About this work
What does the policy definition actually decide?
Almost everything. There is no statutory test of disability in this area, so entitlement is measured against words the insurer drafted, and those words differ between policies in ways that change outcomes.
The common structure is two stages. For an initial period, often around the first two years of benefits, the test is whether you can perform the essential duties of your own occupation. After that the test usually changes to whether you can perform the duties of any occupation for which you are reasonably suited by education, training or experience.
That switch is where a great many claims are terminated, and it is predictable. A claimant receiving benefits under an own occupation test should know the date the definition changes, because the evidence needed to hold the claim after it is different and takes time to build.
Any occupation does not mean any job at all. It is qualified by suitability and, in most wordings, by a comparable level of earnings. A surgeon is not expected to take work as a greeter, and the argument about what counts as reasonably suited is a real one.