Medical device classification A, B, C, D: what importers must know

Every procedure for bringing a medical device into Vietnam starts with a single question: is the device class A, B, C or D. The classification result decides whether the company only declares applicable standards or must obtain a circulation registration number, sets the time to market and drives the intensity of post-market controls. Getting the class wrong at the outset is the most expensive compliance error in an importer’s chain.

Classification criteria: risk to patients and users

Decree 98/2021/ND-CP, as amended by Decree 07/2023/ND-CP, sorts medical devices into four risk tiers: class A devices carry low risk, class B medium-low, class C medium-high and class D the highest risk. Placement turns on intended purpose, how far the device invades the body, contact duration, how vital its function is, and the consequences if the device fails or returns a wrong result.

The same product family can land in different classes depending on the intended purpose the manufacturer declares. Imaging software used only for storage may sit in a low tier, while the same software used to support diagnosis of a serious condition is classed higher. Importers must therefore never copy the classification of a similar product already on the market; they must test the classification rules against the technical file and declared purpose of the exact device they import.

Procedural consequences of each class

Class A and B devices are managed through a declaration of applicable standards before circulation, a lighter procedure with faster market entry. Class C and D devices need a circulation registration number issued after the regulator appraises the dossier, with in vitro diagnostic devices and devices with a measuring function carrying additional requirements. The holder of the circulation number or declaration bears legal responsibility for the device on the Vietnamese market, even where another distributor physically imports the goods.

Misclassifying downward makes the entire circulation unlawful: the device is treated as circulated without a valid registration or declaration, exposing the company to product recall, administrative fines under the health sector penalty decree and possible suspension of imports. Misclassifying upward is legally safe but slows time to market and adds appraisal cost that was never needed.

Who may classify, and what the importer should do

Classification must be performed by an organisation qualified for medical device classification, and the classification result is filed with the declaration or registration dossier. Importers should obtain the manufacturer’s home-market classification and full technical documentation, then test both against Vietnam’s classification rules before signing exclusivity or placing volume orders.

A prudent practice is to revisit classification whenever the manufacturer changes the intended purpose, adds features or alters design in ways that affect risk. A device already lawfully circulated may still need reclassification and fresh procedures when a new version changes its risk profile, and continuing to sell the new version under the old circulation number is a recurring error among fast-growing distributors.

Frequently Asked Questions

What must importers know about device classes A, B, C, D?

Importers need four points: the A, B, C or D result decides whether circulation runs through a standards declaration or a registration number; classification follows risk and the manufacturer’s declared intended purpose; classification must be done by a qualified organisation; and the holder of the declaration or registration number bears legal responsibility in Vietnam even if it does not import the goods itself.

What criteria drive the classification?

Classification follows the device’s potential risk, assessed through intended purpose, invasiveness, duration of body contact, how vital the function is and the consequences of failure or a wrong result. Class A is the lowest risk and class D the highest under Decree 98/2021/ND-CP. The same product can change class if the manufacturer changes its declared intended purpose.

What happens if a device is misclassified?

Once detected, the device is treated as circulated without proper procedure: the company can be forced to recall units sold, face administrative fines in the health sector and suffer knock-on effects on later import procedures. Because a declaration or registration number granted on a wrong classification no longer protects the holder, the company usually has to redo the entire circulation procedure for that device.

Who has authority to classify devices?

Classification must be performed by an organisation meeting the conditions for medical device classification under Decree 98/2021/ND-CP, and the result is a mandatory component of the declaration or registration dossier. An importer does not conclude the class for its own device at will; it uses the qualified organisation’s result and remains responsible for checking that result against the actual technical file.

Bottom line for importers

The A, B, C, D classification is the first and most consequential compliance decision in the device import chain. Lock in a classification by a qualified organisation before making large commercial commitments, and revisit it whenever the device’s purpose or features change.