Two national boards, two different exam structures, and overlapping — but not identical — language coverage. What CoreCHI/CHI and Hub-CMI/CMI actually require, verified against each board's own materials.
Ask ten interpreters which certification to get and you'll hear two answers, both defended fiercely: CCHI or NBCMI. Both are legitimate, nationally recognized paths into certified medical interpreting in the US, and neither is a scam or a lesser choice — they're built differently, test differently, and cover different languages at the oral level. The right one depends less on which board is 'better' and more on your working language, your training path, and what the agencies or hospitals you want to work for actually ask for. Here's what each one actually requires.
CCHI (the Certification Commission for Healthcare Interpreters) and NBCMI (the National Board of Certification for Medical Interpreters) are the two organizations that certify medical interpreters nationally in the United States. Neither is a training program — both assume you already have working proficiency in two languages and some grounding in healthcare interpreting before you sit for their exams. And they aren't mutually exclusive: plenty of interpreters end up holding a credential from each board over a career, usually because a specific employer or contract asked for it.
| CCHI | NBCMI | |
|---|---|---|
| Entry credential | CoreCHI — language-neutral knowledge exam | Hub-CMI — language-neutral written exam |
| Full oral credential | CHI — Spanish, Arabic, or Mandarin only | CMI — Spanish, Mandarin, Cantonese, Russian, Vietnamese, or Korean |
| Training prerequisite | About 40 hours of healthcare interpreter training | About 40 hours of medical interpreter training |
| NCCA accreditation | CoreCHI, CoreCHI-P, and CHI-Spanish are NCCA-accredited, per CCHI | Not NCCA-accredited, per CCHI's comparison of the two boards |
| Renewal cycle | Every 4 years, with CE hours | Hub-CMI every 4 years; CMI every 5 years, both with CE hours |
CCHI's path has two tiers. CoreCHI is a language-neutral knowledge exam — about 100 multiple-choice questions in English, with a 2-hour limit, open to interpreters of any language pair. It covers five domains: professional responsibility and ethics, managing the interpreting encounter, healthcare terminology, U.S. health systems, and cultural responsiveness. It tests what you know about the job, not how you perform it across two languages.
The oral tier, CHI, is language-specific and — as of this writing — available only for Spanish, Arabic, and Mandarin. Candidates must pass CoreCHI first, then complete the CHI oral performance exam within 12 months. It's built around eight performance items and, per CCHI's own program description, tests consecutive and simultaneous interpreting, sight translation, and translation — a broader set of modes than the knowledge exam alone covers.
NBCMI's structure mirrors CCHI's two-tier shape, with different scope. Hub-CMI is the written, language-neutral entry credential — an English-language exam open to any language combination, and the required first step before an oral exam. CMI, the full credential, adds a language-specific oral exam, but only for six languages: Spanish, Mandarin, Cantonese, Russian, Vietnamese, and Korean.
Per NBCMI's own candidate handbook, the CMI oral exam breaks down roughly as: 35% medical terminology in context, 30% linguistic mastery in English and the target language, 25% consecutive interpreting and sight translation from English into the target language, and 10% cultural awareness. Worth noting for anyone weighing the two boards: NBCMI's oral exam does not include simultaneous interpreting or sight translation into English, while CCHI's CHI exam tests both.
Between them, CCHI and NBCMI offer a full oral credential in exactly seven languages total — Spanish and Mandarin appear on both boards' lists, plus Arabic (CCHI only) and Cantonese, Russian, Vietnamese, and Korean (NBCMI only). If you work in a language outside that set — Haitian Creole, Somali, Portuguese, Tagalog, and dozens of others in real demand at hospitals — neither board currently offers a language-specific oral exam for you.
If you work in Spanish or Mandarin, both boards offer a full oral credential — the choice comes down to the factors below. Arabic points you to CCHI; Cantonese, Russian, Vietnamese, or Korean point you to NBCMI. Everything else starts with the language-neutral credential from either board.
Job postings and agency contracts are the real filter, not personal preference — some hospital systems and language service companies name one board specifically, but most accept either. Skim postings from the agencies and employers on our interpreting agency directory before you commit to a training path.
CCHI's CHI tests simultaneous interpreting; NBCMI's CMI oral doesn't. If your target work leans heavily on simultaneous interpreting, that's a real difference in what you'll have practiced by the time you're certified.
CCHI credentials and NBCMI's Hub-CMI both renew every four years; NBCMI's CMI renews every five. Neither is free of continuing-education requirements — budget the CE hours into your plan from the start rather than scrambling near expiration.
Neither board's exam prep, nor the credential itself, is something Unicaption can shortcut — that part is on you. What changes once you're doing the work is having something reliable running beside the call:
You get 30 free minutes every week, no credit card — enough to try it on real calls once you're working, certified or not. For a closer look at what training path CCHI and NBCMI both assume you've completed, see medical interpreter pay and what moves it, and for a run-through before your next assignment, our interpreter prep checklist.
Neither board is objectively better — they're built differently. CCHI's CHI credential covers Spanish, Arabic, and Mandarin and includes simultaneous interpreting in its oral exam; NBCMI's CMI covers Spanish, Mandarin, Cantonese, Russian, Vietnamese, and Korean and focuses its oral exam on consecutive interpreting and sight translation. Most hospitals and language service agencies accept either credential, so the practical answer usually comes down to your working language and what a specific employer asks for.
Yes. Nothing prevents an interpreter from earning credentials with both boards, and some do — often because different employers or contracts over a career asked for different ones. There's no conflict in holding both; the main cost is the training and renewal requirements each board maintains separately.
CCHI and NBCMI together offer a full oral credential in seven languages: Spanish, Mandarin, Arabic (CCHI only), and Cantonese, Russian, Vietnamese, and Korean (NBCMI only). Outside those, both boards still offer a language-neutral path — CCHI's CoreCHI or CoreCHI-Performance, and NBCMI's Hub-CMI — which don't require a target-language exam to exist for your pair. Confirm with the hospitals or agencies you want to work for how they treat a language-neutral credential for your specific language.
Yes. Both CCHI and NBCMI list roughly 40 hours of formal healthcare or medical interpreter training among their eligibility requirements, on top of proven proficiency in English and your working language. Neither board treats general bilingualism or informal interpreting experience alone as sufficient — the training requirement exists specifically because interpreting accurately under pressure is a trained skill, not just a language skill.
Live captions and translation for the calls after the exam — state-of-the-art streaming accuracy, nothing stored. 30 free minutes every week, no credit card.
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