COF Cheat Sheet 2026

The 30 highest-yield COF facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. A certified orthotic fitter learns that a patient's insurance will not cover the most clinically appropriate device. The fitter should: → Inform the patient of all options including the non-covered device and associated costs
2. When billing Medicare for a custom-fabricated orthosis, which modifier is typically required to indicate the item was custom-made? → Modifier -KX
3. When performing a skin check after initial AFO fitting, redness that blanches with pressure and resolves within 20 minutes is classified as: → Normal reactive hyperemia from initial loading
4. Which of the following orthotic interventions is contraindicated in a patient with peripheral arterial disease (PAD) and reduced sensation? → Rigid corrective posting with high trim lines that contact bony prominences
5. Which measurement is taken to determine the correct length of a Lofstrand (forearm) crutch for a patient? → From the floor to 2 inches below the elbow flexed at 15-20 degrees
6. A pharmaceutical company offers to sponsor an orthotic fitter's continuing education in exchange for product endorsements. The fitter should: → Disclose the sponsorship arrangement and evaluate for conflicts of interest
7. Which of the following is the most appropriate way to assess a patient's health literacy before orthotic education? → Use the 'teach-back' method to have the patient repeat or demonstrate key instructions
8. The three-point pressure system is the biomechanical basis for most orthoses. In a PIP extension orthosis, where are the three forces applied? → Dorsal proximal phalanx, palmar PIP joint, dorsal middle phalanx
9. In a patient with L3–L4 spinal cord injury, which orthotic option best facilitates community ambulation? → Bilateral KAFOs
10. Under Medicare, which HCPCS code range primarily covers orthotic devices? → L-codes (L0000–L4999)
11. Which characteristic of carbon fiber composite makes it particularly valuable in energy-storing orthotic devices? → High stiffness-to-weight ratio with elastic energy storage
12. When fitting a prefabricated wrist-hand orthosis, which wrist position is considered the 'functional position' for most resting splints? → Wrist extended 20-30 degrees with fingers in slight flexion
13. In Patient Assessment & Measurement, what is the FIRST step a COF professional should take when encountering a new case or situation? → Conduct a comprehensive assessment and gather all relevant information
14. The Craig-Scott KAFO, designed for patients with thoracic or lumbar level spinal cord injury, incorporates all of the following features EXCEPT: → Bichannel adjustable ankle locks (BICALs)
15. A certified orthotic fitter receives a subpoena requesting patient records for a legal proceeding. The appropriate response is to: → Consult legal counsel and follow applicable HIPAA and state law procedures
16. What material property is MOST critical when selecting thermoplastic materials for pediatric orthoses compared to adult orthoses? → Low-temperature formability to facilitate frequent remolding as the child grows
17. When educating a patient about wearing a rigid TLSO, the orthotist should instruct the patient to wear a thin cotton T-shirt beneath the orthosis primarily to: → Protect skin from pressure and friction while absorbing perspiration
18. Why is polyethylene foam (Plastazote) commonly used as an interface liner in diabetic foot orthotics? → It molds to foot contours with body heat and offloads pressure
19. A patient with radial nerve palsy presents with wrist drop. Which orthosis is MOST appropriate to restore functional hand use? → Dynamic wrist extension orthosis
20. How can a COF demonstrate professionalism? → Respecting and listening to patient needs
21. A patient with a spastic equinovarus foot in cerebral palsy would most likely exhibit which gait deviation during swing phase? → All of the above are common compensations
22. In orthotic patient education, which communication style is most effective for patients from low-health-literacy backgrounds? → Using plain language, visual aids, and hands-on demonstrations
23. A patient's skin assessment reveals stage 2 pressure injury under a previously worn orthosis. The FIRST step in the fitting process should be: → Document and refer to wound care before refitting
24. Which trimline position on a posterior leaf spring (PLS) AFO increases mediolateral ankle stability? → Trimline moved anterior to the malleoli
25. Which anatomical landmark is used as the proximal reference point when measuring for a knee-ankle-foot orthosis (KAFO)? → Ischial tuberosity
26. For a child fitted with a Resting Hand Splint following spastic hemiplegia, what wrist and finger position should be maintained? → Wrist 20–30° extension, fingers and thumb in functional alignment
27. Which ligament of the ankle is most commonly injured in an inversion sprain? → Anterior talofibular ligament
28. In Lower Extremity Orthotics, what is the FIRST step a COF professional should take when encountering a new case or situation? → Conduct a comprehensive assessment and gather all relevant information
29. What is the primary role of ligaments? → Connect bones to bones
30. Which ICD-10-CM code category is most commonly used to support medical necessity for a lumbar orthosis prescribed for degenerative disc disease? → M50–M54 (Other dorsopathies, including disc disorders)