Concerning high aggregate cost for long-term care service, I was covered under another health insurance society through March. Can I include the copayments I paid over that period in the aggregate total as well?

Yes, you can. In this case, you will need to apply to your previous health insurance society for issuance of a copayment certificate. When reimbursement is made for high aggregate cost for long-term care service, your previous health insurance society will reimburse the amount corresponding to the percentage of eligible copayments made under its coverage.