January 12, 2026

How Medical Devices Are Classified in Australia (and Why It Matters)

Medical device classification is one of the most foundational decisions in bringing a device to market. It determines what evidence you need, how your device is assessed, and the regulatory requirements you must meet. Because of its impact across the lifecycle of a device – from pre-market to post-market – classification deserves careful attention from day one.

What Is Medical Device Classification?

In Australia, the Therapeutic Goods Administration (TGA) uses a risk-based classification system to categorise medical devices and in vitro diagnostic (IVD) devices. The classification reflects the level of risk a device may pose to users or patients and determines the level of regulatory oversight required.

By law, manufacturers are responsible for accurately classifying their devices before they seek inclusion in the Australian Register of Therapeutic Goods (ARTG).

How Medical Devices Are Categorised

Non-IVD Medical Devices

Medical devices that are not IVDs are classified into the following risk tiers:

    • Class I – Low risk

    • Class IIa – Low-medium risk

    • Class IIb – Medium-high risk

    • Class III – High risk

Examples illustrate the risk tiers:

    • Class I: Surgical retractors, tongue depressors

    • Class IIa: Hypodermic needles, suction units, digital thermometers

    • Class IIb: Lung ventilators, blood bags

    • Class III: Heart valves, major joint implants

How is Medical Device Classification determined?

Medical devices are classified using rules set out in the Therapeutic Goods (Medical Devices) Regulations 2002 (the Regulations). These rules consider the device’s intended purpose and associated risks.

For active medical devices (including software), the TGA provides detailed guidance on classification, recognising that these devices depend on a source of energy – such as electrical or software-driven functions – and may pose greater risk.

Key principles include:

    • Each device function must be assessed against applicable classification rules.

    • If more than one rule applies, the device must be assigned the highest relevant class.

    • Software that drives or influences a device generally takes the same classification as the device itself.

This means that devices with multiple functions – for example, monitoring and diagnostic features – may be elevated to a higher risk category due to the increased responsibility they carry.

IVD Devices Have Different Classification Rules

IVDs – tests that examine human samples to assist diagnosis or patient management – follow a separate classification system. IVD classifications range from Class 1 IVD (lowest risk) up to Class 4 IVD (highest risk).

For IVDs, classification is driven by public health risk and personal risk if an incorrect result occurs. For example:

    • Class 1 IVD: Specimen receptacles or general instruments with minimal risk

    • Class 2 IVD: Low-to-moderate risk tests such as routine clinical chemistry or immunoassay tests

    • Class 3 IVD: Tests for conditions where misdiagnosis could result in serious outcomes

    • Class 4 IVD: High public health risk assays like blood donor HIV screening tests

Like non-IVD devices, the intended purpose (as stated in the instructions for use and marketing materials) drives classification – and higher-risk rules prevail when multiple rules could apply.

Why Classification Matters (Beyond a Label)

1. Determines Evidence and Regulatory Requirements

The class of your device dictates what regulatory evidence you must hold to support ARTG inclusion. Higher-risk classes typically require stronger conformity assessment evidence, including audits or more detailed technical documentation.

2. Impacts Time and Cost to Market

Incorrect classification can lead to:

    • Delays from reassessment or resubmission

    • Rework of technical documentation

    • Increased consulting and conformity assessment costs

Because TGA fees are not refundable if the wrong class is entered, classification errors can also directly increase regulatory expenses.

Common Classification Pitfalls

Getting classification wrong is easier than it seems – especially for complex or multifunctional devices. Common traps include:

    • Assuming classification from another jurisdiction applies to Australia

    • Overlooking software functions that elevate risk

    • Misinterpreting intended purpose based on marketing rather than clinical context

    • Failing to review classification after design changes

Because classification is tied to intended use, even small wording changes in labelling, IFU, or marketing can shift a device into a higher class.

When You Should Revisit Classification

You should reassess classification whenever:

    • Your intended use or claims change

    • New functionality or software updates are added

    • Device risk profile evolves based on clinical data

    • You expand into new indications or markets, even if outside Australia.

    • When applicable regulations are changed or updated

Classification isn’t a one-time decision – it’s a living regulatory determination that should align with how the device is developed, marketed, and used.

Conclusion

Medical device classification in Australia is a critical regulatory decision that shapes the entire compliance pathway. Getting classification right helps ensure you meet TGA requirements efficiently, avoid costly delays, and choose the right evidence strategy from the start.

Classification should always be based on the manufacturer’s intended purpose, applied consistently across your documentation, and reviewed whenever your device and/or the appliable regulations change.

If you’re unsure about which classification applies to your device, or if your device’s function has evolved, early regulatory advice can prevent missteps and accelerate your path to market.

Learn more about KD&A device classification services