FDA Device Classes I, II, and III: What They Mean When You Buy Equipment
Every medical device sold in the U.S. carries an FDA classification — Class I, II, or III — and you’ll see these classes listed on IncMD product pages. Here’s what they mean and why they matter when you’re purchasing.
The three classes at a glance
- Class I — lowest risk. Exam tables, manual instruments, stands, many accessories. Most are exempt from premarket review; general controls apply.
- Class II — moderate risk. The bulk of clinical equipment: patient monitors, infusion pumps, ultrasound, electrosurgical units, most imaging. These typically reach market through 510(k) clearance — a premarket notification showing the device is substantially equivalent to an existing one. When you see a K-number on our listings, that’s the device’s 510(k).
- Class III — highest risk. Devices that sustain life or present the highest risk: implantable defibrillators, heart valves, and certain external defibrillation equipment. These generally require premarket approval (PMA), the FDA’s most rigorous pathway.
Class is about risk — Rx status is a separate question
A common misconception: class does not determine who can buy a device. Plenty of Class I items are Rx-only, and a handful of higher-class devices (like certain OTC-cleared AEDs) can be sold without a prescription. Purchase eligibility comes from the device’s labeling under 21 CFR 801.109, which is why our catalog marks Rx and OTC independently of class.
What it means for buying used
Classification follows the device forever — a used Class II monitor is still a Class II device, and reputable resellers maintain it to its original specifications. For certain tracked devices (defibrillators among them), federal rules also require distributors to record serial numbers and purchasers, which is why we capture that at checkout.
Where to look it up
Every device’s classification and clearance history is public in the FDA’s databases. On IncMD listings, you’ll find the class and 510(k) number (where applicable) right on the product page — see for yourself in the Provider Portal.