Except as otherwise provided, to be eligible for State reimbursement, expenditures for public assistance, care and services, or for any other activity which is subject to reimbursement by the department, must be made within the time limits set forth in this section and must be included in a claim submitted by the social services district to the department for the time period in which such expenditures are claimed to have been made. (a) Claims for expenditures which are subject to reimbursement by