may be needed for precise comparison.
The “Last verified” date on this page is when we last checked this educational summary against the electronic CFR—not the date of any VA policy or your personal claim decision.
Notes for your claim
Evidence: Show that your diagnosis and severity match the factors the schedule names for DC 7509 (e.g., measurements, frequency, treatment, functional loss), with medical and lay evidence as appropriate.
C&P exams: Results should reflect the schedule’s requirements (correct joints measured, correct formulas). If the exam omits required findings, consider submitting records or requesting clarification.
If you disagree with the DC, percentage, or effective date, review the Part 4 text for your period and consider a supplemental claim or appeal with a VA-accredited representative.
This site does not provide legal advice.
Official source
38 CFR Part 4 (eCFR) — locate diagnostic code 7509 in the subpart for your body system (use Find in Page if needed).
DC 7509 (hydronephrosis) is a small-ceiling code — caps at 30% on its own face. The trap is veterans accept 10% or 20% when their hydronephrosis has progressed enough to cause renal dysfunction, at which point the schedule explicitly allows rating as renal dysfunction (§ 4.115a) instead — opening the path to 60-100%. The other play is stacking: hydronephrosis from urolithiasis (DC 7508), pyelonephritis (DC 7504), or other obstructive pathology often coexists with the underlying cause, and both can rate separately if independently established.
Rating Tiers — What Each Percentage Requires
| Rating | What It Takes | Evidence That Supports It |
|---|---|---|
| 30% | Frequent attacks of colic with infection (pyonephrosis) and impaired kidney function. | Urology records documenting recurrent colic + culture-positive UTI + imaging showing hydronephrosis + labs showing renal impairment. |
| 20% | Frequent attacks of colic requiring catheter drainage. | Hospitalization or outpatient records documenting catheter / stent placement for symptomatic relief of recurrent colic episodes. |
| 10% | Only an occasional attack of colic, not infected and not requiring catheter drainage. | Imaging confirming hydronephrosis + history of occasional colic episodes managed conservatively. |
| 100% | If severe, rate as renal dysfunction under § 4.115a (up to 100%). | When hydronephrosis has caused significant renal impairment, switch to the renal dysfunction formula — same evidence as DC 7530/7502. |
What Qualifies as 'Hydronephrosis' Under DC 7509?
Dilation of the renal pelvis / calyces from urinary obstruction
Imaging-confirmed dilation of the upper urinary tract from outflow obstruction. Can be acute (stone, clot) or chronic (stricture, BPH, tumor, congenital).
Tier ladder caps at 30%
10% — occasional colic. 20% — frequent colic + catheter drainage. 30% — frequent colic + infection (pyonephrosis) + impaired renal function.
Above 30% — rate as renal dysfunction
When severe, the schedule directs rating under the § 4.115a renal dysfunction formula instead of DC 7509's face value. Opens 60-100% tiers.
Language Your Rater Needs to See
These are the exact (or near-exact) regulatory phrases that unlock specific tiers. If your DBQ or C&P report doesn't use this vocabulary, the rater may default to a lower percentage even when symptoms qualify.
“Frequent attacks of colic with infection (pyonephrosis) and impaired kidney function”
30% gate — all three elements required (colic + infection + impaired function). Pyonephrosis (infected hydronephrosis) is a urologic emergency; if documented, the 30% gate is clear.
“If severe, rate as renal dysfunction”
The schedule's escape hatch above 30%. When hydronephrosis has progressed to cause renal impairment, switch rating formula to § 4.115a renal dysfunction — opens 60%, 80%, 100% paths.
“Frequent attacks of colic requiring catheter drainage”
20% gate. Catheter or stent placement for symptomatic relief documents this. Pull operative reports.
Evidence Checklist — Specific to This Condition
Renal imaging (US, CT, IVP) confirming hydronephrosis
CRITICALAnatomical confirmation + grade (mild / moderate / severe). Anchors the diagnosis.
Urology consults documenting colic frequency
CRITICALAnnual count of colic episodes. Drives 10 vs. 20 vs. 30% tiers.
Operative reports for stent / nephrostomy / catheter placement
CRITICALDocuments 'requiring catheter drainage' for 20% tier.
Urine culture results
IMPORTANTPyonephrosis (infected hydronephrosis) for 30% tier requires positive culture documentation.
Serial CMP / BMP showing renal function
IMPORTANTIf eGFR < 60 or rising creatinine, supports switch to renal dysfunction formula for higher tiers.
Underlying obstructive cause workup
SUPPORTINGStones (DC 7508), strictures, masses — identifies primary pathology and supports secondary claims.
C&P Exam Tips
Bring imaging reports (US / CT)
Grade of hydronephrosis (mild/moderate/severe) supports the tier discussion.
Bring colic episode log
Date + duration + management for each episode. Drives tier gates.
Document any stent / nephrostomy placements
Operative report alone supports 20% (catheter drainage) or escalation discussion.
Bring labs showing renal function
If eGFR declining, opens path to renal dysfunction formula above 30% ceiling.
Common Mistakes That Cost Veterans Points
Accepting the 30% ceiling without switching to renal dysfunction formula
When hydronephrosis has caused renal impairment (eGFR < 60, rising creatinine), the schedule allows rating as renal dysfunction instead — opening 60-100% paths. Don't accept 30% if your kidneys are failing.
Not filing the underlying cause separately
Hydronephrosis from urolithiasis (DC 7508) rates separately if independently SC. Same for strictures, BPH, tumors. Don't let DC 7509 absorb the underlying pathology.
Missing the 20% tier when stent was placed
Catheter drainage = 20% minimum. If you've had a stent for symptomatic relief, the operative report alone supports 20%.
Confusing 30% pyonephrosis with simple infection
Pyonephrosis is INFECTED HYDRONEPHROSIS — urine culture positive AND imaging showing hydronephrosis AND impaired kidney function. All three required. Plain UTI doesn't qualify.
Tactical Plays
⚡ Don't accept 30% ceiling if eGFR is declining — switch to renal dysfunction formula
DC 7509 caps at 30% on its face, but the schedule explicitly says 'if severe, rate as renal dysfunction.' If your hydronephrosis has caused renal impairment (eGFR < 60 sustained, creatinine rising trend), calculate the renal dysfunction tier under § 4.115a and file under that path instead. 60%, 80%, or 100% become available.
⚡ File underlying cause separately — don't let 7509 absorb it
Hydronephrosis from urolithiasis (DC 7508), strictures, BPH (DC 7527), or other obstructive pathology rates separately if the underlying condition is independently service-connected. Stones + hydronephrosis + pyelonephritis (the obstructive trifecta) can stack all three when documented.
⚡ Stent placement = automatic 20%
If you've ever had a ureteral stent or nephrostomy tube placed for symptomatic hydronephrosis, the operative report alone documents 'requiring catheter drainage' — the 20% tier. Don't let the rater stay at 10%.
⚡ Pull renal imaging + functional labs together
Imaging grades the hydronephrosis (anatomy); labs show the functional consequence. Both matter. Without function data, the rater defaults to the lowest tier; without imaging, the diagnosis isn't anchored.
Secondary Conditions to File With This One
Urolithiasis (cause)
STRONGDC 7508
Stones cause obstructive hydronephrosis. Both rate separately if independently established. Common combination.
Pyelonephritis (consequence)
STRONGDC 7504
Hydronephrosis predisposes to upper UTI / pyelonephritis from urinary stasis. Bidirectional secondary.
Chronic renal disease (downstream)
STRONGDC 7502 / 7530
Chronic hydronephrosis causes parenchymal loss → CKD. Direct secondary pathway.
Hypertension (renal-driven)
MODERATEDC 7101
Renal scarring from chronic hydronephrosis drives secondary HTN.
Erectile dysfunction (post-instrumentation)
SITUATIONALDC 7522
Multiple urologic procedures (stenting, nephrostomies) can contribute to ED. Document the timeline.
Compensation Scenarios
2026 rates (effective Dec 1, 2025, per va.gov)
10% — single, no dependents
Base rating
$180.42
TOTAL
$180.42/mo
Occasional colic, no infection, no drainage.
20% — single, no dependents
Base rating
$356.66
TOTAL
$356.66/mo
Frequent colic + catheter / stent drainage.
30% — single, no dependents
Base rating
$552.47
TOTAL
$552.47/mo
Frequent colic + pyonephrosis + impaired renal function.
60% — single, no dependents
Base rating
$1,435.02
TOTAL
$1,435.02/mo
Rated as renal dysfunction — eGFR < 60 sustained.
30% DC 7509 + 30% DC 7508 stones + 30% DC 7504 pyelo
Base rating
$1,435.02
TOTAL
$1,435.02/mo
Obstructive trifecta — combined ~66% rounds to 60%.
Note: Amounts are approximations rounded to nearest dollar. Actual comp varies with effective date, dependents (spouse, children, parents — each adds), Aid & Attendance, and additional disabilities. Combined ratings use VA Math (§ 4.25), not simple addition.
Key Definitions
🦠What's the difference between hydronephrosis and pyonephrosis?
Hydronephrosis = dilated upper tract from obstruction (anatomical). Pyonephrosis = INFECTED hydronephrosis — urine + pus in the obstructed system. Pyonephrosis is a urologic emergency requiring drainage. The 30% DC 7509 tier requires pyonephrosis + impaired renal function.
🔀When do I rate as renal dysfunction instead?
The schedule says 'if severe, rate as renal dysfunction' under DC 7509. Practically, when hydronephrosis has caused sustained eGFR < 60, rising creatinine, or other renal function impairment, the renal dysfunction formula (§ 4.115a) yields a higher rating than the 30% DC 7509 ceiling. Switch formulas at that point.
🪡What is 'catheter drainage' for the 20% tier?
Ureteral stent, nephrostomy tube, or other percutaneous drainage procedure performed to relieve obstruction. The operative report documents it. Internal stents (placed during scoping) count just as much as external nephrostomies.
👶Does congenital hydronephrosis qualify?
Service connection requires in-service incurrence or aggravation. Congenital hydronephrosis that was asymptomatic before service and became symptomatic during service may be service-connected by aggravation. Pre-existing congenital condition rules apply.
How to File Your Claim
Pull renal imaging (US, CT, IVP) confirming hydronephrosis
Anatomical anchor for the diagnosis + grade.
Document colic episode history + any stent/nephrostomy placements
Drives the 10/20/30% tier discussion.
Pull labs — CMP, BMP, eGFR trend
If renal function impaired, calculate under renal dysfunction formula for higher tier.
File 21-526EZ specifying 'hydronephrosis (DC 7509)' with renal dysfunction alternate path
Note both rating paths in claim narrative; let the rater see the analysis.
File underlying cause (stones, stricture, BPH) and downstream (pyelo, CKD) secondaries
Stacking authorized when independently established.
Typical Claim Timeline
File initial claim
Day 0–7: Submit VA Form 21-526EZ with all medical evidence on file
VA acknowledges claim
Week 1–2: Receive confirmation letter and claim tracking number
C&P examination scheduled
Month 1–3: VA contracts an exam vendor and sends you appointment notice
Attend C&P exam
Bring your full evidence package; describe symptoms on your worst days, not your best
Decision & rating notice
Month 3–6: Decision letter with rating percentage and effective date
First payment & retro back pay
Within 15 days of decision; retroactive to claim date (or effective date if earlier)
Timeline varies by case complexity and VA regional office workload. Some claims resolve faster; others take longer.
Important Considerations
Don't accept the 30% ceiling — switch formulas when severe
If hydronephrosis has caused renal dysfunction (eGFR < 60 sustained), rate under § 4.115a renal dysfunction formula instead of DC 7509's 30% cap. 60-100% becomes available.
Stent placement = automatic 20%
Operative report for any ureteral stent or nephrostomy tube documents 'requiring catheter drainage' — the 20% tier.
Stack underlying cause + downstream consequences
Stones (DC 7508), pyelo (DC 7504), CKD (DC 7502) all rate separately when independently established.
Pyonephrosis is INFECTED hydronephrosis — specific criterion for 30%
30% requires the trifecta: frequent colic + pyonephrosis (culture-positive) + impaired renal function. Plain UTI without imaging-confirmed infected obstruction doesn't qualify.
Related Tools & Resources
Frequently Asked Questions
Can I get above 30% for hydronephrosis?
Yes — when hydronephrosis has caused renal dysfunction (eGFR < 60 sustained, rising creatinine, BUN elevation), the schedule allows rating as renal dysfunction instead of DC 7509's face-value 30% cap. 60%, 80%, or 100% become available via the § 4.115a renal dysfunction formula.
Does a ureteral stent placement support a higher tier?
Yes — 20% requires 'frequent attacks of colic requiring catheter drainage.' Any ureteral stent or nephrostomy tube placement for symptomatic relief qualifies. Operative report is sufficient evidence.
Can I rate hydronephrosis and stones separately?
Yes — DC 7509 (hydronephrosis) and DC 7508 (urolithiasis) rate separately when both conditions are independently established. They often coexist (stone causes obstruction → hydronephrosis). Both can be service-connected if both are documented.
What if my hydronephrosis is from BPH?
BPH (prostatic hypertrophy) is rated under DC 7527 (separate genitourinary code). Hydronephrosis as a complication of BPH rates under DC 7509. Both can stack if independently established and the BPH is service-connected.
Does occasional colic without infection qualify?
Yes — 10% is assigned for 'only an occasional attack of colic, not infected and not requiring catheter drainage.' Even mild, intermittent hydronephrosis-related colic supports the 10% minimum if imaging confirms the diagnosis.
Official Regulatory Source
Hydronephrosis is rated under 38 CFR § 4.115b, DC 7509 — face-value cap at 30%, with escape to § 4.115a renal dysfunction formula when severe.
38 CFR § 4.115b — Genitourinary Diagnoses (eCFR) →Scroll to DC 7509. Cross-reference § 4.115a for the renal dysfunction path used above 30%. DC 7508 (urolithiasis) and DC 7504 (pyelonephritis) frequently coexist and rate separately.
Next Steps
If your rating decision lists DC 7509, compare your current symptoms and documentation against the criteria above. Consider:
- Requesting a copy of your rating decision and C&P exam report from the VA
- Gathering all relevant medical records (VA and private providers)
- Documenting functional limitations and how they impact work and daily activities
- Obtaining a nexus letter if needed to establish or strengthen service connection
- Filing for secondary conditions that may be related to this primary condition
- Contacting a VA-accredited VSO, claims agent, or attorney to review your file
This is general educational information only — not legal or medical advice.
Also: DC code lookup (tools) lists the same index in a compact layout.
Source: 38 CFR Part 4, Diagnostic Code 7509 • va.gov
⚠️ Important Disclaimer
This page provides general educational information only based on public VA regulations (38 CFR) and va.gov resources. It is not legal, medical, or claims assistance. Ratings and service connections are decided case-by-case by the VA based on the individual veteran’s evidence. We do not prepare claims, generate documents, or provide personalized advice. Always consult a VA-accredited Veterans Service Organization (VSO), attorney, or your physician for help with your specific situation. Verify the latest rules on va.gov.