CDI Requirements 2026: Eligibility, Prerequisites & How to Qualify

CDI Requirements Overview

Becoming a Certified Deaf Interpreter involves two separate organizations working together. The Registry of Interpreters for the Deaf (RID) owns and enforces the eligibility requirements - the degree, the audiogram, the membership status. The Center for the Assessment of Sign Language Interpretation (CASLI) builds and administers the actual exams. That split matters because it means "requirements" and "exam content" are governed by different bodies with different rules, deadlines, and fee structures. If you're just getting oriented to the credential itself, our overview of CDI Certification and the plain-language explainer on What Is CDI Certification? are good starting points before diving into the mechanics below.

This guide walks through every prerequisite you must satisfy before you can even register for the CASLI Generalist Knowledge Exam (CGKE), what happens between the knowledge exam and the performance exam, and how fees, retakes, and the five-year testing cycle interact. If you already know the basics of what the letters mean, skip ahead - but if you're still asking What Does CDI Stand For? or want a refresher on CDI Meaning, those companion pieces cover the terminology in depth.

Education Prerequisite: Degree or Alternative Pathway

RID's core education requirement is straightforward on paper: a bachelor's degree in any field. It does not need to be in interpreting, Deaf studies, or linguistics - any accredited bachelor's degree satisfies this prong.

For candidates without a four-year degree, RID's Alternative Pathway, effective May 17, 2021, provides a second route to eligibility. This pathway was introduced specifically to prevent qualified Deaf professionals from being shut out of certification purely because of degree access barriers, which historically affected Deaf candidates disproportionately.

Notably, RID removed the 40-hour Deaf-interpreter training requirement in June 2021. Before that change, candidates needed a documented 40-hour training block in addition to education credentials. Removing it was explicitly framed as an equity move, aligning Deaf-interpreter eligibility more closely with the requirements already in place for hearing interpreters.

The Audiogram Requirement

To qualify for Deaf-interpreter rates and eligibility specifically, you must submit an audiogram documenting hearing loss of 65db or more in one or both ears. This is one of the more overlooked administrative steps, so it's worth spelling out the fine print:

• The audiogram does not need to be recent - an older audiogram is acceptable as long as it clearly documents the required threshold.
• It must name the applicant directly - generic or anonymized reports won't be accepted.
• It must also name the audiologist or office that performed the test, so RID can verify its source if needed.

If you had a childhood or early-adulthood audiogram on file with a school, clinic, or audiology practice, it's worth requesting a copy now rather than waiting until you're mid-registration. Losing weeks to paperwork retrieval is a common, entirely avoidable delay.

CASLI Generalist Knowledge Exam Structure

The legacy CDI-Knowledge Exam retired on January 1, 2021. Everyone pursuing certification today takes its replacement, the CASLI Generalist Knowledge Exam (CGKE), a computer-based test delivered through Meazure Learning (formerly Scantron) at contracted testing sites. The CGKE has two distinct parts, and understanding their format is essential to eligibility planning:

This split-retake structure is a meaningful detail: if you pass Fundamentals but fail the Ethical Decision Making and Cultural Responsiveness Exam (or vice versa), you only need to retake the failed portion, not the entire CGKE. That single-part retake is priced separately from the full exam fee, which we cover below.

For a deeper breakdown of how the exam's structure translates into a study plan, see our full CDI Study Guide 2026: How to Pass on Your First Attempt, and for a candid assessment of where candidates typically struggle, read How Hard Is the CDI Exam? Complete Difficulty Guide 2026.

Performance Exam Eligibility

Passing Fundamentals of Interpreting is the gatekeeper for performance-exam eligibility - you cannot schedule the performance exam until that portion is complete, regardless of where you stand on the Ethical Decision Making and Cultural Responsiveness Exam.

Once eligible, the CASLI Generalist Performance Exam for CDI is scheduled directly with a Local Test Administrator, rather than through a centralized testing vendor like the knowledge exam. This means logistics - location, timing, availability - vary more than they do for the CGKE, so it pays to start looking into administrators in your region as soon as you clear Fundamentals.

Results timing differs sharply between the two exam types:

• Knowledge exam (CGKE) results: within 10 business days
• Performance exam results: within 90 days

That 90-day window is worth building into any personal or employment planning - don't assume performance results will arrive quickly just because the knowledge exam did.

Fees, Retakes, and Testing Cycle Rules

CDI-rate exam fees, effective January 1, 2023, break down as follows:

A few procedural rules affect how these fees actually play out:

• Failed knowledge exams require a three-month waiting period before you can retake that section.
• Exams must be taken within one year of purchase or before the testing cycle expiration - whichever limit hits first.
• The full testing cycle is five years, counted from your first PASS notification, not from your registration date.

These deadlines interact in ways that trip people up. If you pass Fundamentals in year one but wait too long to attempt the performance exam, you could run into your five-year cycle expiring before you're actually certified. For a granular cost comparison across every fee scenario, see CDI Certification Cost 2026: Complete Pricing Breakdown, and if you're weighing whether the investment makes sense against long-term earning potential, CDI Salary Guide 2026: Complete Earnings Analysis and Is the CDI Certification Worth It? Complete ROI Analysis 2026 both address that question directly.

Bridge Plan for Legacy CDI-Knowledge Exam Holders

If you passed the retired CDI-Knowledge Exam before its January 1, 2021 retirement, you are not automatically caught up to current standards. RID requires a bridge plan consisting of two components:

• An unscored learning module
• The Case Studies gap test (the Ethical Decision Making and Cultural Responsiveness portion)

The reason for this bridge is structural, not punitive: the old CDI-Knowledge Exam was built on RID's 2000 Role Delineation Study, while the current CASLI Generalist Performance Exam for Deaf Interpreters - released November 16, 2020 - is built on CASLI's 2018 Deaf Interpreter Job Task Analysis. Those two frameworks reflect nearly two decades of change in how the Deaf-interpreter role is actually defined and practiced, so RID requires legacy-exam holders to demonstrate familiarity with the updated framework before proceeding to the current performance exam.

What the Domains Mean for Eligibility Prep

Once you've cleared the education, audiogram, and exam-registration prerequisites, your actual preparation should map to the four domains that structure both the knowledge and performance exams:

These four domains aren't abstract categories - they directly shape both knowledge-exam question scenarios and the case-study format of the Ethical Decision Making and Cultural Responsiveness Exam. For a domain-by-domain breakdown with study priorities for each, see CDI Exam Domains 2026: Complete Guide to All 4 Content Areas. If you want a sense of exactly what score you need across these domains to pass, CDI Passing Score 2026: Exactly What You Need to Pass breaks that down as well.

Scheduling Your Requirements Timeline

Given the retake waiting periods and the five-year cycle, it helps to sequence your prerequisites deliberately rather than tackling them all at once.

Throughout this process, running through realistic scenario-based questions on our CDI practice test platform can help you gauge readiness before you commit to exam fees. Since knowledge-exam retakes carry a three-month waiting period, it's worth testing your recall against domain-specific material on the practice site before your first attempt rather than after a failed one. If you're still deciding whether this credential fits your career path at all, CDI Jobs and CDI Training offer useful context on what hiring and preparation actually look like once you're certified.

Frequently Asked Questions