FDA Medical Device Classification: Class I, II, and III Explained

2026-07-31 · Caduvo Team

Confused by FDA medical device classes? Learn how risk-based classification works, get concrete device examples, and see how to look up your product code and premarket requirements.

If you’re building a medical device and you haven’t yet figured out your FDA classification, stop everything. Classification determines your regulatory pathway, the type of submission you’ll need (if any), and the timeline and cost to market. Get it wrong and you could burn 18 months chasing a 510(k) when your device was actually Class I exempt. Get it right and you can target a clearance path that fits your budget.

The Three FDA Medical Device Classes

The FDA groups devices into three classes based on the level of control needed to assure safety and effectiveness. The higher the risk, the more regulatory controls apply.

• Class I – Low risk. General controls are sufficient. These devices are often simple, non-invasive, and not intended to support or sustain life. Examples: manual toothbrushes, exam gloves, elastic bandages, tongue depressors. Most Class I devices are exempt from premarket notification (no 510(k) required), but you must still register your establishment, list the device, and comply with the Quality System Regulation (21 CFR Part 820) unless the regulation explicitly exempts you from parts of it.
• Class II – Moderate risk. General controls alone aren’t enough; the FDA adds special controls like performance standards, postmarket surveillance, special labeling, or guidance documents. Examples: powered wheelchairs, infusion pumps, surgical drapes, contact lens care products. Unless exempt, Class II devices need a 510(k) submission that demonstrates substantial equivalence to a predicate device.
• Class III – High risk. These devices sustain or support life, are implanted, or present a potential unreasonable risk of illness or injury. General and special controls can’t provide reasonable assurance of safety and effectiveness, so they usually require premarket approval (PMA) with clinical data. Examples: implantable pacemakers, heart valves, breast implants, deep brain stimulators. Some novel, lower‑risk devices that would default to Class III can be reclassified to Class I or II through the De Novo pathway.

How FDA Determines Your Device’s Class

Classification isn’t guesswork. The FDA defines a device’s class in a classification regulation based on its intended use and the risk it poses. These regulations are organized into 19 medical specialty panels (cardiovascular, orthopedic, dental, etc.) and published in Title 21 of the Code of Federal Regulations (CFR). Each regulation describes a generic type of device, assigns a class, and links to a three‑letter product code.

For example, 21 CFR 872.6855 covers manual toothbrushes. That single regulation tells you the device is Class I, exempt from 510(k), and falls under the dental panel. The associated product code (GRA) is what you use for adverse event reporting, device listing, and searching the FDA’s databases.

The product code is your shortcut. Once you have it, you can immediately see the device class, whether a 510(k) is required, and what panel reviews your device.

How to Find Your Device Classification and Product Code

1. Go to the FDA’s Product Classification database.
2. Type a device name or part of the intended use. Try “manual toothbrush,” “powered wheelchair,” or “infusion pump.”
3. The results show the three‑letter product code, the regulation number, the class, and whether the device requires a 510(k). For a manual toothbrush you’ll see product code GRA, regulation 21 CFR 872.6855, Class 1, and “Exempt.”
4. Click the regulation number to read the formal device description and see which general and special controls apply.

If a search by name doesn’t work, search by review panel or by a function word. Many devices fall into clear product codes; some might fit multiple codes. When that happens, choose the code that most closely matches your primary intended use. If you need certainty, you can submit a 513(g) request for classification, but it takes months and costs a user fee. Many startups first look at competitor clearances and predicate device selections to narrow the field.

What Your Classification Means for Premarket Requirements

Once you have your class and product code, the regulatory pathway locks into place.

• Class I – Nearly all are 510(k) exempt. You still must register your facility, list the device, and follow general controls (including the QSR unless a specific exemption exists). Labeling, misbranding, and adulteration rules still apply.
• Class II – Unless exempt, you’ll need 510(k) clearance. In addition to general controls, the regulation may list special controls like adherence to a specific IEC standard, biocompatibility testing, or postmarket surveillance. The 510(k) must show your device is substantially equivalent to a legally marketed predicate.
• Class III – Most require a PMA, a data‑intensive application with clinical evidence. If your device is novel and low‑to‑moderate risk but falls into Class III by default, the De Novo pathway can reclassify it to Class I or II. A Breakthrough Device Designation can speed FDA review and makes the device eligible for Medicare transitional coverage, though it does not change the submission type itself.

Caduvo can pull up your device’s classification, product code, and regulatory pathway in seconds—without manual database hunts.

Actionable Takeaways

• Start with the FDA Product Classification database. Search by your device’s intended use and pull the three‑letter product code.
• Read the corresponding regulation number (21 CFR xxx.xxxx). It tells you the class, exemption status, and which controls apply.
• If your device is Class II and not exempt, begin mapping your predicate device strategy early.
• Don’t confuse classification with reimbursement. A Class I device still needs coding and coverage planning to get paid.
• Misclassification can delay your timeline by months or force you to redo your submission. When in doubt, validate with regulatory experts.