Insurance claims administration; insurance claims processing; health transaction clearinghouse services, management of revenue and expense transactions for providers of health and medical products and services; online services for health care practitioners, namely, providing transaction services to health care practitioners via an online computer network, namely, insurance eligibility and verification, referral authorizations; insurance brokerage; administration, financial management and maintenance of health savings accounts, medical savings accounts, health reimbursement arrangements and flexible spending accounts; accounts receivable (AR) management; denied claim management; and patient financial services (PFS) consulting