OASIS Certification
Get COS-C Certified
Prove your OASIS expertise with the credential trusted across home health. Lead your clinical team with confidence and accuracy.
Open book · 100 questions · 2.5 hours
Computer-Based Exam
$395 initial · $345 renewal
At a PSI testing center, on a date you choose.
Paper & Pencil Exam
$300 initial · $250 renewal
In person, after a live workshop.
Trusted by clinicians at leading health systems
Why get COS-C certified
Turn your OASIS expertise into a recognized credential
Prove it
Show your OASIS knowledge goes beyond familiarity. The COS-C validates the accuracy, judgment and confidence you bring to every assessment.
Protect it
Support cleaner data, stronger compliance, appropriate reimbursement and deserved quality outcomes with decisions grounded in CMS guidance.
Stand out
COS-C signals commitment and credibility. It sets apart clinicians, educators, QA reviewers and leaders who take accuracy seriously.
Step by step
How to get OASIS certified
1
Choose your format
Computer-based at a PSI center on your schedule, or paper and pencil after a live workshop. It’s the same exam either way.
2
Prepare
The exam is open book. Bring a paper reference you know well, and learn where the answers live before test day. See the prep options below.
3
Register
Register with OASIS Answers. For computer-based testing, you then schedule your seat with PSI. Take the exam within 12 months of purchase.
4
Pass and earn your COS-C
Answer 100 multiple-choice questions in 2.5 hours. Pass, and you hold the Certificate for OASIS Specialist-Clinical.
What to expect
What’s on the COS-C Exam
The exam covers CMS guidance on:
- OASIS regulations
- Data collection time points
- Patient populations
- Data collection conventions
- OASIS item-by-item guidance
Open book
Bring a paper OASIS reference
100
Multiple-choice questions
2.5 hrs
Timed exam
CMS
Based only on CMS guidance
Test with confidence
Walk in ready to pass the first time
Pick the prep that fits your time. Each one is built by the team that teaches CMS OASIS guidance nationwide.
Not sure which one you need? Take the free OASIS Knowledge Check to see where you stand and get a prep recommendation.
Your test-day reference
INSTANT OASIS Answers
CMS guidance organized by OASIS item, color coded so you find answers fast during the exam and on the job.
From $75
A full refresher
Blueprint for OASIS Accuracy
The flagship 2-day, in-person workshop and COS-C prep. Includes a 650+ page handout you can use during the exam.
From $695
A timed practice test
COS-C Exam Cram
An on-demand, timed practice exam. Expert presenters walk through each question and the CMS guidance behind it.
From $299
Real clinicians, real results
Why home health clinicians get COS-C certified
★★★★★
“It proves I’m an expert in my field and committed to excellence. I can be a confident leader to my home care clinicians.”
Katie S. · COS-C
★★★★★
“This certification opened doors I never thought imaginable. I’ve passed the COS-C exam four times.”
Jessica C. · COS-C
★★★★★
“I worked hard to earn it and recertify. It makes me better at my job and grows my OASIS knowledge every time.”
Nikki H. · COS-C
Since 2004
Certifying OASIS specialists
30,000+
COS-C exam administrations
98%
Of certified clinicians recommend us
What is the OASIS test?
Most people mean the COS-C Exam, the certification exam for OASIS data collection. It is a 100-question, open-book exam based only on CMS OASIS guidance.
Who can take the COS-C Exam?
The exam is open to all participants. There are no prerequisites other than a desire to demonstrate your knowledge of CMS data collection guidance and commitment to OASIS data accuracy. Suggested professions: Home Health Nurses, Therapists, or other home healthcare professionals responsible for conducting comprehensive assessments, coding OASIS items, auditing clinical records, or educating and orienting staff.
How long does the COS-C Exam take?
2.5 hours, 100 multiple-choice questions. Exam results are reported as Pass or Fail. At exam check-in, candidates must present two forms of identification, one of which must be a valid government-issued ID.
What's on the COS-C Exam?
The COS-C Exam covers CMS rules and instructions on the OASIS time points, regulations, patient populations and OASIS item-specific coding. The exam is open-book; candidates are allowed to bring ANY paper-based OASIS reference materials into the examination. These materials can include, but are not limited to: CMS Core OASIS Documents, OASIS Guidance Manual, CMS OASIS Q&As, the Blueprint for OASIS Accuracy handout, and an INSTANT OASIS Answers book.
How should I prepare for the COS-C Exam?
Learn the CMS guidance and practice with a paper reference you can bring into the exam. INSTANT OASIS Answers, the Blueprint for OASIS Accuracy workshop, and COS-C Exam Cram each fit a different amount of study time. See the prep options above.
Can I reschedule my exam?
Computer-based exam: reschedule at no charge directly with PSI 48 or more hours before your exam. Inside 48 hours, email support@oasisanswers.com to reschedule for a $95 administrative fee. Paper and pencil exam: see the refund and transfer policy.
Get started
Ready to get COS-C certified?
Pick the format that fits your schedule. It’s the same open-book exam and the same credential either way.
- Open book
- 100 questions in 2.5 hours
- Based only on CMS guidance
Computer-Based Exam
$395 initial · $345 renewal
Schedule at a PSI testing center near you, on a date you choose.
Paper & Pencil Exam
$300 initial · $250 renewal
Take it in person, in a proctored classroom after a live workshop.