FREE CNN Exam Guide 2026: Pass NNCC Nephrology Nurse Cert

NNCC CNN Exam Guide 2026: The Broad Nephrology Nursing Credential

The Certified Nephrology Nurse (CNN) credential, administered by the Nephrology Nursing Certification Commission (NNCC), validates expert-level registered nurse practice across the full spectrum of nephrology — not just in-center hemodialysis, but chronic kidney disease (CKD) management, peritoneal dialysis, home therapies, transplant, pediatric nephrology, acute kidney injury, and transitions of care. If your practice crosses modalities and you care for kidney patients across the life cycle, CNN is the credential designed for you.

CNN is distinct from its sister credentials. The CDN (Certified Dialysis Nurse) focuses primarily on patients undergoing hemodialysis — including chronic HD, AKI, post-transplant delayed graft function (DGF), water treatment, and unit emergency planning. The CCHT (Certified Clinical Hemodialysis Technician) is for dialysis technicians, not RNs. The CNN-NP (Certified Nephrology Nurse – Nurse Practitioner) is for advanced practice providers. Understanding where your practice fits is the single most important decision before you apply — and the NNCC announced in January 2026 that certification will be based on your role, not your education, with the BSN requirement being dropped for both CNN and CDN effective Summer 2026.

This FREE 2026 guide walks through the full exam structure, the five content domains with their percentages and objective-area crosswalk, eligibility criteria (including the 3,000-hour and 25% multi-modality rule), the complete 2026 fee schedule, a 10-to-14-week study plan, recertification pathways, the CNN vs CDN vs CCHT decision matrix, and the clinical calculations — Kt/V, URR, eGFR, calcium–phosphate product — you must be able to perform under exam pressure.

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Start FREE CNN nephrology nurse practice questionsPractice questions with detailed explanations

Our nephrology nursing question bank covers CKD staging, hemodialysis adequacy, peritoneal dialysis modalities, CRRT troubleshooting, transplant immunology, and electrolyte management mapped to the NNCC CNN blueprint — 100% FREE.

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What Is the CNN Certification?

CNN stands for Certified Nephrology Nurse. The credential is awarded by NNCC, a charter member of the American Board of Nursing Specialties (ABNS) and accredited by the Accreditation Board for Specialty Nursing Certification (ABSNC). NNCC works closely with the American Nephrology Nurses Association (ANNA), which develops the Core Curriculum, publishes the Nephrology Nursing Certification Review Guide, and provides the overwhelming majority of approved continuing education used for CNN maintenance.

The credential signals to employers, physicians, and patients that the holder has demonstrated specialized knowledge across modalities — a level of versatility that distinguishes CNN holders from nurses who focus solely on the dialysis chair.

2026 Program Changes Announced

In January 2026 NNCC announced, based on its 2024 national RN practice analysis, that both the CDN and CNN programs will be updated effective Summer 2026. The key practical points for 2026 candidates:

• Current exam applications remain available through 31 May 2026 under the existing blueprint described in this guide.
• Current certificants are not affected by the changes and will keep their credential on their normal 3-year recertification cycle.
• The BSN requirement will be dropped for both CNN and CDN — certification will be role-based, not education-based, reflecting that the national survey showed no meaningful knowledge difference by degree.
• Eligibility practice hours, CE requirements, and fees remain the same between the two programs.

If you are within practice-hour eligibility now, applying before 31 May 2026 under the current blueprint is the cleanest path. New blueprint details post-Summer 2026 will be published by NNCC; this guide reflects the blueprint in force through that transition.

CNN Exam Format and Structure 2026

The 2026 CNN exam is a computer-based, multiple-choice assessment delivered through C-NET-approved testing centers (and online remote proctoring for many windows). Budget your time accordingly.

Pacing Target

With 150 questions in 180 minutes, your working pace is 72 seconds per question — comfortable by CBT standards, but do not let that relaxed cadence lull you. Nephrology items frequently embed lab values and short calculations (Kt/V, URR, calcium–phosphate product, anion gap, fluid balance). A single calculation item can easily consume two minutes. Practice the math untimed in weeks 1–4, then switch to timed blocks in weeks 5+ so mental arithmetic becomes automatic.

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CNN Content Domains and Weighting 2026

The NNCC CNN blueprint organizes scored content into five content areas crossed with nine objective areas on a two-dimensional blueprint grid. Every item on the exam maps to one content area and one objective area. The content-area weights below reflect the published 2026 blueprint in force through the Summer 2026 transition.

The Nine Objective Areas

Every item is ALSO classified under one of these nine objective areas, which describe the type of nursing activity tested:

1. Pathophysiology/Complications (~18% of total test)
2. Interventions (~15%)
3. Physical/Technical (~9–11%)
4. Teaching (~14%)
5. Medications (~12%)
6. Interdisciplinary Team (~6%)
7. Psychosocial (~6%)
8. Infection Control (~12%)
9. Professional Practice (~6%)

Practically, this means the exam is heavier on what to do and how to teach it than on rote pathophysiology — about half of items test Interventions + Teaching + Medications + Infection Control combined. Candidates who over-study textbook pathophysiology and under-study patient education, medication side effects, and infection-control protocols underperform on the first attempt.

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Eligibility Criteria for CNN 2026

To sit for the CNN exam in 2026 under the current blueprint (applications open through 31 May 2026), you must satisfy all of the following. The BSN/MSN requirement is being phased out effective Summer 2026 per the January 2026 NNCC announcement:

1. Active RN license — full and unrestricted, issued by a U.S. state or territory board of nursing.
2. Baccalaureate or master's degree in nursing (current rule — being dropped Summer 2026).
3. 3,000 hours of nephrology nursing experience as an RN, within the three years prior to submitting your application. Experience may be clinical, administrative, teaching, or research in nephrology.
4. The 25% multi-modality rule — this is the trap that trips many outpatient HD nurses. Effective January 2015 and still in force in 2026, if you work in an outpatient hemodialysis facility, at least 750 hours (25%) of the 3,000 hours must come from one or more of these areas:
   • Home dialysis (home HD)
   • Home peritoneal dialysis
   • Inpatient AKI on kidney replacement therapy
   • Inpatient critical care on kidney replacement therapy
   • CKD management NOT on kidney replacement therapy
   • Kidney transplant
   • Apheresis
5. 30 contact hours of approved nephrology continuing education within the three years prior to application. CE must be approved by ANCC-COA, AACN, Council of Continuing Education, or a State Board of Nursing. Most candidates meet this through ANNA webinars, Nephrology Nursing Journal CE articles, or the ANNA National Symposium.

Who Should Choose CDN Instead?

If your practice is 100% outpatient chronic hemodialysis and you cannot document the 750 multi-modality hours, the CDN (Certified Dialysis Nurse) credential is the correct choice. CDN requires only 2,000 hours of dialysis experience in the past two years, uses the same NNCC fee structure, and focuses its blueprint on hemodialysis, AKI, post-transplant DGF, water treatment, and unit emergency planning. CNN is specifically for nurses whose practice has meaningful breadth across modalities.

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2026 CNN Fee Schedule

NNCC publishes a standard fee schedule and a reduced schedule for partners (primarily ANNA members). The 2026 figures:

The economics strongly favor becoming an ANNA member before applying. Annual ANNA dues are a small fraction of the exam-fee savings, and ANNA membership also unlocks Core Curriculum pricing, free CE, and the Nephrology Nursing Journal — all of which are directly used during prep.

Military and Employer Funding

The CNN is listed in the Department of Defense COOL (Credentialing Opportunities On-Line) programs for all active-duty branches, which means active-duty and veteran nurses may have the exam fee reimbursed. Many dialysis organizations — Fresenius Medical Care, DaVita, U.S. Renal Care — also reimburse certification fees and award clinical-ladder increases (commonly $2–$5 per hour or a lump-sum bonus) upon pass.

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Clinical Deep Dive 1: CKD Staging and eGFR

CKD staging by eGFR is tested directly and indirectly throughout the Concepts of Kidney Disease domain. Memorize the KDIGO 2024 stages cold:

The A stages (albuminuria categories — A1 <30, A2 30–300, A3 >300 mg/g) are crossed with G stages on the KDIGO heat map to produce a risk category (low, moderately increased, high, very high). Expect at least one exam item asking you to interpret a heat-map scenario and choose the appropriate follow-up interval.

The eGFR Equation

The 2021 CKD-EPI race-free creatinine equation is the current standard in the United States. You do not need to reproduce the equation, but you do need to know that a patient's eGFR can move between stages with modest creatinine changes — a 0.2 mg/dL rise in a small-build older adult can drop them from G3a to G3b. Clinical vigilance at transitions drives the correct answer on many items.

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Clinical Deep Dive 2: Hemodialysis Adequacy — Kt/V and URR

This is the single most testable calculation on the CNN exam. You must know the formulas, the targets, and the troubleshooting steps.

URR (Urea Reduction Ratio)

[ \text{URR} = \frac{\text{Pre-BUN} - \text{Post-BUN}}{\text{Pre-BUN}} \times 100% ]

Target: URR ≥ 65% for patients on standard thrice-weekly HD.

Worked example: Pre-BUN 80 mg/dL, post-BUN 24 mg/dL. URR = (80 − 24) / 80 × 100 = 70%. Adequate.

Kt/V (Daugirdas II — "single-pool" natural log formula)

The Daugirdas II natural-log Kt/V is the most commonly cited formula and the one most likely to appear on the exam:

[ Kt/V = -\ln\left(\frac{C_{post}}{C_{pre}} - 0.008 \cdot t\right) + \left(4 - 3.5 \cdot \frac{C_{post}}{C_{pre}}\right) \cdot \frac{UF}{W} ]

where C is BUN, t is dialysis session time in hours, UF is ultrafiltration volume (L), and W is post-dialysis weight (kg).

Target: Kt/V ≥ 1.2 per treatment for thrice-weekly HD (NKF KDOQI).

You are unlikely to be asked to execute the full Daugirdas II under timed pressure; you are likely to see the simpler Keshaviah "quick" form:

[ Kt/V \approx 1.162 \cdot \ln\left(\frac{\text{Pre-BUN}}{\text{Post-BUN}}\right) ]

or to be asked to interpret a reported Kt/V and decide what to change.

Adequacy Troubleshooting — The Exam Favorites

If Kt/V or URR is below target, the CNN-level nurse investigates in this order:

1. Access recirculation — most common and most testable cause. Suspect when actual URR is much lower than prescribed.
2. Treatment time shortened — patient requested to leave early, staff error.
3. Blood flow rate (BFR) too low — check actual vs prescribed, needle size, access pressures.
4. Dialysate flow rate too low
5. Clotted dialyzer / inadequate anticoagulation
6. Incorrect BUN sampling technique — post-BUN drawn incorrectly (slow-flow vs stop-flow technique matters).

Expect items that give you a Kt/V of 1.0 and ask the first nursing action — the correct answer is almost always investigate recirculation / sampling technique, not "increase time."

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Clinical Deep Dive 3: CKD-MBD and Electrolyte Math

Chronic Kidney Disease – Mineral and Bone Disorder (CKD-MBD) is one of the highest-yield subtopics in Content Area A.

The Calcium–Phosphate Product

[ \text{Ca} \times \text{PO}_4 \text{ product} = \text{Serum Ca (mg/dL)} \times \text{Serum PO}_4 \text{ (mg/dL)} ]

Target: <55 mg²/dL². Values above 55 are associated with vascular calcification and increased mortality. If you see Ca 10.2 and PO₄ 6.5, the product is 66.3 — action required: reduce phosphate (binder adjustment, dietary counseling), not raise calcium.

KDIGO Targets You Must Memorize

Phosphate Binders — Timing Is Everything

The single most-missed teaching item on the CNN exam: phosphate binders must be taken with the first bite of food, not before meals, not after. If the patient forgets and has already eaten, the binder has little effect. Memorize binder classes:

• Calcium-based (calcium acetate, calcium carbonate) — cheapest; risk is hypercalcemia.
• Non-calcium (sevelamer carbonate, lanthanum carbonate) — preferred if calcium already high or Ca×P product elevated.
• Iron-based (ferric citrate, sucroferric oxyhydroxide) — adds iron benefit, watch GI effects.

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Clinical Deep Dive 4: Vascular Access — AVF, AVG, CVC

Vascular access items cluster in Content Area B and carry disproportionate weight because access complications are the #1 cause of HD-related morbidity.

Red-Flag Signs Tested Repeatedly

• Absent thrill / no bruit → suspected thrombosis → notify nephrologist immediately, do not cannulate.
• Steal syndrome → pale, cool, painful distal extremity after access creation → reduced perfusion distal to the fistula.
• Aneurysm / pseudoaneurysm → avoid cannulating over the same site repeatedly; rotate.
• Infection at CVC exit site → erythema, drainage, fever → blood cultures from catheter and peripheral, notify provider, culture exit site.

KDOQI Vascular Access Guideline (2019 update, still in force): the phrase "Fistula First" has evolved into an individualized ESKD Life-Plan approach, but AVF remains the preferred access for most adult patients with anticipated long HD duration.

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Clinical Deep Dive 5: Peritoneal Dialysis

PD content is ~22% of the exam — do not underinvest.

Modalities

The Peritoneal Equilibration Test (PET)

PET classifies patients as high, high-average, low-average, or low transporter:

• High transporters: rapid solute transport, poor ultrafiltration with long dwells → APD with short dwells preferred.
• Low transporters: slow solute transport, good UF with long dwells → CAPD with long dwells preferred.

This transporter/modality match is a classic exam item.

Peritonitis — The #1 PD Complication Tested

Definition: Cloudy effluent + abdominal pain + PD fluid WBC >100/μL with >50% neutrophils. Culture the effluent, notify provider, start empiric intraperitoneal antibiotics (typically a first-gen cephalosporin + antipseudomonal). The nurse's role includes collecting the effluent sample aseptically, administering IP antibiotics, teaching hand hygiene, and reviewing connection technique.

Key teaching points:

• Always inspect effluent against white background — cloudy is abnormal.
• Mask + hand hygiene before every exchange.
• Exit-site care daily with gentle antibacterial cleanser.
• Flush-before-fill technique for Y-set systems reduces contamination.

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Clinical Deep Dive 6: CRRT and Acute Therapies

Content Area E (5%, 6–8 items) covers AKI and CRRT modalities. The modalities and their mechanisms are testable.

Citrate vs heparin anticoagulation for CRRT is a favorite item. Citrate chelates calcium in the circuit (regional anticoagulation); the nurse must monitor systemic ionized calcium and post-filter ionized calcium — a classic pair of labs that catches citrate toxicity if systemic ionized Ca falls and total Ca rises (widening Ca gap).

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Clinical Deep Dive 7: Transplant and Immunosuppression

Transplant is only 5% of the exam, but it is concentrated, and a well-prepared candidate can bank these items easily.

Three-Drug Maintenance Regimen (most adult kidney recipients)

1. Calcineurin inhibitor — tacrolimus (preferred) or cyclosporine. Monitor trough levels, nephrotoxicity, tremor, hyperglycemia.
2. Antiproliferative — mycophenolate mofetil (MMF) or azathioprine. Monitor WBC (myelosuppression), GI side effects.
3. Corticosteroid — prednisone (low-dose maintenance or steroid-free protocol depending on center).

Rejection Types

Nursing red flags for acute rejection: sudden rising creatinine, new-onset fever, tenderness over the graft (usually right or left iliac fossa), decreased urine output, new hypertension. Education for patients: never skip or alter doses of immunosuppressants, avoid grapefruit (CYP3A4 interaction with calcineurin inhibitors), use sun protection (increased skin cancer risk), and avoid live vaccines lifelong.

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10-to-14-Week CNN Study Plan

The CNN blueprint is broad, and the 10–14-week window matches the typical adult learner balancing full-time dialysis nursing with family obligations.

Weeks 1–2: Foundation — Concepts of Kidney Disease

• Read ANNA Core Curriculum for Nephrology Nursing (7th edition) chapters on normal kidney function, AKI, and CKD pathophysiology.
• Memorize KDIGO CKD G and A stages, eGFR equation, albuminuria thresholds.
• Complete a free CNN practice block focused on CKD concepts to identify weak spots.
• Create flashcards for CKD-MBD targets (Ca, PO₄, PTH), electrolyte ranges, and acid–base.

Weeks 3–4: Hemodialysis Mastery

• Core Curriculum HD chapters — prescription, adequacy, complications, access.
• Drill Kt/V, URR, and recirculation math until fluent.
• Access assessment: practice documenting thrill/bruit, identifying steal syndrome signs.
• Water treatment: understand RO, deionization, endotoxin filters, alarm response.
• Review KDOQI HD adequacy and vascular access guidelines.

Weeks 5–6: Peritoneal Dialysis + Home Therapies

• CAPD/APD/NIPD modality matching via PET transporter class.
• Peritonitis workup and IP antibiotic protocols.
• Exit-site care, catheter types (Tenckhoff, coiled/straight), break-in period.
• Home HD programs — frequency options, patient selection, caregiver training.

Week 7: Transplant + Acute Therapies

• Three-drug regimen side effects and monitoring.
• Rejection classification and nursing response.
• CRRT modality chart memorized (CVVH vs CVVHD vs CVVHDF vs SCUF).
• Citrate vs heparin anticoagulation monitoring.

Weeks 8–9: Pediatric, Psychosocial, Ethical, Pharmacology

• Pediatric modality considerations — weight-based prescription, growth failure, school integration.
• Psychosocial: grief, non-adherence, depression screening (PHQ-9), caregiver burden.
• Ethics: advance directives, conservative management / kidney supportive care, withdrawal of dialysis.
• Pharmacology cross-cut: ESAs (epoetin, darbepoetin), IV iron (iron sucrose, ferric gluconate, ferumoxytol), phosphate binders, calcimimetics, vit D analogs, antihypertensives in CKD.

Weeks 10–11: Integration and Full-Length Practice

• Take at least one full 150-question timed practice test per week.
• Review every incorrect answer with Core Curriculum page reference.
• Build an "error log" — recurring question types (e.g., "I always miss binder timing items") signal the highest-ROI review.

Weeks 12–14 (Buffer): Polish and Taper

• Light review of weakest two content areas.
• One more full-length timed exam 7 days before your test date.
• Final 48 hours: rest, light flashcard review of KDIGO targets, calcium–phosphate product, Kt/V targets, peritonitis definition.
• Day before: stop studying. Confirm ID, testing site directions, what to bring.

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Recommended Resources for CNN 2026

Not every resource is needed — prioritize the first two and supplement as budget allows.

1. ANNA Core Curriculum for Nephrology Nursing, 7th Edition (ANNA, 2023) — the canonical reference. If you buy one book, buy this one.
2. Nephrology Nursing Certification Review Guide, 6th Edition (Counts, 2021, ANNA) — explicitly mapped to the CNN/CDN/CNN-NP blueprint with review questions.
3. Nephrology Secrets, 4th Edition (Gomez, Elsevier) — quick review by question format, outstanding for the pathophysiology and transplant items.
4. NNCC Candidate Handbook / Certification Preparation Guide (free PDF at nncc-exam.org) — contains the blueprint grid, sample items, and a short practice test.
5. NNCC Online Practice Exam (50 questions, $50 standard, sometimes free for approved candidates) — the closest simulation of real item style.
6. KDIGO Clinical Practice Guidelines (free at kdigo.org) — CKD staging, CKD-MBD, anemia, diabetes-and-CKD, blood pressure.
7. ANNA Journal and webinars — your CE hours can double as targeted prep content.

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Common Pitfalls and How to Avoid Them

• Under-studying Content Areas D and E because they are "only 5%." Together they are 10–15% of the exam — well worth dedicated prep, especially because many ESRD-focused nurses have limited transplant/CRRT exposure.
• Over-relying on "how we do it at my unit." Your unit's protocol may differ from national guideline language. NNCC questions are written from KDIGO / KDOQI / ANNA standards, not site-specific policies.
• Ignoring the 25% multi-modality rule. Outpatient HD nurses who have never rotated into home, transplant, AKI/CRRT, or CKD clinic may find their hours ineligible despite exceeding 3,000. Document multi-modality hours carefully.
• Forgetting binder timing and phosphate teaching. Teaching items are disproportionately represented (~14% of the exam); binder timing is a near-certain appearance.
• Weak calculations. If you can't execute URR mentally in under 20 seconds, your test-day pacing will suffer.
• Skipping infection control. 12% of items — heavier than peritoneal dialysis on a per-objective basis. Hand hygiene, exit-site care, CVC bundle, isolation for HCV/HBV/MRSA all testable.

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Test-Day Tips

• Arrive 30 minutes early to complete check-in, palm scan, and locker. The C-NET process is strict about identification.
• Two forms of ID — one government photo, one secondary. Name must exactly match your NNCC application.
• No calculator is provided on most forms — you'll have whiteboard/scratch paper. Practice mental math for the URR and Ca×P product computations you will do on test day.
• First pass: answer everything you know quickly. Flag anything requiring calculation for the second pass.
• Second pass: calculations and long stems. Budget roughly 60 minutes.
• Third pass: review flagged items only. Change answers only with a concrete reason — first instincts are usually correct on well-written items.
• Eat a real breakfast. Three hours of concentration on a light stomach is harder than most candidates expect.

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Recertification: Keeping Your CNN Active

CNN is valid for three years. You have two paths to renewal:

Path 1: Recertification by Continuing Education (most common)

• 45 contact hours of approved nephrology continuing education in the previous three-year cycle (the 60 figure you'll see in some old forums referred to CNN-NP historically and has been updated; verify your current cycle on your NNCC portal).
• 1,500 hours of RN work experience in nephrology in the previous three years.
• Maintain active, unrestricted RN licensure.
• Submit the recertification application and fee.
• Apply at least 3 months before expiration — NNCC processing can take up to 8 weeks, and your certificate will lapse if you miss the postmark deadline of the last day of your expiration month.

Path 2: Recertification by Examination

• Re-take the current CNN exam.
• Same eligibility requirements as first-time candidates.
• Useful for certificants returning after a work-experience gap that disqualifies the CE pathway.

Emeritus Status

Certificants over age 50 who previously held an NNCC credential and are no longer actively practicing nursing may apply for CNN-Emeritus — a recognition status that preserves your credential history without requiring ongoing CE.

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CNN vs CDN vs CCHT vs CNN-NP: The NNCC Credential Map

Decision rule: If you cross modalities and want the most portable credential for career flexibility, choose CNN. If you are a dedicated HD nurse, choose CDN. Both carry equivalent prestige; they reflect different practice scopes.

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Career and Salary Outlook 2026

Nephrology nursing is a high-demand specialty with durable growth drivers — aging population, diabetes/hypertension prevalence, and the CMS Kidney Care Choices and ETC models that tie reimbursement to home therapy growth.

2026 Salary Snapshot

According to PayScale's 2026 data and the major dialysis employers' public postings:

• Nephrology RN (non-certified) median: $78,000–$92,000
• CNN-certified RN median: $95,000–$115,000 (certification premium ~10–15%)
• Home therapy / PD coordinator RN: $98,000–$120,000
• Dialysis clinic manager (CNN preferred): $105,000–$135,000
• Transplant coordinator RN: $100,000–$135,000
• Nephrology NP (CNN-NP): $110,000–$150,000

Metropolitan areas on the coasts, Alaska, and Hawaii consistently pay above the national median. Travel nephrology nurses often clear $2,200–$2,800/week plus stipends in high-demand markets.

Employer Landscape

• Fresenius Medical Care — largest U.S. dialysis provider; strong CNN clinical-ladder structure.
• DaVita — second-largest; reimburses certification and awards lump-sum pass bonuses.
• U.S. Renal Care — mid-size operator; often faster clinical-ladder promotion.
• Hospital-based inpatient dialysis / CRRT — typically pays above the outpatient median for 12-hour shifts.
• Transplant centers — university-affiliated programs; CNN + BSN strongly preferred historically.

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Related NNCC and ANNA Credentials to Plan For

• CDN → CNN: many nurses start with CDN in their first two years and upgrade to CNN once they accumulate multi-modality hours.
• CNN → CNN-NP: if you complete an MSN/DNP nurse practitioner program with nephrology focus.
• CNN + CNE / CNEcl (NLN): for nephrology nurses moving into education.
• CNN + NE-BC (ANCC): for nephrology nurses moving into leadership/management.
• CNN + CCRN (AACN): complementary for inpatient CRRT / acute nephrology RNs.

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Final Thoughts: Is the CNN Worth It in 2026?

For the RN whose practice genuinely spans modalities — a nurse who can move between an HD chair, a home PD training visit, a transplant education session, and an ICU CRRT bedside with equal confidence — CNN is the credential that validates that breadth. It is harder to earn than CDN, it is more portable across roles, and its salary premium has held steady at 10–15% for the last five years. The 2026 program changes coming this summer — dropping the BSN requirement and updating the blueprint based on the 2024 practice analysis — make CNN more accessible to ADN-prepared nephrology nurses who have built practice depth through years of clinical work. If you are eligible under the current blueprint, applying before 31 May 2026 keeps you on the predictable, well-documented path covered in this guide.

nephrology nursing practice question bankPractice questions with detailed explanations