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EU MDR Annex VIII Classification Rules Reference (Rules 1 to 22)

Under Regulation (EU) 2017/745 the device class decides the conformity assessment route, notified body involvement and the depth of clinical evidence. This reference condenses the 22 Annex VIII rules into a table you can search by topic.

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Rule	Topic	Group	Class outcome (summary)
Rule 1	Non-invasive devices that touch only intact skin or do not touch the patient	Non-invasive	Class I
Rule 2	Non-invasive devices intended for channelling or storing body liquids, tissues, gases for later administration	Non-invasive	Class IIa, with IIb where connected to higher class active devices or used for certain blood storage
Rule 3	Non-invasive devices that modify the biological or chemical composition of blood, body liquids or other liquids for infusion	Non-invasive	Class IIb, with IIa in limited filtration cases
Rule 4	Non-invasive devices that contact injured skin or mucous membrane	Non-invasive	Class I, IIa or IIb depending on the wound type and purpose
Rule 5	Invasive devices in body orifices, not surgically invasive	Invasive	Class I, IIa or IIb depending on duration and location
Rule 6	Surgically invasive devices for transient use	Invasive	Class IIa by default, with IIb or III for specific uses such as heart or central circulation contact
Rule 7	Surgically invasive devices for short-term use	Invasive	Class IIa by default, with IIb or III for specific uses
Rule 8	Implantable devices and long-term surgically invasive devices	Invasive	Class IIb by default, with IIa and III for specified cases
Rule 9	Active therapeutic devices intended to administer or exchange energy	Active	Class IIa by default, with IIb where the energy delivery is potentially hazardous
Rule 10	Active devices intended for diagnosis and monitoring	Active	Class IIa by default, with IIb for vital physiological parameter monitoring in some cases
Rule 11	Software intended to provide information used for diagnostic or therapeutic decisions, or to monitor physiological processes	Software	Class IIa by default, with IIb or III depending on potential harm; other software Class I
Rule 12	Active devices intended to administer or remove medicinal products, body liquids or other substances	Active	Class IIa, with IIb where the manner is potentially hazardous
Rule 13	All other active devices	Active	Class I
Rule 14	Devices incorporating a medicinal substance as an integral part	Special	Class III
Rule 15	Devices used for contraception or prevention of sexually transmitted diseases	Special	Class IIb, with III for implantable or long-term invasive ones
Rule 16	Devices intended for disinfecting, cleaning, rinsing or hydrating contact lenses	Special	Class IIb
Rule 17	Devices specifically intended for disinfecting or sterilizing medical devices	Special	Class IIa, with IIb for those used on invasive devices as the end point of processing
Rule 18	Devices manufactured using non-viable animal or human tissues or cells	Special	Class III, with exceptions for devices contacting only intact skin
Rule 19	Devices incorporating or consisting of nanomaterial	Special	Class III, IIb or IIa depending on the potential for internal exposure
Rule 20	Invasive devices in body orifices intended to administer medicinal products by inhalation	Special	Class IIa, with IIb where efficacy or safety is critical
Rule 21	Devices composed of substances introduced into the body or absorbed by it	Special	Class III, IIb or IIa depending on route and action
Rule 22	Active therapeutic devices with an integrated or incorporated diagnostic function that significantly determines patient management (closed loop)	Special	Class III

This is a simplified summary for orientation. The rule text in Annex VIII and the MDCG classification guidance contain conditions and exceptions that change the outcome. Apply the implementing rules in Chapter II of Annex VIII, and when several rules apply, the highest class applies. Confirm the final class with your notified body or regulatory specialist.

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How to use it

Start from the device's intended purpose, not its technology. Search for the rule groups that match: non-invasive, invasive, active, software or special rules. List every rule that could apply, read the full Annex VIII text for each candidate, and record the one that gives the highest class. Export the table to Excel and add a column for your rationale to keep as part of the classification record in the technical documentation.

Classify on intended purpose and duration of use
Check all potentially applicable rules
The highest resulting class wins
Record the rationale in the technical file

The structure of Annex VIII

Annex VIII has implementing rules followed by classification rules in four groups: non-invasive devices (rules 1 to 4), invasive devices (5 to 8), active devices (9 to 13) and special rules (14 to 22). Duration of use (transient, short-term, long-term), invasiveness, and whether a device is active or reusable are the main variables. Rule 11 for software is widely discussed because most diagnostic or decision software is now Class IIa or above.

Worked example

A reusable surgical instrument for transient use would be considered under Rule 6 and further conditions for reusable surgical instruments. A software application that gives dosing recommendations used to make therapeutic decisions falls under Rule 11 and the class rises with the severity of harm that wrong information could cause. A sterile wound dressing falls under Rule 4 and its class depends on the wound type.

Common mistakes

Frequent errors include classifying by analogy to a US product code, ignoring a rule because another one already applies, forgetting that accessories are classified in their own right, and not revisiting the classification after a change in intended purpose. Document the intended purpose precisely, because the class follows from it.

Frequently Asked Questions

Can I rely on this table to classify my device?

Use it as an orientation. The legal text of Annex VIII and MDCG guidance control the outcome, and a notified body can disagree with a self-assessment. Confirm borderline decisions with a regulatory specialist.

What if two rules apply?

The implementing rules state that where several rules apply to the same device, the strictest rule resulting in the higher classification applies. Record each candidate rule and why it did or did not drive the class.

How is software classified?

Rule 11 covers software intended to provide information for diagnostic or therapeutic decisions or to monitor physiological processes, with the class depending on the potential harm. Software that drives or influences a device follows the class of that device.

Does the class affect the CE marking route?

Yes. Class I (non-sterile, no measuring function, non-reusable surgical) is largely self-declared, while higher classes and Class I devices with sterile, measuring or reusable surgical features involve a notified body to varying degrees.

If you want device class, intended purpose and technical documentation status tracked next to your product master in the ERP, Netray can discuss how that could be set up.

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