Physios and Chiros are very different.
A Chiro is focused on a realignment or adjustment of joints.
Physio looks at muscular and joint pain but works on release and mobilising - the massage, stretches, heat, US etc but particularly exercises to build strength and prevent reoccurrence. They're also more inclined to look at the bigger picture and treat the cause not just the symptoms. I see mine to treat knee pain initially so I use it properly and then move to the actual cause which is in my glutes.
Lucky getting the bulk billing - must have had acute trauma, non extension and diagnosis of ??acute tear. That's the only way you get them for knees!