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

2026-09-29 · Caduvo Team

Learn how FDA medical device classes determine your regulatory pathway, how to find your device classification and three-letter product code, and what Class I, II, and III mean for premarket requirements.

Your FDA pathway starts with one question: which risk class does the device fall into? The answer determines whether you file a 510(k), submit a De Novo, or need a PMA. Founders often guess by comparing their product to a familiar device, then discover late that the product code and regulation tell a different story.

The three FDA medical device classes

FDA groups devices into three risk classes. Class I is lowest risk, Class III is highest risk.

Class I: Low risk, often simple instruments or non-invasive products. Examples include tongue depressors, exam gloves, elastic bandages, and manual stethoscopes. Most Class I devices are exempt from 510(k) and PMA requirements, but they still must follow general controls.

Class II: Moderate risk. Examples include powered wheelchairs, infusion pumps, surgical drapes, and pregnancy test kits. Class II devices usually require a 510(k) unless specifically exempted, and they must meet general controls plus special controls such as performance standards or postmarket surveillance.

Class III: Highest risk. These devices sustain life, prevent serious health impairment, or present an unreasonable risk of illness or injury. Examples include implantable pacemakers, heart valves, and neurostimulators. Class III devices generally require a PMA with clinical data, unless a De Novo reclassifies them to Class I or II.

How classification maps to FDA pathway and controls

General controls apply to all classes: establishment registration, device listing, labeling, quality system requirements, and medical device reporting. Class II adds special controls, which may be a guidance document, a mandatory performance standard, or a specific labeling requirement. Class III adds premarket approval, which typically means bench testing, animal studies, and human clinical trials.

The practical mapping is simple:

De Novo is not a shortcut for high-risk devices. It is the path for a device with no predicate that is automatically Class III by statute but should be Class I or II based on risk. See 510(k) vs PMA vs De Novo: Choosing Your FDA Pathway.

How to find your device classification and product code

Do not guess from a competitor's product name. Use the FDA Product Classification Database.

  1. Go to the FDA Product Classification Database at accessdata.fda.gov/scripts/cdrh/cfdocs/cfpcd/classification.cfm.
  2. Search by device name, such as “blood pressure cuff,” or by a partial regulation number, such as “870.1100.”
  3. Open the regulation number that matches your intended use and indications.
  4. Confirm the device description fits your product. The regulation definition is specific; if your device does more, it may belong in a different regulation.
  5. Note the regulation number, device class, three-letter product code, and whether a 510(k) or PMA is required.
  6. If no existing classification fits, search the De Novo classification list for similar devices that FDA has reclassified.

Each classification entry includes a three-letter product code. For example, product code FLL covers blood pressure cuffs under 21 CFR 870.1100 and sits in Class II. Product code DXN covers tongue depressors under 21 CFR 880.6230 and is Class I exempt. The product code, not the device name, drives FDA expectations.

What each class means for premarket requirements

Class I exempt: No premarket submission. You register your establishment and list the device before marketing. You still need a quality system, labeling controls, and adverse event reporting. Time to market can be weeks.

Class II non-exempt: You must file a 510(k). The FDA review target is 90 days after acceptance, but total time from first submission to clearance is often 6 to 12 months once you add Q-sub meetings, response rounds, and additional testing. See What Is a 510(k)? FDA Clearance for Medical Devices Explained.

Class III: You must file a PMA. Most PMAs require a clinical study, a manufacturing inspection, and a panel review. The statutory review target is 180 days, but total time from study start to approval is often 2 to 5 years. Some Class III devices can use the De Novo pathway instead, but only if FDA agrees the risk is low or moderate.

How-to: look up your classification in 10 minutes

  1. Open the FDA Product Classification Database.
  2. Type the generic name your device would use in a catalog, not your brand name.
  3. Scan the results for the regulation that matches your intended use.
  4. Read the device definition in the regulation. If it does not match, widen or narrow your search terms.
  5. Write down the product code, class, and submission requirement.
  6. If the product code says “510(k) exempt” and you are Class II, verify the exemption still applies to your specific indications.
  7. For a Class II non-exempt device, start your predicate search. See How to Find and Choose a Predicate Device for a 510(k) That Won’t Get Held Up.

Actionable takeaways

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