Seller Guardrails · EU MDR Annex VIII
Classify your medical device against MDR Annex VIII
Answer the device intake; watch Annex VIII rules 1–22 resolve on the right. Each applying rule cites its Annex excerpt and contributes to the highest class. The final seal carries the notified-body route + UK/CH equivalents.
MDR Annex VIII rule corpus verified 2026-06-16. Cross-check EUR-Lex + MDCG 2021-24 before filing your Declaration of Conformity.
Fill the device intake on the left; each Annex VIII rule will resolve here.
Provide device characteristics to compute the class.
- Risk classes
- 4 I · IIa · IIb · III (Annex VIII)
- Annex VIII rules
- 22 Rules 1–22; highest class governs
- Markets stamped
- 4 EU · EEA · UK · CH routes
How is a medical device classified under EU MDR Annex VIII?
The EU Medical Device Regulation (Regulation (EU) 2017/745, applying since 26 May 2021) assigns every device to Class I, IIa, IIb or III using the 22 rules in Annex VIII, based on duration of use, invasiveness, whether the device is active, and special characteristics. When more than one rule applies, the strictest rule giving the highest class governs. Class I devices (non-sterile, non-measuring, non-reusable-surgical) are self-declared; Class IIa, IIb and III require a notified body.
The deciding factors are duration of use (transient / short-term / long-term), invasiveness (non-invasive, body-orifice, surgically invasive, implantable), whether the device is active, and any special characteristics in Rules 14–22. Annex VIII §3.5 then takes the highest class any applying rule gives. → Walk your device through Rules 1–22 in the tool above to see which rules apply and the resulting class.
Legacy devices with a valid CE certificate benefit from the Reg (EU) 2023/607 transition: Class III devices and Class IIb implantable legacy devices may stay on the market until 31 December 2027 — except certain well-established Class IIb implantables (sutures, staples, dental fillings, dental braces, tooth crowns, screws, wedges, plates, wires, pins, clips and connectors), which instead have until 31 December 2028 — and other Class IIb, Class IIa and Class I sterile/measuring devices until 31 December 2028, subject to conditions. This tool walks Annex VIII rules 1–22 against your device intake and returns the class, the conformity-assessment route, and UK and Swiss equivalents — it is decision support, not legal advice, and MDR Art. 51 places classification responsibility on the manufacturer.
Sources: Regulation (EU) 2017/745 (MDR) Annex VIII — EUR-Lex (applies 26 May 2021) · MDCG 2021-24 Rev.1 — Guidance on classification of medical devices (European Commission) · Regulation (EU) 2023/607 Art. 120 — legacy-device transition (31 Dec 2027 / 31 Dec 2028)
This tool is decision support, not legal advice. MDR Art. 51 places classification responsibility on the manufacturer. The Annex VIII rule corpus is refreshed quarterly; the dataset_pin date is the last verification against EUR-Lex + MDCG 2021-24. For Class IIa/IIb/III devices you must engage a notified body before placing the device on the EU market.
EU MDR classification — frequent questions
What are the device classes under EU MDR?
Regulation (EU) 2017/745 has four risk classes: Class I (low risk, e.g. most non-invasive devices), Class IIa (medium-low), Class IIb (medium-high) and Class III (high risk, e.g. active implantables and devices in contact with the heart or central nervous system). Class I devices that are supplied sterile, have a measuring function, or are reusable surgical instruments form a sub-group (often written I*) that needs notified-body involvement limited to those aspects. The class drives which conformity-assessment route under Annex IX, X or XI you must follow.
When does a medical device need a notified body?
Self-declaration (the manufacturer's own Declaration of Conformity) is only permitted for plain Class I devices. Class I sterile / measuring / reusable-surgical, and all Class IIa, IIb and III devices, require a notified body. The depth of assessment increases with class: Class III requires Annex IX Chapter II design-dossier examination on top of the quality-management-system audit. Engaging a notified body early matters because notified-body capacity under MDR is constrained.
How does Rule 11 classify medical device software (MDSW)?
Annex VIII Rule 11 (read with MDCG 2019-11) classifies standalone software by the significance of the information it provides. Software for diagnostic or therapeutic decisions is Class IIa; it rises to Class IIb if those decisions may cause serious deterioration of health or surgical intervention, and to Class III if they may cause death or an irreversible deterioration. Software that monitors vital physiological parameters where variations could create immediate danger is Class IIb. All other software is Class I. Misjudging Rule 11 is the most common SaMD compliance error.
Why is an active implantable device Class III and not Class IIb?
Rule 8 makes implantable and long-term surgically invasive devices Class IIb as a baseline, but it lists seven exceptions that escalate to Class III. Active implantable devices and their accessories are one of them — so a pacemaker, implantable defibrillator or neurostimulator is Class III, not IIb. The other Class III triggers under Rule 8 include direct contact with the heart, central circulatory system or central nervous system; a biological effect or being wholly or mainly absorbed; chemical change in the body; administering a medicinal product; and breast implants, surgical meshes, and joint or spinal-disc replacements.
What are the MDR transition deadlines for legacy devices?
Regulation (EU) 2023/607 extended the Art. 120 transition for devices that held a valid certificate or Declaration of Conformity under the old directives. Class III devices and Class IIb implantable legacy devices can remain on the market until 31 December 2027 — except certain well-established Class IIb implantables (sutures, staples, dental fillings, dental braces, tooth crowns, screws, wedges, plates, wires, pins, clips and connectors), which instead have until 31 December 2028; other Class IIb, Class IIa and Class I sterile/measuring devices until 31 December 2028. The extension is conditional — the manufacturer must, among other things, have a compliant quality-management system and have lodged an application with a notified body by the relevant cut-off. It does not change the device's classification, only the timeline to obtain an MDR certificate.
Does the EU classification apply in the UK and Switzerland?
Not automatically. Great Britain currently accepts CE-marked EU MDR devices until 30 June 2030 (MDD/AIMDD legacy devices until 30 June 2028), but the UKCA route uses the UK MDR 2002, which follows the old MDD classification rules and has no software Rule 11 — so a software class can diverge. Switzerland's EU–CH mutual recognition agreement lapsed, so a Swiss Authorised Representative (CH-REP) is required and Switzerland cannot be treated as EU-equivalent. This tool stamps UK and Swiss routes separately rather than copying the EU verdict blindly.
Is this classification legally binding?
No. MDR Art. 51 places the classification decision on the manufacturer, and where the manufacturer and notified body disagree the competent authority decides. This tool is a deterministic decision-support estimate that walks Annex VIII and cites MDCG 2021-24; it does not model every sub-clause of every rule and carries a last-verified date that pauses the verdict when the dataset goes stale. Cross-check the result against the live EUR-Lex text and MDCG 2021-24, and confirm borderline cases with your notified body before filing your Declaration of Conformity.