Do I have to provide employer access to medical records for workers' compensation claim?

Your medical records are confidential and an employer’s request for more information is generally only considered reasonable when it is required to determine, for example from a health and safety perspective, whether you are fit to return to work or to carry out moderated duties.

It could also be deemed reasonable in order to come to an agreed arrangement over who pays what for the damages you've incurred.

This is supported by state and national privacy laws which require that only as much information as required – and nothing more – is collected.

It would not be reasonable for the employer to request records of your full medical history.