NDD Pass Rate 2026: What the Data Shows

What the NDD Pass-Rate Numbers Actually Say

If you searched for this page, you probably want one number. Here are the two that exist in ABPN's published data for the Certification in Neurodevelopmental Disabilities exam: the 2025 first-time pass rate was 100% (15/15), and the official five-year aggregate for 2021-2025 first-time takers is 88% (30/34). That's it. There is no larger public dataset, no state-by-state breakdown, and no demographic slicing published for this subspecialty.

Both figures come directly from ABPN's first-time-taker five-year pass-rate report, not from a third-party estimate. Anyone quoting a different NDD pass-rate figure is either rounding aggressively or, more likely, has confused this credential with one of the other professional acronyms that also use "NDD." This site covers exactly one credential - see What Is NDD? and NDD Meaning if you landed here from a different context.

Why Small Cohorts Change How You Should Read This Data

Fifteen candidates. Thirty-four candidates. These are the actual denominators behind the numbers above, and they matter more than the percentages themselves. When a cohort is this small, a single candidate's result moves the published rate by several percentage points. That's why ABPN's own documentation states plainly that these small cohorts should not be treated as predictions of an individual candidate's result.

Practically, this means you cannot use last year's national pass rate to estimate your own odds the way you might with a high-volume exam that tests thousands of people annually. Your actual probability of passing depends on your specific preparation against the specific content specifications - not on which testing year you happen to sit in. That's a more useful (if less satisfying) way to think about the number.

How ABPN Sets the Passing Standard

The NDD exam uses criterion-referenced scoring. That means you are not competing against other test-takers, and there is no fixed percentage of candidates who are "meant" to fail. Instead, ABPN sets a passing standard tied to the knowledge and skills required for competent practice, and that standard is equated across examination versions so that a harder form of the exam doesn't unfairly penalize the candidates who happen to sit for it.

This is an important distinction if you're trying to reverse-engineer a "safe" score. There isn't a moving target based on how everyone else performs that year. For a full breakdown of how the numeric threshold is derived and what it means for your preparation, see NDD Passing Score 2026: Exactly What You Need to Pass.

Who Sits for the NDD Exam - and Why It Matters

Pass rates are a function of who takes the exam, not just how the exam is written. The NDD candidate pool is narrow by design. To sit for initial certification, a candidate must hold ABPN certification in Neurology with Special Qualification in Child Neurology by December 31 of the preceding year, complete approved NDD training, and hold an unrestricted medical license - with training and licensure requirements finalized by July 31 of the examination year.

Approved paths into that training are the dedicated NDD training track and the child-neurology residency followed by NDD fellowship training route. Notably, ABP general pediatrics certification has not been required as a prerequisite since 2024, which has changed who is eligible to pursue this pathway. For the complete eligibility breakdown, including how the two approved training routes differ, see NDD Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Because every candidate has already cleared child-neurology board certification and a structured fellowship before ever registering for this exam, the pool is pre-filtered for competence in a way that broader entry-level exams are not. That context is part of why the aggregate pass rate sits where it does - and why it still shouldn't be treated as a guarantee.

The Domains That Drive Most of the Difficulty

The content specifications (dated December 4, 2025) organize the exam into 16 Dimension 1 domains - the disorders and topics tested - while the same 200 questions also map to eight overlapping Dimension 2 competencies (things like clinical aspects of disease and diagnostic procedures). These are two views of the same question bank, not two separate sections, so don't try to add their percentages together when planning your study time.

Four Dimension 1 domains share the highest weight in the specification, at 8-10% each:

The remaining twelve domains - Normal development, Learning disabilities, Communication disorders, Attention-deficit and disruptive behavior disorders, Developmental psychiatric disorders, Neuro-ophthalmologic and neuro-otologic disorders, Neurodevelopmental disorders associated with major medical conditions, Brain and spinal trauma, Epilepsy and episodic disorders, Neuroimmunologic and paraneoplastic CNS disorders, Disorders due to toxins/drugs/physical agents, and general questions not tied to a specific neurologic disorder - each carry lighter individual weight but collectively make up more than half the exam. Underestimating them is a common mistake. For the full weight table and a walkthrough of all 16 areas, see NDD Exam Domains 2026: Complete Guide to All 16 Content Areas.

Exam Format and Registration Mechanics That Affect Results

Format familiarity is a controllable variable in your outcome. The NDD exam is a 200-question, computer-based, proctored exam delivered at Pearson VUE testing centers. Candidates who haven't sat for a proctored, computer-based subspecialty exam recently should factor in time to get comfortable with the interface and pacing well before test day, not the week of.

Cost and deadlines also shape who ultimately sits for the exam prepared versus rushed. The published initial subspecialty fee is $1,900, with a $500 late application fee for candidates who miss the regular deadline. For the next administration - October 18-22, 2027 - applications open December 22, 2026, with a regular deadline of April 22, 2027 and a late deadline of April 29, 2027. Missing the regular deadline doesn't just cost money; it compresses your remaining preparation window. Full cost breakdowns live at NDD Certification Cost 2026: Complete Pricing Breakdown, and the complete registration calendar is at NDD Exam Dates 2026: Testing Windows, Deadlines & Scheduling.

A Study Sequence Built Around Pass-Rate Risk

Given that pass-rate risk concentrates around content gaps rather than exam-day surprises, the most efficient use of a multi-month study window is to front-load the heaviest domains and leave lighter, narrower domains for later consolidation. A simple sequencing approach:

Spaced repetition on high-yield diagnostic criteria and interleaved practice questions across domains - rather than studying one domain to exhaustion before moving on - tends to mirror how the exam actually mixes topics within a single sitting. A structured week-by-week plan, including how to fold in the eight Dimension 2 competency areas, is laid out in NDD Study Guide 2026: How to Pass on Your First Attempt. If you want a candid assessment of where the exam gets genuinely hard versus where preparation closes the gap, read How Hard Is the NDD Exam? Complete Difficulty Guide 2026. And for last-week review, a condensed one-page reference is available at NDD Cheat Sheet 2026: One-Page Review of Must-Know Facts.

Running full-length, timed question sets on our practice test platform before test day is one of the few ways to simulate the 200-question pacing without waiting for the real exam. Working through domain-tagged questions on the main practice site also lets you see, in real time, which of the 16 domains needs another pass.

2025 vs. the Five-Year Aggregate: Side by Side

The comparison underscores the same point twice: small numbers move fast. A single additional pass or fail in a 15-person cohort swings the annual rate by roughly six to seven percentage points. Don't anchor your confidence - or your anxiety - to whichever single-year number you happened to find first.

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