Interpreter Certification Guide: CMI vs CHI vs CCHI — Which One Do You Need?

You’ve been interpreting for a while. Maybe you started uncertified, took calls through an agency, and now you’re wondering whether certification is worth the money and the study time. Or you’re just starting out and every guide tells you to “get certified” without explaining which credential, why, or whether it actually moves the needle on your income.

The short answer: certification matters, but which one you get depends on your language, your specialty, and what agencies in your market actually care about. This guide breaks down the three credentials you’ll hear about most — CMI, CHI, and CoreCHI — compares them side by side, and gives you a straight answer on which one is worth your time in 2026.

The Two Certifying Bodies

There are two national organizations that certify healthcare interpreters in the United States. That’s it. Two. Everything else — state court certifications, ATA credentials, agency-specific badges — is a different conversation.

CCHI (Certification Commission for Healthcare Interpreters)

CCHI offers three credentials:

• CoreCHI — A knowledge-based written exam. Available to interpreters of any language pair. Tests your understanding of medical terminology, ethics, standards of practice, and the role of the interpreter. No oral component.
• CoreCHI-P — The performance-based version of CoreCHI. Same scope but includes an oral performance assessment. This is the replacement for CoreCHI starting in 2027.
• CHI — The full Certified Healthcare Interpreter credential. Includes both written and oral components. Currently available in Spanish, Mandarin, and Arabic only.

CCHI’s credentials are the only interpreter certifications in the U.S. accredited by the NCCA (National Commission for Certifying Agencies). That’s the same accreditation body that validates certifications for nurses, paramedics, and other healthcare professionals. It’s not a small distinction — NCCA accreditation means the exam itself has been independently evaluated for psychometric validity and fairness.

NBCMI (National Board of Certification for Medical Interpreters)

NBCMI offers one credential:

• CMI (Certified Medical Interpreter) — A two-part exam: written knowledge test plus an oral performance exam. Available in Spanish, Russian, Mandarin, Cantonese, Korean, Vietnamese, Arabic, and Portuguese.

The CMI has strong name recognition among hospital systems, particularly on the East Coast and in markets where NBCMI was the first certifying body to establish itself. It is not NCCA-accredited.

The Comparison Table

Here’s what you actually need to see side by side:

	CoreCHI (CCHI)	CoreCHI-P (CCHI)	CHI (CCHI)	CMI (NBCMI)
Exam format	Written only	Written + oral performance	Written + oral	Written + oral
Languages	Any language pair	Any language pair	Spanish, Mandarin, Arabic	8 languages
NCCA accredited	Yes	Yes	Yes (Spanish)	No
Eligibility	40+ hrs training, bilingual proficiency	40+ hrs training, bilingual proficiency	40+ hrs training, bilingual proficiency	40+ hrs training, bilingual proficiency
Cost (2026)	$150 (special pricing)	$150 (special pricing)	$150 (special pricing)	~$575 (written + oral)
Renewal cycle	4 years	4 years	4 years	5 years
CEUs for renewal	32 hours (4 performance-based)	32 hours (4 performance-based)	32 hours (4 performance-based)	30 hours

CoreCHI Is Being Sunset

This is the biggest change happening right now, and most guides haven’t caught up.

CoreCHI — the knowledge-only written exam — is being retired on December 31, 2026. After that date, CCHI will only offer CoreCHI-P, which adds an oral performance component. If you’ve been planning to take the CoreCHI because it’s “easier” (no oral exam), your window is closing.

The reasoning makes sense. A written-only exam can test whether you know the code of ethics and can define medical terms. It can’t test whether you can actually interpret under pressure. CoreCHI-P fixes that gap.

If you’re on the fence, here’s the calculation: take CoreCHI now at $150 before the deadline, or wait and take CoreCHI-P in 2027 when the format and pricing may change. Either way, you’ll have an NCCA-accredited credential.

Which One Should You Get?

This is where every guide gets vague. Let’s not.

If you interpret Spanish, Mandarin, or Arabic: Get the CHI from CCHI. It’s NCCA-accredited, it’s cheaper than the CMI, and the full credential (written + oral) carries real weight. At $150 in 2026, the cost barrier is almost gone.

If you interpret one of NBCMI’s eight languages (and it’s not Spanish/Mandarin/Arabic): The CMI is your strongest option for a credential with an oral component. Russian, Korean, Vietnamese, Cantonese, and Portuguese interpreters don’t have access to CCHI’s CHI oral exam. The CMI fills that gap.

If your language isn’t covered by either oral exam: CoreCHI-P from CCHI is your path. It’s the only NCCA-accredited credential available to interpreters of any language pair, and it now includes a performance component. Somali, Haitian Creole, Hmong, Burmese, Tigrinya — this is your certification.

If agencies in your market specifically request one: Get that one. Credential debates don’t matter if the agency writing your checks requires the CMI and you showed up with a CoreCHI. Ask before you register.

Not sure which credential matches your language and goals? The certification path finder walks you through the decision based on your language pair and specialty.

Some interpreters hold both. If you work with multiple agencies or across markets, having CMI and CHI isn’t redundant — it’s insurance against different hiring requirements.

What Certification Actually Does to Your Pay

Let’s talk money, because that’s really what this decision comes down to for most people.

Certified interpreters earn an average of $33.85 per hour compared to $25 per hour for non-certified interpreters. That’s a 35% premium. Over a year of full-time work, that gap is roughly $18,000.

Now, correlation isn’t causation. Certified interpreters tend to be more experienced, work higher-paying specialties, and negotiate better. But certification is the credential that gets you into the room — or onto the platform — where those higher rates exist.

Some agencies won’t even consider you without certification. Others list it as “preferred” but functionally treat it as required. A few don’t care at all. The trend line is clear: more agencies are requiring it, not fewer. If you’re building a career and not just picking up shifts, certification is table stakes. The gap widens further once you specialize in a high-demand area like legal or medical.

For a deeper look at pay ranges, specialties, and how modality affects your rate, see our medical interpreter salary breakdown.

What About Court and Legal Certification?

Healthcare certification and court certification are completely separate systems. Don’t confuse them.

Federal court certification is administered by the Administrative Office of the U.S. Courts and is currently available only in Spanish. It’s a rigorous exam with a notoriously low pass rate — historically under 10%. If you pass, you’re on the federal registry and eligible for federal court assignments at premium rates.

State court certification varies by state. Some states have their own exams, others use consortium exams through organizations like the NCSC (National Center for State Courts). Language availability varies widely. Some states certify 10+ languages; others only certify Spanish.

Neither CCHI nor NBCMI credentials qualify you for court work. They’re healthcare-specific. If you want to do legal interpreting, you need the relevant court certification on top of — or instead of — your medical credentials. We cover that path in detail in our court interpreter certification guide.

What About ATA Certification?

The ATA (American Translators Association) certifies translators, not interpreters. Translation is written; interpreting is spoken. If someone asks whether you’re “ATA certified” for interpreting, they’re mixing up the credentials. It happens constantly.

ATA certification is valuable if you also do written translation work. It’s irrelevant to your OPI or in-person interpreting credentials.

Certification Maintenance: The Part Nobody Mentions Up Front

Getting certified isn’t a one-time event. Both CCHI and NBCMI require continuing education units (CEUs) to maintain your credential.

CCHI: 32 CEU hours every 4 years, with at least 4 of those being performance-based (mock interpreting, mentored sessions, etc.). That averages to 8 hours per year.

NBCMI: 30 CEU hours every 5 years. That’s 6 hours per year on average.

CEU sources include conferences, webinars, online courses, mentorship programs, and professional association events. NAJIT, ATA, and both certifying bodies offer approved CEU programs. Many are free or low-cost. Some agencies also provide CEU-eligible training.

Budget for this. Not just the money (most CEUs run $0–$50 per session) but the time. If your credential lapses, you may need to retake the exam.

The Practical Path: What to Do This Week

If you’re still reading, you’re serious. Here’s the action plan.

Step 1: Confirm you have 40+ hours of healthcare interpreter training. If not, complete a program like Bridging the Gap or Cross-Cultural Communications. Both are recognized by CCHI and NBCMI. (Our full training guide: How to Become a Medical Interpreter.)

Step 2: Decide which credential fits your language and market. Use the table above. When in doubt, ask the agencies you work with — or want to work with — which certification they require.

Step 3: Register and schedule your exam. For CCHI, go to cchicertification.org and lock in the 2026 pricing before CoreCHI sunsets. For NBCMI, go to certifiedmedicalinterpreters.org.

Step 4: Study. The exams test medical terminology, ethics, standards of practice, cultural competency, and interpreting protocols. CCHI and NBCMI both publish candidate handbooks with content outlines. Use them.

Step 5: Once certified, put it on everything. Your resume, your agency profiles, your LinkedIn. Agencies filter by certification status. If it’s not listed, it doesn’t exist to their recruitment software.

The Bottom Line

Certification is the line between “I speak two languages” and “I’m a credentialed professional.” It costs money and study time. It pays back in higher rates, better assignments, and access to agencies that won’t look at you without it.

In 2026, the landscape is shifting. CoreCHI is sunsetting. CCHI’s special pricing makes the barrier lower than it’s been in years. Agencies are tightening requirements. If you’ve been putting it off, the math favors doing it now.

Pick the credential that matches your language and your market. Register. Study. Pass. Then get back on the phone and earn what you’re worth.

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Related reading:

• How to Become a Medical Interpreter: The Honest Guide
• Court Interpreter Certification: What You Need to Know
• Medical Interpreter Salary: What You’ll Actually Earn