For insurance networks other than the ones above, I can provide you a superbill that you can submit to your insurance carrier for reimbursement.
Reimbursement is entirely dependent on your insurance carrier and your plan. Not all plans include out of network benefits, and not all insurance companies offer out of network benefits at all. You are responsible for contacting your insurance company and finding out what out of network benefits your plan offers. You are also responsible for paying the full session fee at the time of session, and submitting your superbill to your insurance company for reimbursement. Your insurance company will reimburse you directly.
Many insurance plans provide out of network coverage, with partial coverage of fees. Not all insurance plans provide this (for example, Kaiser will not) so check your individual plan for out of network mental health coverage.
Sliding scale may or may not be available for clients using out of network insurance, depending on coverage and affordability.