Medical Device Grouping Strategy for Thailand Registrations

Can a single Thai registration cover multiple models? Yes, provided the grouping rules are satisfied. Thailand permits devices of all classes to be combined under a single registration, subject to three explicit general rules: the same proprietary / trade name, the same Product Owner, and the same common intended use.

1. Key takeaways

Grouping is one of the most financially consequential design decisions in a Thai registration project, because official fees are charged per application rather than per device. The essentials follow.

• Thailand allows devices of all classes to be merged under a single registration when three general rules are met: same proprietary/trade name, same Product Owner, same common intended use.
• Seven grouping types exist: Single, Family, System, Family of systems, IVD test kit, IVD cluster and Set, each with its own conditions as set out in the grouping guidance.
• Family grouping requires the same Product Owner, the same risk class, a common intended use, and common design and manufacturing processes, with differences limited to permitted variants such as size, length, diameter, colour, flexibility, storage capacity or sterilisation method.
• An IVD test kit covers reagents or articles used together for a specific diagnostic purpose under one kit name; analysers must be excluded and are normally handled as part of an IVD system; replacement reagents within the approved scope may be supplied separately.
• An IVD cluster requires the same manufacturer, all members at Thai Class 1 or Class 2, the same assay method and the same cluster category (Appendix 7 of the grouping guidance). Class 3/4 IVDs are not eligible.
• A Set packs two or more devices for a common procedure or purpose, and its classification is determined by the highest-risk component — bundling a low-risk main device with a high-risk accessory raises the whole package.
• The financial logic: Thai official fees are charged per application, not per device, so the more models that can lawfully be merged into one submission, the lower the unit cost. A Class 4 import application costs 74,000 baht whether it contains one model or ten, provided grouping rules are satisfied.

2. Legal basis

The grouping framework derives from the Thai FDA grouping guidance, which defines the seven grouping types and the three general rules, including the Appendix 7 cluster categories for IVD clusters. The Thai FDA document checklists provide for a List of Medical Devices and Grouping (in case of Grouped Medical Devices Application) wherever grouping is claimed. The fee logic — per application rather than per device — follows from the official fee schedule published on the Thai FDA website. The seven types and their conditions are summarised below.

3. Expert insights

The three most common grouping errors follow directly from the rules. First, merging across Product Owners: devices from different factories or under different brands cannot be combined, and corporate group structure is irrelevant to the regulator. Second, merging across risk classes: family grouping requires the same risk class, so a Class 2 variant cannot ride along in a Class 3 family. Third, putting the analyser inside an IVD test kit: analysers must be excluded and handled separately as part of an IVD system. Beyond these three, the Set rule deserves special vigilance: because a set is classified by its highest-risk component, packing a low-risk main device with a high-risk accessory lifts the entire package into the higher class, with all the fee, dossier and timeline consequences that follow.

The economic insight is equally direct. Because fees attach to the application rather than the device, grouping is the cheapest lever available for reducing unit registration cost — no foreign approval is needed, no pathway change is involved, and yet a tenfold increase in models under one certificate carries no additional official fee. The constraint is not economics but eligibility, which is why the grouping analysis belongs at the front of the project.

4. Practical recommendations

• Fix the grouping strategy before dossier compilation begins, not by working backwards once the model list is final.
• The correct sequence: map the product line by brand ownership, Product Owner, risk class and design/process commonalities; select the available grouping types; then compile the dossier by group.
• Reversing this order produces the classic failure: the dossier is written, only to reveal that models that should not have been merged were merged and models that should have been merged were split — forcing a full redo.
• Verify that every candidate family shares the same Product Owner and risk class before promising any fee savings internally.
• Keep analysers out of IVD test kits from the outset, and plan their separate treatment within an IVD system where needed.
• Model Set combinations carefully: identify the highest-risk component first, since it sets the class of the whole set.
• Confirm which models qualify as clusters against the Appendix 7 cluster categories before relying on cluster grouping for Class 1/2 IVDs.

5. Verification checklist

• □ Thai FDA grouping guidance (seven grouping types and three general rules)
• □ List of Medical Devices and Grouping (in case of Grouped Medical Devices Application) in the Thai FDA checklists
• □ IVD cluster eligibility: Class 1/2 restriction and the Appendix 7 cluster categories
• □ Rule that a Set is classified by its highest-risk component
• □ Thai FDA rule that official fees are charged per application, not per device

How GRZAN can help. GRZAN provides medical device and IVD registration, quality system, authorised representative and local testing support across Southeast Asia, including Thailand. Our team prepares dossiers to ASEAN CSDT structure, manages submissions and deficiency responses with the Thai FDA, and supports post-market vigilance obligations. Business enquiries: info@grzanglobal.com