IDD/MI Dual Diagnosis Clinical Certification

Developed in association with The National Association of State
Directors of Developmental Disabilities Services (NASDDDS)

NADD developed the NADD Competency-Based IDD/MI Dual Diagnosis Clinical Certification Program to improve the quality and effectiveness of services provided to individuals with a dual diagnosis through the development of competency-based professional standards and through promoting ongoing professional development. 

Clinical certification through NADD validates and provides assurance to people receiving services, professional colleagues, employers, and third-party payers that a clinician has met the standards established by NADD for providing services to individuals with IDD/MI. Certification attests to the clinician’s competency in providing these services.  

Clinicians who receive NADD certification will be entitled to use “NADD-CC” as a credential.  

A Clinician in the field of dual diagnosis is defined as an individual who provides clinical supports or services for persons with intellectual/developmental disabilities and mental health needs.

An overview of the Clinical Certification Program is available below, and in the Executive Summary

For greater detail, see our Prerequisites & Application Information page (linked below) or consult the Program Manual

The Clinician seeking certification is required to demonstrate mastery of five competency areas.

Getting Started

Getting started in NADD’s Clinical Certification Program is easy, and we’ve summarized each step in the process below.

For the full program requirements and details on each step in the process, click the link below to visit our Prerequisites and Application Information page to familiarize yourself with the details of NADD Certification.

NADD is here to answer your questions, help meet your specific needs, and provide information throughout the process: email us at

Individual applicants to our Certification Program will follow the process outlined below.

Organizations with multiple staff to certify may also follow this process on a case-by-case basis, and may benefit from coordinated assistance from NADD if they wish to pay by check for multiple certifications and ensure their staff are enrolled and processed smoothly.

Payments made outside our online system must be accompanied by a complete roster of staff seeking certification.

Certification application fees are non-refundable and non-transferable once an application is received and expire 12 months from the date of payment.

Please contact us at with questions.

Steps in the Process

  1. Establish NADD Membership
    NADD Membership is a requirement for certification, and all employees of organizations with a NADD Organizational Membership receive member benefits through their employer. Membership Status is documented on your application and confirmed as we process your submission.

    If you’re not yet a NADD Member  –  JOIN US!

  2. Pay your Application Fee Online 
    Once your Application Fee has been paid, a link to our Certification Guide with access to our online application will be available on the confirmation screen (click for example), and via confirmation email (click for example).

    NADD tiers our application fees to accommodate both Accredited and Non-Accredited Programs.

    To check if your program is NADD-Accredited, please visit our NADD-Accredited Programs Registry or to pay your Application Fee visit our  NADD Store.

  3. Submit your Application
    You’ll  find all the information about what you need for a successful application on our Prerequisites and Application Information page.

  4. Complete the Certification Process
    Once your application has been completed and accepted NADD will guide you through the certification process. You’ll find all the information necessary for successfully completing certification on our Prerequisites and Application Information page.

  5. Enjoy the Benefits of NADD Certification
    NADD Certification is valid for 2 years, and entitles you to the credential NADD-CC as a mark of your achievement.

  6. Recertification
    Renewing your NADD Certification is easy, just pay your Recertification Application Fee for access to our online application to document your continuing education.