- What Qualifies You: The CAQ-OS Framework
- The Core Requirements at a Glance
- Certification and Licensure Rules
- The 4,000-Hour Specialty Experience Requirement
- Category I CME: 75 Credits in Six Years
- The Physician or Lead PA Attestation
- Fees and the Six-Year Window
- What You Qualify For: The Exam Itself
- Blueprint Topics Worth Studying Early
- Sequencing Your Qualification Steps
- After You Qualify: Validity and Maintenance
- Frequently Asked Questions
- The credential is the NCCPA Certificate of Added Qualifications in Orthopaedic Surgery (CAQ-OS), earned on top of your PA-C.
- You need 4,000 specialty hours in the preceding six years plus 75 Category I CME credits, 25 of them in the last two.
- A physician, lead PA, or program director must attest to your procedures and patient cases within 90 days of your score report.
- Total cost is $350 ($100 registration plus $250 exam), with six years allowed to finish initial requirements.
What Qualifies You: The CAQ-OS Framework
Before comparing requirements, it helps to be precise about what this credential is. The PA-COS designation discussed on this site refers to Certified Physician Assistant - Orthopaedic Surgery, and the official qualification behind it is the Certificate of Added Qualifications in Orthopaedic Surgery (CAQ-OS), issued by the National Commission on Certification of Physician Assistants (NCCPA). It is not a separate, stand-alone PA certification. It is a specialty add-on that sits on top of the PA-C credential you already hold.
That distinction shapes every requirement that follows. You do not qualify by completing a different training program or by attending a fellowship. You qualify by demonstrating, through documented hours, continuing education, and a third-party attestation, that your clinical practice has been genuinely orthopaedic. Then you pass a specialty examination. If you are still sorting out the terminology, our explainers on what PA-COS is and what PA-COS stands for cover the naming in more depth.
This article covers initial qualification only. Maintenance rules for a credential you already hold are different and are addressed briefly near the end so you are not surprised later.
The Core Requirements at a Glance
The table below summarizes every gate you must clear before and during the initial CAQ-OS process.
| Requirement | What NCCPA Expects |
|---|---|
| Base certification | Current PA-C |
| Licensure | Unrestricted PA license in a US jurisdiction or territory, or unrestricted government practice privileges; all held licenses must be unrestricted |
| Specialty experience | 4,000 hours in the preceding six years |
| Specialty CME | 75 Category I credits in six years, including 25 in the preceding two years |
| ACLS | Recommended, not mandatory |
| Attestation | Specialty physician, lead/senior PA, or physician/PA postgraduate program director; due within 90 days of the score report |
| Fees | $350 total: $100 program registration plus $250 examination |
| Time allowed | Six years to complete initial requirements |
Notice that nothing here is a degree or a residency. The structure rewards documented real-world orthopaedic work, which is why the hours and attestation pieces deserve the most planning.
Certification and Licensure Rules
Your PA-C must be current
The CAQ-OS builds on your PA-C, so a lapsed or inactive PA-C is a hard stop. If you are mid-way through a PANRE cycle or approaching a certification maintenance deadline, resolve that first. Starting the CAQ process on a shaky base credential invites avoidable delays.
Unrestricted licensure, with a catch
You need an unrestricted PA license in a US jurisdiction or territory, or unrestricted government practice privileges (for example, if you practice in a federal setting under those privileges). The detail that trips people up is that all licenses you hold must be unrestricted. If you maintain a second state license from a previous job and it carries a restriction, stipulation, or disciplinary condition, that can complicate eligibility even if your primary license is clean.
The 4,000-Hour Specialty Experience Requirement
NCCPA requires 4,000 hours of specialty experience within the preceding six years. For a full-time PA, that is roughly two years of orthopaedic work, which means most candidates exceed it comfortably. The requirement is more of a hurdle for PAs who:
- Recently transitioned into orthopaedics from primary care or another specialty
- Work part time or split their schedule across multiple service lines
- Rotate through general surgery or trauma services where only a portion of cases are orthopaedic
If your role is mixed, track how much of your time is genuinely orthopaedic. Clinic visits for fractures, joint pain, and sports injuries, first-assisting in orthopaedic cases, cast and splint application, injections, and perioperative management all fit the specialty profile. Maintain a running estimate with dates and practice settings so that your attester can speak credibly to the scope of your work.
Why the six-year lookback matters
The hours must fall in the six years preceding your application, not across your whole career. A PA who spent a decade in orthopaedics but moved to another field five years ago may have a thin window. Count backward from today and confirm you reach 4,000 inside that period.
Category I CME: 75 Credits in Six Years
You need 75 specialty Category I CME credits earned within six years, and at least 25 of those must come from the preceding two years. That second condition is a recency check: NCCPA wants evidence that you are actively current, not simply holding a stockpile of older credits.
The credits must be specialty-relevant, so orthopaedic content counts and unrelated topics do not. Good sources include:
- Orthopaedic society meetings and surgical skills courses
- Fracture management, arthroplasty, and sports medicine conferences
- Spine, hand, and pediatric orthopaedic courses
- Online orthopaedic CME with Category I designation
Key Takeaway
Choose CME that doubles as exam preparation. Courses on fracture classification, joint disorders, and soft-tissue injuries line up with the heaviest-weighted blueprint categories, so the same credits satisfy the requirement and strengthen your readiness.
ACLS is optional
Advanced Cardiac Life Support is recommended but not mandatory for the CAQ-OS. Keeping ACLS current is sensible for surgical practice and may be required by your employer, but you will not be turned away from the exam for lacking it.
The Physician or Lead PA Attestation
This is the requirement most candidates underestimate. NCCPA requires an attestation from someone who knows your work: a specialty physician, a lead or senior PA, or a physician or PA postgraduate program director familiar with you. They must confirm your experience with relevant orthopaedic procedures and patient cases, using the NCCPA Orthopaedic Surgery Procedures/Patient Case Attestation form.
The attestation is due within 90 days of your score report. That timing means you should not wait until after you pass to think about who will sign. A few practical points:
- Choose someone who has directly observed your work. An orthopaedic surgeon you assist regularly is ideal; a distant administrator is not.
- Give them lead time. Busy surgeons are not always quick with paperwork, and ninety days passes faster than expected.
- Review the form's procedure and case categories yourself first. If your experience is thin in an area, know that before you ask someone to attest.
Fees and the Six-Year Window
The initial CAQ-OS costs $350 in total, split into a $100 program registration fee and a $250 examination fee. You have six years to complete the initial requirements, and if you need another examination attempt within that period, it costs $250 rather than the full amount again.
| Cost Item | Amount |
|---|---|
| Program registration | $100 |
| Examination | $250 |
| Total initial cost | $350 |
| Additional exam attempt (within six years) | $250 |
| Optional NCCPA practice exam (60 questions, 60 minutes, 180-day access) | $50 |
For a broader view that includes prep materials and CME spending, see our PA-COS certification cost breakdown. If you are weighing whether the investment pays off, the ROI analysis and salary guide discuss the career side of the decision.
What You Qualify For: The Exam Itself
Meeting the requirements gets you to the test. Understanding its format shapes how you prepare. The CAQ-OS examination is delivered at Pearson VUE test centers and consists of 120 multiple-choice questions, split into two 60-question blocks of 60 minutes each. That is two hours of testing time, with a separate 15-minute tutorial and a 15-minute break. Review is limited to the active block, so once you move on from the first block you cannot return to change answers.
That block structure has a practical consequence: you need to manage pacing within each 60-minute segment rather than banking time across the whole exam. For scheduling and testing-window details, see our guide to PA-COS exam dates, and for how scoring works, read about the PA-COS passing score.
If you are wondering about difficulty, our difficulty guide and pass rate article put the exam in context.
Blueprint Topics Worth Studying Early
NCCPA publishes a Content Blueprint for the Orthopaedic Surgery CAQ Examination, an undated document that the issuer states is based on the 2023 PA Practice Analysis. It divides the exam into nine weighted categories. Knowing the weights tells you where eligibility-stage CME and early study will pay off most.
| Domain | Weight |
|---|---|
| Fractures/Dislocations | 25% |
| Soft-Tissue Injuries and Disorders | 25% |
| Joint Disorders | 20% |
| Preoperative, Postoperative, and Complication Management | 7% |
| Spine | 7% |
| Benign and Malignant Bone Tumors | 5% |
| Infectious Diseases and Connective Tissue Disorders | 5% |
| Pediatric | 4% |
| Professional, Legal, and Ethical Issues | 2% |
Fractures/Dislocations (25%)
The largest category, and one where daily orthopaedic practice gives you a head start.
- Fracture patterns, classification, and recognition on imaging
- Reduction, immobilization, and when surgical fixation is indicated
- Joint dislocations and the neurovascular checks that follow reduction
Soft-Tissue Injuries and Disorders (25%)
Equal in weight to fractures, and often undersold by candidates who focus on bones.
- Tendon, ligament, and muscle injuries and their examination findings
- Overuse and compressive conditions across the upper and lower extremity
- Appropriate imaging and conservative versus operative management
Joint Disorders (20%)
The third pillar, spanning degenerative and inflammatory joint disease.
- Osteoarthritis evaluation and stepwise treatment
- Indications for injection and arthroplasty
- Recognizing when a painful joint signals something systemic or infectious
The same blueprint also classifies questions by overlapping task categories, which are not additional domains. They include History Taking and Performing Physical Examination (20%), Ordering and Interpreting Diagnostic and Laboratory Studies (20%), Formulating Most Likely Diagnosis (25%), Treatment/Intervention (25%), Patient Education and Preventive Measures (5%), Applying Scientific Concepts (3%), and Professional, Legal, and Ethical Issues (2%). In other words, a single fracture question might simultaneously test diagnosis and treatment. For a complete walkthrough of each category, see our PA-COS exam domains guide.
Sequencing Your Qualification Steps
Because several requirements run on different clocks, order matters. Here is a practical sequence tied to the specific demands of the CAQ-OS rather than a generic study schedule.
Verify eligibility
- Confirm PA-C is current and every license is unrestricted
- Estimate specialty hours against the 4,000-hour, six-year standard
- Total your Category I CME and check the 25-credit recent-two-year condition
Close any gaps
- Schedule orthopaedic CME that targets fractures, soft tissue, and joints
- Identify your attester and share the procedures/patient case form
Register and prepare
- Pay the $100 registration and schedule at a Pearson VUE center
- Study the 25/25/20 domains first, then the smaller categories
- Consider the $50 NCCPA practice exam for format familiarity
Test and finalize
- Sit for the 120-question exam
- Return the signed attestation within 90 days of the score report
On preparation, remember that the NCCPA practice exam does not provide item-by-item explanations and does not predict whether you will pass. The free sample-question critiques, by contrast, do explain their answers. Pair them with a structured plan from our PA-COS study guide, and use the main practice test site for additional timed question practice.
After You Qualify: Validity and Maintenance
An earned CAQ-OS is valid for ten years. To keep it, you must maintain your PA-C and unrestricted licensure, earn 125 specialty Category I CME credits during the cycle, and pass a maintenance examination. The maintenance-only online option is open-reference, with 120 questions, five minutes per question, and an approximately six-week completion window. These maintenance rules are separate from the initial examination, which is a proctored test-center exam with the limits described above, so do not confuse the two.
Holding the certificate can also strengthen your position with employers. Orthopaedic surgery groups, hospital orthopaedic service lines, sports medicine practices, and trauma programs all rely on PAs, and a specialty credential signals validated depth. For a look at the employment landscape, see our overview of PA-COS jobs.
Frequently Asked Questions
Yes. The CAQ-OS is an added qualification layered on a current PA-C, and you must also hold unrestricted PA licensure in a US jurisdiction or territory, or unrestricted government practice privileges. All licenses you hold must be unrestricted.
You need 4,000 hours of specialty experience in the preceding six years and 75 specialty Category I CME credits earned within six years, with at least 25 of those credits from the preceding two years.
A specialty physician, lead or senior PA, or a physician or PA postgraduate program director familiar with your work can attest to your orthopaedic procedures and patient cases. It is due within 90 days of your score report.
The total is $350: $100 for program registration and $250 for the examination. You have six years to complete the initial requirements, and a retake within that period costs $250.
No. ACLS is recommended but not mandatory. Your employer may still require it, so keeping it current is wise for surgical practice.
For a consolidated view of the credential itself, visit our overview of PA-COS certification, and when you are ready to start drilling questions, head to the PA-COS Exam Prep practice tests.