- What Is NDD, Exactly?
- Who Hires NDD-Certified Physicians
- Exam Format and Question Style
- The 16 Content Domains
- Dimension 2: The Competency Overlay
- Eligibility and Training Pathways
- Cost, Dates, and Registration Mechanics
- Scoring and Pass Rate Context
- After You Pass: Continuing Certification
- A Domain-Aware Study Approach
- Frequently Asked Questions
- NDD here means Certification in Neurodevelopmental Disabilities, issued by the ABPN.
- The exam has 200 questions spanning 16 Dimension 1 content domains at Pearson VUE centers.
- The next initial exam window is October 18-22, 2027; applications open December 22, 2026.
- Published initial subspecialty fee is $1,900, with a $500 late application fee.
What Is NDD, Exactly?
NDD stands for Certification in Neurodevelopmental Disabilities, a subspecialty credential administered by the American Board of Psychiatry and Neurology, Inc. (ABPN). It is a distinct board certification for physicians who evaluate and manage children and adults with disorders that affect brain development - things like autism spectrum disorder, cerebral palsy, learning disabilities, and genetic syndromes with neurodevelopmental features. If you've landed on this page trying to sort out what the acronym means in a clinical training or exam context, this article and its companion piece, What Is NDD?, both center on this exact credential and no other.
Because "NDD" is used by several unrelated fields, it's worth being precise: this site, and every fact in this article, refers only to the ABPN's Neurodevelopmental Disabilities certification. For a broader breakdown of the acronym itself, see NDD Meaning and What Does NDD Stand For?.
Who Hires NDD-Certified Physicians
NDD-certified physicians typically practice in academic medical centers, children's hospitals, developmental-behavioral clinics, and multidisciplinary neurodevelopmental programs. Because eligibility runs through child neurology, most candidates are already practicing child neurologists who want formal recognition - and often a leadership role - in diagnosing and managing complex neurodevelopmental presentations: genetic syndromes, motor disabilities, cognitive impairment, and overlapping psychiatric conditions. Hospital systems building autism centers, cerebral palsy clinics, or complex-care programs frequently look for this certification when recruiting medical directors. For a closer look at practice settings and career paths, see NDD Jobs.
Exam Format and Question Style
The NDD exam is a computer-based, proctored test delivered at Pearson VUE testing centers. According to the certification content specifications dated December 4, 2025, the exam contains 200 questions. Questions are single-best-answer, clinically framed items - expect vignette-style stems describing a patient's developmental history, exam findings, and sometimes imaging or lab data, followed by a question asking for the most likely diagnosis, next diagnostic step, or best management approach.
This format rewards candidates who can quickly connect a clinical picture to a specific neurodevelopmental disorder category rather than memorizing isolated facts. A detailed walkthrough of question patterns and preparation strategy is available in the NDD Study Guide 2026: How to Pass on Your First Attempt.
The 16 Content Domains
ABPN organizes exam content into 16 Dimension 1 domains - essentially the disorders and topic areas the exam draws from. Each domain carries a percentage range indicating its approximate share of the 200 questions. Four domains share the highest weighting: Genetic and developmental disorders, Cognitive disorders, Autism spectrum disorder, and Motor disabilities, each at 8-10%.
High-Weight Domains (8-10% each)
These four domains together account for a substantial share of the exam and deserve proportionally more study time.
- Genetic and developmental disorders
- Cognitive disorders
- Autism spectrum disorder
- Motor disabilities
Mid-Weight Domains (5-9% each)
- Learning disabilities (7-9%)
- Attention-deficit and disruptive behavior disorders (7-9%)
- Communication disorders (6-8%)
- Neurodevelopmental disorders associated with major medical conditions (5-7%)
- Questions not associated with a specific neurologic disorder (5-7%)
Lower-Weight Domains (1-6% each)
- Normal development (4-6%)
- Developmental psychiatric disorders (4-6%)
- Neuro-ophthalmologic and neuro-otologic disorders (4-6%)
- Brain and spinal trauma (4-6%)
- Disorders due to toxins, drugs, and physical agents (4-6%)
- Epilepsy and episodic disorders (1-3%)
- Neuroimmunologic and paraneoplastic CNS disorders (1-3%)
Every one of these domains, with sample question themes and suggested emphasis, is broken down in depth in the NDD Exam Domains 2026: Complete Guide to All 16 Content Areas.
Dimension 2: The Competency Overlay
It's important to understand that ABPN does not create two separate question sets. Instead, the same 200 questions that map to the 16 Dimension 1 domains are also tagged against eight overlapping Dimension 2 competencies. These are not additional exam sections and their percentages should never be added on top of Dimension 1 weights - they describe the same items from a different angle.
| Dimension 2 Competency | Approximate Weight |
|---|---|
| Clinical aspects of neurologic disease | 44-46% |
| Diagnostic procedures | 14-16% |
| Treatment/Management | 15-17% |
| Neuroscience and mechanism of disease | 12-14% |
| Systems-based practice | 2-4% |
| Interpersonal and communication skills | 3-5% |
| Professionalism | 1-3% |
| Practice-based learning and improvement | 1-3% |
Key Takeaway
Treat Dimension 1 as "what disorder" and Dimension 2 as "what kind of clinical reasoning" - the heavy weight on clinical aspects of neurologic disease (44-46%) signals that most questions test applied diagnosis and management rather than pure basic science.
Eligibility and Training Pathways
Candidates must hold ABPN certification in Neurology with Special Qualification in Child Neurology by December 31 of the year preceding the exam. They also need approved NDD training and an unrestricted medical license, with both training and licensure requirements complete by July 31 of the examination year.
Two approved routes exist: completing a dedicated NDD training track, or completing a child-neurology residency followed by NDD fellowship training. Notably, ABP general pediatrics certification has not been required as a prerequisite since 2024, which has simplified the pathway for neurology-trained candidates. Full eligibility mechanics, including documentation timing, are covered in NDD Requirements 2026: Eligibility, Prerequisites & How to Qualify, and training-track specifics are detailed in NDD Training.
Cost, Dates, and Registration Mechanics
The next initial NDD examination is scheduled for 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 triggers the late application fee.
The published initial subspecialty fee is $1,900 USD, and the late application fee is an additional $500 USD. Candidates should build these dates into their planning calendar well ahead of the application window opening. For a fee-by-fee breakdown, visit NDD Certification Cost 2026: Complete Pricing Breakdown, and for the full testing calendar see NDD Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Scoring and Pass Rate Context
NDD uses criterion-referenced scoring, meaning candidates are measured against a fixed passing standard rather than against each other, and that standard is equated across different exam versions so difficulty differences don't disadvantage any test date. Details on how the passing standard is set and what it means for your target score are in NDD Passing Score 2026: Exactly What You Need to Pass.
The first-time pass rate was 100% (15/15) in 2025, while the official 2021-2025 first-time aggregate was 88% (30/34). Because annual cohorts for this subspecialty are small, these figures should be read as historical context rather than a prediction for any individual candidate. A deeper analysis of these numbers and what drives year-to-year variation appears in NDD Pass Rate 2026: What the Data Shows, and a broader difficulty assessment is available in How Hard Is the NDD Exam? Complete Difficulty Guide 2026.
After You Pass: Continuing Certification
Passing the initial exam is not the end of the certification lifecycle. ABPN's continuing certification operates on three-year blocks, requiring active unrestricted licensure, 90 Category 1 CME credits, fulfillment of a 16-credit self-assessment requirement, and one Performance in Practice (PIP) activity for clinically active diplomates.
Diplomates can satisfy the self-assessment piece through successful participation in Article-Based Continuing Certification (ABCC) - but ABCC does not eliminate the 90-credit CME requirement; it only covers the self-assessment component. Assessment pathways are either 20 successfully completed ABCC article examinations per certification per three-year block, or the traditional ten-year continuing-certification examination. These are distinct from initial-certification preparation, and question banks for one should not be mixed with the other.
A Domain-Aware Study Approach
Rather than a generic study calendar, an effective NDD prep plan allocates time in proportion to domain weight. Since Genetic and developmental disorders, Cognitive disorders, Autism spectrum disorder, and Motor disabilities each carry 8-10% of the exam, they merit the longest study blocks. Lower-weight domains like Epilepsy and episodic disorders or Neuroimmunologic and paraneoplastic CNS disorders (1-3% each) still need review, but shorter sessions suffice.
High-Weight Domains
- Genetic and developmental disorders, cognitive disorders
- Build diagnostic frameworks for common syndromes
Autism and Motor Domains
- Autism spectrum disorder criteria and comorbidities
- Motor disabilities including cerebral palsy subtypes
Mid-Weight Domains
- Learning disabilities, ADHD and disruptive behavior disorders
- Communication disorders and associated medical conditions
Lower-Weight and Mixed Review
- Trauma, toxins, neuro-ophthalmology, epilepsy, neuroimmunology
- Full-length practice sets covering Dimension 2 reasoning skills
Techniques like spaced repetition work well when applied to this domain structure - reviewing high-weight domains more frequently across the study period rather than once and moving on. For a full week-by-week plan, see the NDD Study Guide 2026: How to Pass on Your First Attempt. You can also build familiarity with the question style using timed practice sets on the main practice test site, which mirrors the vignette format candidates encounter on exam day.
Key Takeaway
Spend roughly proportional time to domain weight, but don't skip low-weight domains entirely - even a 1-3% domain represents several questions on a 200-item exam.
Whether NDD certification is worth the investment of time, training, and the $1,900 fee depends on career goals; that tradeoff is examined in Is the NDD Certification Worth It? Complete ROI Analysis 2026, and earnings context is covered in NDD Salary Guide 2026: Complete Earnings Analysis. Once you're ready to start applying domain knowledge to timed questions, practice testing is one of the most direct ways to gauge readiness before application deadlines arrive.
Frequently Asked Questions
Certification in Neurodevelopmental Disabilities, an ABPN subspecialty certification for physicians. See What Does NDD Mean? for more on the terminology.
Physicians who hold ABPN certification in Neurology with Special Qualification in Child Neurology by December 31 of the prior year, have completed approved NDD training, and hold an unrestricted medical license by July 31 of the exam year.
The certification content specifications dated December 4, 2025 specify 200 questions, covering 16 Dimension 1 domains and mapped to eight Dimension 2 competencies.
The published initial subspecialty fee is $1,900 USD. A late application incurs an additional $500 USD fee.
The next initial examination window is 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.